0001842279-24-000012 | 10-K | XBRL Viewer

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Derivative Financial Instruments and Fair Value Measurements - Summary of Commodity Swaps (Details)	24 Months Ended
	Dec. 31, 2024 MWh	Nov. 17, 2022 uSD_per_Megawatt-Hour	Oct. 17, 2022 uSD_per_Megawatt-Hour
Commodity Contract, Contract One
Derivative [Line Items]
Average Contract Price (per MWh) \| uSD_per_Megawatt-Hour			68.50
Commodity Contract, Contract One \| Forecast
Derivative [Line Items]
Notional Quantity per Year (“MWh”) \| MWh	70,176
Commodity Contract, Contract Two
Derivative [Line Items]
Average Contract Price (per MWh) \| uSD_per_Megawatt-Hour			65.50
Commodity Contract, Contract Two \| Forecast
Derivative [Line Items]
Notional Quantity per Year (“MWh”) \| MWh	26,280
Commodity Contract, Contract Three
Derivative [Line Items]
Average Contract Price (per MWh) \| uSD_per_Megawatt-Hour		81.50
Commodity Contract, Contract Three \| Forecast
Derivative [Line Items]
Notional Quantity per Year (“MWh”) \| MWh	35,088

Variable Interest Entities - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) variable_interest_entity	Sep. 14, 2023	May 30, 2023	May 29, 2023 variable_interest_entity	Dec. 31, 2022 variable_interest_entity
Variable Interest Entity [Line Items]
Number of variable interest entities	7
Number of variable interest entities consolidated	2			2	4
Paragon
Variable Interest Entity [Line Items]
Percentage of ownership	50.00%		50.00%
Paragon \| Emerald And Sapphire
Variable Interest Entity [Line Items]
Percentage of ownership transferred			50.00%
OPAL L2G
Variable Interest Entity [Line Items]
Percentage of ownership		50.00%
SJI
Variable Interest Entity [Line Items]
Percentage of ownership	50.00%	50.00%
SJI \| RNG Atlantic
Variable Interest Entity [Line Items]
Contributions to project subsidiary \| $	$ 2,115

Goodwill

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

The following table summarizes the changes in goodwill, if any, by reporting segment from the beginning of the period to the end of the period:


	RNG Fuel		Fuel Station Services		Total
Balance at December 31, 2023	$	51,155	$	3,453	$	54,608
Balance at December 31, 2022	$	51,155	$	3,453	$	54,608

Goodwill (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 54,608
Goodwill, ending balance	54,608
RNG Fuel
Goodwill [Roll Forward]
Goodwill, beginning balance	51,155
Goodwill, ending balance	51,155
Fuel Station Services
Goodwill [Roll Forward]
Goodwill, beginning balance	3,453
Goodwill, ending balance	$ 3,453

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References + Details

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Basis of Presentation and Principles of Consolidation

These consolidated financial statements are prepared in accordance with generally accepted accounting principles in the United States ("U.S. GAAP") and includes the accounts of the Company and all other entities in which the Company has a controlling financial interest: OPAL Renewable Power LLC (formerly Fortistar Methane 3 LLC (“FM3”) and Fortistar Methane 4 LLC), Beacon RNG LLC (“Beacon”) Sunoma Holdings, LLC (“Sunoma”), New River LLC (“New River”), Reynolds RNG LLC (“Reynolds”), Central Valley LLC (“Central Valley”), Prince William RNG LLC (“Prince William”), Cottonwood RNG LLC, Polk County RNG LLC (“Polk County”), OPAL Contracting LLC (formerly Fortistar Contracting LLC), OPAL RNG LLC (formerly Fortistar RNG LLC), and OPAL Fuel station services LLC (“Fuel Station Services”). The Company’s unaudited consolidated financial statements include the assets and liabilities of these subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. The non-controlling interest attributable to the Company's variable interest entities ("VIE") are presented as a separate component from the Stockholders' deficit in the consolidated balance sheets and as a non-redeemable non-controlling interests in the consolidated statements of changes in redeemable non-controlling interests, redeemable preferred non-controlling interests and Stockholders' (deficit) equity.

Certain prior period amounts have been reclassified to conform with the current period presentation including reclassification of the Company’s proportional share of income in equity investments into operating income. See Note 3. Investment in Other Entities for further discussion. The Company reclassified certain project development and start up costs as a separate line within Operating expenses, which were previously included in Cost of sales - RNG Fuel and Selling, general and administrative expenses. Please see the Project development and start up costs section within Note 2. Additionally, the Company also reclassified certain Accounts Payable to equity method investments from Accounts Payable to Accounts payable, related party. Please see Note 10. Related Parties for additional information.

Variable Interest Entities

Our policy is to consolidate all entities that we control by ownership of a majority of the outstanding voting stock. In addition, we consolidate entities that meet the definition of a variable interest entity (“VIE”) for which we are the primary beneficiary. The Company applies the VIE model from ASC 810 when the Company has a variable interest in a legal entity not subject to a scope exception and the entity meets any of the five characteristics of a VIE. The primary beneficiary of a VIE is considered to be the party that both possesses the power to direct the activities of the entity that most significantly impact the entity’s economic performance and has the obligation to absorb losses or the rights to receive benefits of the VIE that could be significant to the VIE. To the extent a VIE is not consolidated, the Company evaluates its interest for application of the equity method of accounting. Equity method investments are included in the consolidated

balance sheets as “Investments in other entities.” Investments in unconsolidated entities in which the Company has influence over the operating or financial decisions are accounted for under the equity method.

We determine whether we are the primary beneficiary of a VIE upon our initial involvement with the VIE and we reassess whether we are the primary beneficiary of a VIE on an ongoing basis. Our determination of whether we are the primary beneficiary of a VIE is based upon the facts and circumstances for each VIE and requires judgment. Our considerations in determining the VIE's most significant activities and whether we have power to direct those activities include, but are not limited to, the VIE's purpose and design and the risks passed through to investors, the voting interests of the VIE, management, service and/or other agreements of the VIE, involvement in the VIE's initial design, and the existence of explicit or implicit financial guarantees. If we are the party with the power over the most significant activities, we meet the "power" criteria of the primary beneficiary. If we do not have the power over the most significant activities or we determine that all significant decisions require consent of a third party, we do not meet the "power" criteria of the primary beneficiary.

We assess our variable interests in a VIE both individually and in aggregate to determine whether we have an obligation to absorb losses of or a right to receive benefits from the VIE that could potentially be significant to the VIE. The determination of whether our variable interest is significant to the VIE requires judgment. In determining the significance of our variable interest, we consider the terms, characteristics and size of the variable interests, the design and characteristics of the VIE, our involvement in the VIE, and our market-making activities related to the variable interests.

Use of estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The significant estimates and assumptions of the Company include the residual value of the useful lives of our property, plant and equipment, the fair value of stock-based compensation, asset retirement obligations, the estimated losses on our trade receivables, percentage completion for revenue recognition, incremental borrowing rate for calculating the right-of-use assets and lease liabilities, the impairment assessment of goodwill, the fair value of deconsolidated VIEs and the fair value of derivative instruments. Actual results could differ from those estimates.

Accounting Pronouncements Adopted and Accounting Pronouncements Not Yet Adopted

Accounting Pronouncements Adopted

In June 2016, the Financial Standards Accounting Board ("FASB") issued ASU 2016-13, Financial Instruments — Credit Losses ("ASC 326"), with the objective of providing information about the credit risk inherent in an entity’s financial statements as well as to explain management’s estimate of expected credit losses and the changes in the allowance for such losses. The accounting standard amends the current financial instrument impairment model by requiring entities to use a forward-looking approach based on expected losses to estimate credit losses on certain types of financial instruments, including trade receivables. Under the new guidance, an entity recognizes as an allowance, its estimate of lifetime expected credit losses, which will result in more timely recognition of such losses. The Company adopted the accounting standard using the modified retrospective transition approach as of January 1, 2023. There was no cumulative effect upon adoption to report to our consolidated financial statements.

The adoption of ASC 326 primarily impacted our trade receivables and the Note receivable - variable fee component recorded on our consolidated balance sheet as of December 31, 2023. Upon adoption of ASC 326, the Company assessed collectability by reviewing accounts receivable on a collective basis where similar characteristics exist and on an individual basis when we identify specific customers with known disputes or collectability issues. In determining the amount of the allowance for credit losses, the Company considered historical collectability based on past due status and made judgments about the creditworthiness of customers based on ongoing credit evaluations. The Company also considered customer-specific information, current market conditions and reasonable and supportable forecasts of future economic conditions to inform adjustments to historical loss data. The carrying value of the Note receivable - variable fee component on the consolidated balance sheet as of December 31, 2023 is based on a discounted expected cash flows model which is adjusted on a quarterly basis. Therefore, the Company determined that the credit risk component is included in the carrying value at each reporting period. The adoption of ASC 326 did not have any material impact on our consolidated financial statements.

Accounting Pronouncements Not Yet Adopted

In March 2023, the FASB issued Accounting Standards Update No. 2023-01, Leases (Topic 842) (the "Update"). The Update requires the entities to classify and account for a leasing arrangement between entities under common control on the same basis as an arrangement with an unrelated party. The Update also requires that leasehold improvements associated with common control leases be amortized by the lessee over the useful life of the leasehold improvements to the common control group (regardless of the lease term) as long as the lessee controls the use of the underlying asset and accounts for the underlying asset as a transfer between entities under common control through an adjustment to equity if and when the lessee no longer controls the use of the underlying asset. The amendments in this Update are effective for fiscal years beginning after December 15, 2023 including interim fiscal periods within those fiscal years. The Company is currently evaluating the impact of the adoption of this Update on its consolidated financial statements.

In August 2023, the FASB issued Accounting Standards Update No. 2023-05, Business Combinations- Joint Venture Formations (Subtopic 805-60) ("ASU 2023-05"). The update requires all joint ventures formed after January 1, 2025, upon formation, to apply a new basis of accounting and initially measure its assets and liabilities at fair value. ASU 2023-05 is effective prospectively for joint ventures with a formation date on or after January 1, 2025. The Company is currently evaluating the impact of the adoption of ASU 2023-05 on its consolidated financial statements.

In October 2023, the FASB issued Accounting Standards Update No. 2023-06, Disclosure Improvements - Codification Amendments in response to SEC's Disclosure Update and Simplification Initiative ("ASU 2023-06).The update requires certain additional disclosures including but not limited to accounting policy on relating to cash flows associated with derivative instruments and their related gains and losses in statement of cash flows, methods used in the diluted earnings per share computation for each dilutive security, disclosures related to assets mortgaged, pledged or otherwise subject to lien and collateralized obligations, disclosure of amounts and terms of unused lines of credit, unfunded commitments, weighted average interest rate on short-term borrowings, preference of preferred stock in an involuntary liquidation if the liquidation preference is other than par or stated value and disclosure of amounts at risk with an individual counterparty if the amount exceeds 10% of stockholder's equity. The Company is currently evaluating the impact of the adoption of ASU 2023-06 on its consolidated financial statements.

In November 2023, the FASB issued Accounting Standards Update No. 2023-07, Segment Reporting (Topic 280) ("ASU 2023-07"). The update improves the reportable segment disclosure requirements by requiring all entities to disclose significant segment expenses that are regularly provided to the chief operating decision maker (CODM), report other segment items ( segment revenue less the significant expenses disclosed and profit or loss) by reportable segment, title and

position of the CODM and an explanation of how the CODM uses the reported measure of segment profit or loss in assessing segment performance and deciding how to allocate resources. Additionally, ASU 2023-07 requires that if the CODM uses more than one measure of a segment's net income or loss in assessing segment performance and deciding how to allocate resources, the entity may report one or more of those additional measures. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024 and should be applied retrospectively for all periods presented. The Company is currently evaluating the impact of the adoption of ASU 2023-07 on its consolidated financial statements.

Short term investments

The Company considers highly liquid investments such as time deposits and certificates of deposit with an original maturity greater than three months at the time of purchase to be short term investments. The short term investments of $9,875 consists of cash invested in money market accounts with maturities ranging between 1 and 12 months as of December 31, 2023. The amounts in these money market accounts are liquid and available for general use.

Our short term investments are generally invested in commercial paper issued by highly credit worthy counter parties and government backed treasury bills. Investments are generally not FDIC insured and we take counter party risk on these investments.

Earnout Awards

In connection with the Business Combination completed in July 2022 and pursuant to a sponsor letter agreement, the Sponsor agreed to subject 10% of its Class A common stock (received as a result of the conversion of its ArcLight Class B

ordinary shares immediately prior to the closing) to vesting and forfeiture conditions relating to VWAP targets for the Company's Class A common stock sustained over a period of 60 months following the closing. OPAL Fuels equity holders are eligible to receive an aggregate of 10,000,000 shares of Class B and Class D common stock upon the Company achieving each earn-out event during the earn-out period. The earnout awards (the "Earnout Awards") were recognized at fair value on the closing date and classified as a liability which is remeasured at each balance sheet date and any change in fair value is recognized in the Company's consolidated statement of operations as part of change in fair value of derivative instruments, net.

Redeemable non-controlling interests

Redeemable non-controlling interests represent the portion of OPAL Fuels that the Company controls and consolidates but does not own. The Redeemable non-controlling interest was created as a result of the Business Combination and represents 144,399,037 Class B Units issued by OPAL Fuels to the prior investors. The Company allocates net income or loss attributable to Redeemable non-controlling interest based on weighted average ownership interest during the period. The net income or loss attributable to Redeemable non-controlling interests is reflected in the consolidated statement of operations.

At each balance sheet date, the mezzanine equity classified Redeemable non-controlling interests is adjusted up to their maximum redemption value if necessary, with an offset in Stockholders' equity.

Stock-based compensation

The Company issues stock-based compensation utilizing stock options, performance units and restricted stock units. In accordance with ASC 718, Stock Compensation, ("ASC 718"), stock-based compensation is measured at the fair value of the award at the date of grant and recognized over the period of vesting on a straight-line basis using the graded vesting method. The grant-date fair value of stock options is estimated using the Black-Scholes option pricing model. Expense for stock-based compensation awards that include performance conditions are initially calculated and subsequently remeasured based on the outcome deemed probable of occurring, and recognized over the vesting period, with the ultimate amount of expense recognized based on the actual performance outcome. Please see Note 16. Stock-based Compensation, for additional information. Forfeitures are recognized as they occur.

Project development and start up costs

The Company has multiple RNG projects under construction for which the Company incurs certain development costs such as legal, consulting fees for joint venture structuring, royalties to the landfill owner, fines, settlements, site lease expenses and certification costs. Additionally, the Company also incurs certain expenses on new RNG projects that started operating for the first two years such as virtual pipeline costs (trucking costs incurred until a physical pipeline is connected) and ramp up costs. These costs are temporary and non-recurring over the project lifetime. Historically, the Company included these expenses in Cost of sales - RNG Fuel and Selling, general and administrative expenses with no associated revenues. For the years ended December 31, 2023 and 2022, the Company is presenting these expenses in a separate line within operating expenses to provide additional information to the readers of the financial statements regarding the ongoing profitability of our RNG projects in operation.

Net income per share

The Business Combination was accounted for as a reverse recapitalization as OPAL Fuels was determined to be the accounting acquirer under FASB ASC Topic 805, Business Combinations. Accordingly, for accounting purposes, the transaction is treated as the equivalent of OPAL Fuels issuing stock for the net assets of ArcLight, accompanied by a recapitalization.

The Company's basic earnings per share of Class A common stock is computed based on the average number of outstanding shares of Class A common stock for the period.

The Company's diluted earnings per share includes effects of the Company's outstanding Redeemable non-controlling interests (OPAL Fuels Class B units), Restricted Stock Units, the put option a forward purchase agreement, redeemable preferred non-controlling interests, Sponsor Earnout Awards and OPAL Earnout Awards.

Accounts Receivable, Net

Accounts receivable represent amounts due from the sale of RNG, natural gas, gas transportation, construction contracts, service contracts, environmental attributes, electricity, capacity, and LFG. The accounts receivable are the net estimate realizable value between the invoiced accounts receivable and allowance for credit losses. Upon adoption of ASC 326, the Company assesses collectability by reviewing accounts receivable on a collective basis where similar characteristics exist and on an individual basis when we identify specific customers with known disputes or collectability issues. In determining the amount of the allowance for credit losses, the Company considers historical collectability based

on past due status and made judgments about the creditworthiness of customers based on ongoing credit evaluations. The Company also considers customer-specific information, current market conditions and reasonable and supportable forecasts of future economic conditions to inform adjustments to historical loss data.

Asset Retirement Obligation

The Company accounts for asset retirement obligations in accordance with FASB ASC 410, Asset Retirement and Environmental Obligations, which requires entities to record the fair value of a liability for an asset retirement obligation in the period in which it is incurred and when a reasonable estimate of fair value can be made. The fair value of the estimated asset retirement obligations is recorded as a long-term liability, with a corresponding increase in the carrying amount of the related asset. The discounted asset retirement costs capitalized amount are accreted over the life of the sublease or site lease agreement. Asset retirement obligations are deemed Level 3 fair value measurements as the inputs used to measure the fair value are unobservable. The Company estimates the fair value of asset retirement obligations by calculating the estimated present value of the cost to retire the asset. This estimate requires assumptions and judgments regarding the existence of liabilities, the amount and timing of cash outflows required to settle the liability, inflation factors, credit adjusted discount rates, and consideration of changes in legal, regulatory, environmental, and political environments. In addition, the Company determines the Level 3 fair value measurements based on historical information and current market conditions.

Revenue Recognition

The Company’s revenue arrangements generally consist of a single performance obligation to transfer goods or services. Revenue from the sale of RNG, CNG and, electricity is recognized by applying the “right to invoice” practical expedient within the accounting guidance for Revenue from Contracts with Customers that allows for the recognition of revenue from performance obligations in the amount of consideration to which there is a right to invoice the customer and when the amount for which there is a right to invoice corresponds directly to the value transferred to the customer. For some public CNG Fueling Stations where there is no contract with the customer, the Company recognizes revenue at the point in time that the customer takes control of the fuel.

The Company also performs maintenance services throughout the country. Maintenance consists of monitoring equipment and replacing parts as necessary to ensure optimum performance. Revenue from service agreements is

recognized over time as services are provided. Capacity payments fluctuate based on peak times of the year and revenues from capacity payments are recognized monthly as earned.

The Company has agreements with two natural gas producers ("Producers") to transport Producers' natural gas using the Company's RNG gathering system. The performance obligation is the delivery of Producers' natural gas to an agreed delivery point on an interstate gas pipeline. The quantity of natural gas transported for the Producers is measured at a certain specified meter. The price is fixed at contracted rates and the Producers pay approximately 30 days after month-end. As such, transportation sales are recognized over time, using the output method to measure progress.

The Company provides credit monetization services to customers that own renewable gas generation facilities. The Company recognizes revenue from these services as the credits are minted on behalf of the customer. The Company receives non-cash consideration in the form of RINs or LCFSs for providing these services and recognizes the RINs or LCFSs received as Environmental credits held for sale within current assets based on their estimated fair value at contract inception. When the Company receives RINs or LCFSs as payment for providing credit monetization services, it records the non-cash consideration in inventory based on the fair value of RINs or LCFSs at contract commencement.

On November 29, 2021, the Company entered into a purchase and sale agreement with NextEra, a related party, for the environmental attributes generated by the RNG Fuels business. Under this agreement, the Company is committed to sell a minimum of 90% of the environmental attributes generated and will receive net proceeds based on the agreed upon price less a specified discount. A specified volume of environmental attributes sold per quarter will incur a discount fee per environmental attribute in addition to the specified discount. The agreement was effective beginning January 1, 2022. For the years ended December 31, 2023 and 2022, the Company earned net revenues after discount and fees of $56,069 and $58,185, respectively, under this contract which was recorded as part of Revenues - RNG Fuel. For the years ended December 31, 2023 and 2022, the Company earned net revenues after discount and fees of $28,468 and $18,735, respectively, which was recorded as part of Revenues - Fuel Station Services.

During third and fourth quarter of 2022, two of the wholly-owned subsidiaries from our Renewable Power portfolio entered into a purchase and sale agreement with an environmental attribute marketing firm to sell environmental attributes associated with renewable biomethane ("ISCC Carbon Credits") and purchase brown gas back at contracted fixed prices per million British thermal units ("MMbtu"). One of these contracts has a term of 3-years from the date of certification of the facility with an auto-renewal option. The other contract was terminated in August 2023. During the third quarter of 2023, three additional Renewable Power facilities entered into purchase and sale agreements with 3 year terms and similar terms and conditions as the previous contracts. For the years ended December 31, 2023 and 2022, the Company earned net revenues of $16,325 and $3,114, respectively under this contract which were recorded as part of Revenues - Renewable Power in the consolidated statement of operations.

Sales of Environmental Attributes such as RINs, renewable energy credits ("RECs"), ISCC Carbon Credits and LCFS are generally recorded as revenue when the certificates related to them are delivered to a buyer. However, the Company may recognize revenue from the sale of such Environmental Attributes at the time of the related renewable power sales when the contract provides that title to the Environmental Attributes transfers at the time of production, the Company's price to the buyer is fixed, and collection of the sales proceeds is certain.

Management operating fees are earned for the operation, maintenance, and repair of the gas collection system of a landfill site. Revenue is calculated on the volume of per million British thermal units of LFG collected and the megawatt hours ("MWhs") produced at that site. This revenue is recognized when LFG is collected and renewable power is delivered.

The Company has various fixed price contracts for the construction of Fueling Stations for customers. Revenues from these contracts, including change orders, are recognized over time, with progress measured by the percentage of costs incurred to date compared to estimated total costs for each contract. This method is used as management considers costs incurred to be the best available measure of progress on these contracts. Costs capitalized to fulfill certain contracts were not material in any of the periods presented.

The Company owns Fueling Stations for use by customers under fuel sale agreements. The Company bills these customers at an agreed upon price for each gallon sold and recognizes revenue based on the amounts invoiced in accordance with the "right to invoice" practical expedient. For some public stations where there is no contract with the customer, the Company recognizes revenue at the point-in-time that the customer takes control of the fuel.

The Company from time-to-time enters into fuel purchase agreements with customers whereby the Company is contracted to design and build a Fueling Station on the customer's property in exchange for the Company providing CNG/RNG to the customer for a determined number of years. In accordance with the standards of ASC 840, Leases, the Company has concluded these agreements meet the criteria for a lease and are classified as operating leases. Typically, these agreements do not require any minimum consumption amounts and, therefore, no minimum payments. Upon adoption of ASC 842, the Company adopted the practical expedient not to reassess the classification. For additional information on lease revenues earned, please see Note 8. Leases.

Contract Assets and Contract Liabilities

Contract Assets

Contract assets consist primarily of costs and estimated earnings in excess of billings and retainage receivables. Costs and estimated earnings in excess of billings represent unbilled amounts earned and reimbursable under construction contracts and arise when revenues have been recognized but amounts are conditional and have yet to be billed under the terms of the contract. Included in costs and estimated earnings in excess of billings are amounts the Company will collect from customers, changes in contract specifications or design, costs associated with contract change orders in dispute or unapproved as to scope or price, or other customer-related causes of unanticipated contract costs. Amounts become billable according to contract terms, which consider the progress on the contracts as well as achievement of certain milestones and completion of specified units of work. Except for claims, such amounts will be billed over the remaining life of the contract.

Contract Liabilities

Contract liabilities consist of billings in excess of costs and estimated earnings, other deferred construction revenue and general provisions for losses, if any. Billings in excess of costs and estimated earnings represent cash collected from customers and billings to customers in advance of work performed. Such unearned project-related costs will be incurred over the remaining life of the contract.

Parts Inventory

Parts inventory, also referred to as supplies inventory, consists of shop spare parts inventory and construction site parts inventory. Inventory is stated at the lower of cost or net realizable value. The substantial amount of inventory is identified, tracked and treated as finished goods. An annual review of inventory is performed to identify obsolete items.

Capital Spares

Capital spares consist primarily of large replacement parts and components for the RNG facilities and power plants. These parts, which are vital to the continued operation of the RNG facilities and power plants and require a substantial lead time to acquire, are maintained on hand for emergency replacement. Capital spares are recorded at cost and

expensed when placed into service as part of a routine maintenance project or capitalized when part of a plant improvement project.

Property, Plant and Equipment, net

Property, Plant, and Equipment, net

Property, plant, and equipment are recorded at cost, except for the portion related to asset retirement obligations, which are recorded at estimated fair value at the time of inception. Direct costs related to the construction of assets and renewals and betterments that materially improve or extend the life of the assets are capitalized. Additionally, any interest expense incurred on any outstanding construction loans such as interest on our Sunoma loan is capitalized to the specific project. Replacements, maintenance, and repairs that do not improve or extend the life of the respective assets are expensed as incurred. Depreciation is computed using the straight-line method over the estimated useful lives of the assets as follows:


Plant and equipment						5 - 30 years
CNG/RNG fueling stations						10-20 years
Construction in progress						N/A
Buildings						40 years
Land						N/A
Service equipment						5-10 years
Leasehold improvements						shorter of lease term or useful life
Vehicles						7 years
Office furniture and equipment						5-7 years
Computer software						3 years
Land lease - finance lease						Lease term
Vehicles - finance lease						shorter of lease term or useful life
Other						7 years

When plant and equipment are retired or otherwise disposed of, the related cost and accumulated depreciation or amortization is removed, and a gain or loss is recognized in the consolidated statements of operations. The Company capitalizes costs related to the development and construction of new projects when there is a significant likelihood that the project will be constructed for its intended use. This is determined based on the attainment of certain milestones, including, but not limited to, the receipt of permits; final negotiation of major contracts including gas rights agreements, gas transportation and engineering, procurement and construction contracts. Costs incurred prior to this time are expensed. Additionally, the Company capitalizes any interest incurred on its generic borrowings during the construction phase until the project becomes operational.

Deferred financing costs

Fees incurred for obtaining new loans or debt restructuring are deferred and amortized to interest expense over the life of the related debt using effective interest method. Unamortized financing costs are written off when the related debt is extinguished. Deferred financing costs (or debt issuance costs) are reported as a reduction of the carrying value of the long-term debt in the consolidated balance sheets.

Environmental credits held for sale

The Company provides credit monetization services to customers that own renewable gas generation facilities. The Company recognizes revenue from these services as the credits are minted on behalf of the customer. The Company receives non-cash consideration in the form of RINs or LCFSs for providing these services and recognizes the environmental credits received as part of Revenues - Fuel Station Services and Environmental credits held for sale within current assets based on their estimated fair value at contract inception. It is recorded at historical fair value at contract inception and adjusted to its net realizable value at each balance sheet date. Due to the historically higher LCFS pricing, the

fair value at contract inception may be significantly higher than the net realizable value of the environmental credits generated.

Major Maintenance

Major maintenance is a component of maintenance expense and encompasses overhauls of internal combustion engines, gas compressors and electrical generators. Major maintenance is expensed as incurred.

Goodwill

Goodwill represents the excess of purchase price of an acquisition over the fair value of net assets acquired in a business combination subject to ASC 805, Business Combinations. Goodwill is not amortized, but the potential impairment of goodwill is assessed at least annually and on an interim basis whenever events or changes in circumstances indicate that the carrying value may not be fully recoverable. Accounting rules require that the Company test at least annually, or more frequently when a triggering event occurs that indicates that the fair value of the reporting unit may be below its carrying amount, for possible goodwill impairment in accordance with the provisions of ASC 350-10. The Company performs its annual test in fourth quarter of each year.

During 2020, the Company has adopted the provisions of the Financial Accounting Standards Board (FASB) Accounting Standards Update (ASU) 2017-04, Intangibles — Goodwill and Other (Topic 350): Testing Goodwill for Impairment. Under this guidance, the Company performed qualitative test for goodwill on Beacon and Trustar for the year ended December 31, 2023. As a result of these tests, the Company determined that the fair value of its reporting unit exceeded its carrying value and, thus, the Company determined that goodwill was not impaired.

Intangible Assets

Intangible Assets and Liabilities

Identifiable intangible assets consist of three PPAs, one fueling station contract, one transmission/distribution interconnection, and the cost of intellectual property all of which are amortized using the straight-line method over the underlying applicable contract periods or useful lives which range from five to twenty years.

Intangible Liabilities

The PPA intangible liabilities are amortized using the straight-line method over their contract life. Amortization related to these intangible liabilities is included in RNG fuel revenue and Renewable power revenue, respectively, in the consolidated statements of operations.

Impairment of Long-Lived Assets

Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be fully recoverable. Recoverability of long-lived assets to be held and used is measured by a comparison of the carrying amount of an asset to future net undiscounted cash flows expected to be generated by the asset. If such assets are impaired, the impairment to be recognized is measured by the amount that the carrying amounts of the assets exceed the fair value of the assets. Assets disposed of are reported at the lower of the carrying amount or fair value less selling costs. There was no material impairment expense booked for the years ended December 31, 2023 and 2022.

Fair value is generally determined by considering (i) internally developed discounted cash flows for the asset group, and/or (ii) information available regarding the current market value for such assets. We use our best estimates in

making these evaluations and consider various factors, including future pricing and operating costs. However, actual future market prices and project costs could vary from the assumptions used in our estimates and the impact of such variations could be material.

Derivative Instruments

The Company estimates the fair value of its derivative instruments using available market information in accordance with ASC 820 for fair value measurements and disclosures of derivatives. Derivative instruments are measured at their fair value and recorded as either assets or liabilities unless they qualify for an exemption from derivative accounting measurement such as normal purchases and normal sales. All changes in the fair value of recognized derivatives are recognized currently in earnings.

The Company enters into electricity forward sale agreements. Some of these electricity forward sale agreements meet the definition of a derivative but qualify for the normal purchases and normal sales exception from derivative accounting treatment. In accordance with authoritative guidance for derivatives, the Company considers both qualitative and quantitative factors when determining whether a contract qualifies for the normal purchases and normal sales exception. There are two electricity forward sales agreements during 2022 that were recorded under the normal purchases and normal sales exception and, therefore, fair value adjustments were not required for the year ended December 31, 2023. Additionally, there were two electricity forward purchase agreements during 2023 that were recorded under the normal purchases and normal sales exception, and therefore, fair value adjustments were not required for the year ended December 31, 2023. Please see Note 9. Derivative Financial Instruments and Fair Value Measurements for additional information.

The Company enters into commodity swap arrangements as economic hedges against market price volatility of Renewable power sales. These commodity swap agreements do not qualify for the normal purchases and normal sales exception and therefore are accounted for as derivatives under ASC 815, Derivatives and Hedging. The Company does not designate its derivative instruments to qualify for hedge accounting. Accordingly, these commodity swap agreements are measured at their fair value and recorded as either current or non-current assets or liabilities and any changes in fair value are recorded as part of Revenues in its consolidated statements of operations for the years ended December 31, 2023 and 2022.

The Company maintains a risk management strategy that incorporates the use of interest rate swaps to minimize significant fluctuation in cash flows and/or earnings that are caused by interest rate volatility. The Company designated the interest rate swaps as cash flow hedges applies hedge accounting. The Company records the fair value of the interest rate swap as an asset or liability on its consolidated balance sheet. The effective portion of the swap is recorded in Accumulated other comprehensive income.

Interest rate swaps

During August 2022, the Company entered into two interest rate swaps for the notional amount of $61,926 of the OPAL Term Loan II at a fixed interest rate of 2.47% to hedge the SOFR-based floating interest rate. On August 16, 2022, the Company entered into a swaption for a notional amount of $13,074 with fixed rate of 2.32% with a maturity date of May 31, 2023. The Company accounted for the swaption as an economic hedge and included the change in the fair market value in the consolidated statement of operations.

The two interest rate swaps were designated and qualified as cash flow hedges. The Company uses interest rate swaps for the management of interest rate risk exposure, as an interest rate swap effectively converts a portion of the Company’s debt from a floating to a fixed rate. The interest rate swap is an agreement between the Company and counterparties to pay, in the future, a fixed-rate payment in exchange for the counterparties paying the Company a variable payment. The amount of the net payment obligation is based on the notional amount of the interest rate swap and the prevailing market interest

rates. The Company may terminate the interest rate swaps prior to their expiration dates, at which point a realized gain or loss may be recognized, or may be amortized over the original life of the interest rate swap if the hedged debt remains outstanding. The value of the Company’s commitment would increase or decrease based primarily on the extent to which interest rates move against the rate fixed for each swap.

The Company records the fair value of the interest rate swap as an asset or liability on its consolidated balance sheet. The effective portion of the swap is recorded in Accumulated other comprehensive income.

The Company may be exposed to credit risk on any of the derivative financial instruments that are in an asset position. Credit risk relates to the risk of loss that the Company would incur because of nonperformance by counterparties pursuant to the terms of their contractual obligations. To mitigate this risk, management monitors counterparty credit exposure on an annual basis and enters into these arrangements with large financial institutions. The necessary credit adjustments have been reflected in the fair value of financial derivative instruments. There are no credit-risk-related contingent features that could be triggered in derivative financial instruments that are in a liability position.

The Company enters into interest rate swap contracts with counterparties that allow for net settlement of derivative assets and derivative liabilities. The Company has made an accounting policy election to offset recognized amounts relating to these interest swaps within the consolidated balance sheets.

Commodity swap contracts

The Company utilizes commodity swap contracts to hedge against the unfavorable price fluctuations in market prices of electricity. The Company does not apply hedge accounting to these contracts. As such, unrealized and realized gain (loss) is recognized as a component of Renewable Power revenues in the consolidated statement of operations and Derivative financial asset — current and non-current in the consolidated balance sheets. These are considered to be Level 2 instruments in the fair value hierarchy. By using commodity swaps, the Company exposes itself to credit risk and market risk. Credit risk is the failure of the counter party to perform under the terms of the swap contract. When the fair value of the swap contract is positive, the counter party owes the Company creating a credit risk. The Company manages the credit risk by entering into contracts with financially sound counter parties. To mitigate this risk, management monitors counterparty credit exposure on an annual basis, and the necessary credit adjustments have been reflected in the fair value of financial derivative instruments. When the fair value of the swap contract is negative, the Company owes the counterparty creating a market risk that the market price is higher than the contract price resulting in the Company not participating in the opportunity to earn higher revenues.

Vulnerability Due to Certain Concentrations

Financial instruments that potentially subject the Company to concentration of credit risk consist principally of cash, cash equivalents, restricted cash, short term investments, derivative instruments and trade accounts receivable. The Company holds cash, cash equivalents and restricted cash at several major financial institutions, much of which exceeds FDIC insured limits. Historically, the Company has not experienced any losses due to such concentration of credit risk. The Company’s temporary cash investments policy is to limit the dollar amount of investments with any one financial institution and monitor the credit ratings of those institutions. While the Company may be exposed to credit losses due to the nonperformance of the holders of its deposits, the Company does not expect the settlement of these transactions to have a material effect on its results of operations, cash flows or financial condition.

Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents, and trade receivables. The Company places its cash with high credit quality financial institutions located in the United States of America. The Company performs ongoing credit evaluations of its customers.

Income Taxes

As a result of the Business Combination, the Company is the sole managing member of OPAL Fuels. OPAL Fuels is a limited liability company that is treated as a partnership for U.S. federal income tax purposes and for most applicable state and local income taxes. Any taxable income or loss generated by OPAL Fuels is passed through to and included in the taxable income or loss of its members, including the Company, on a pro-rata basis, subject to applicable tax regulations.

The Company accounts for income taxes in accordance with ASC Topic 740, Accounting for Income Taxes (“ASC Topic 740”), which requires the recognition of tax benefits or expenses on temporary differences between the financial reporting and tax bases of its assets and liabilities by applying the enacted tax rates in effect for the year in which the

differences are expected to reverse. Such net tax effects on temporary differences are reflected on the Company’s consolidated balance sheets as deferred tax assets and liabilities. Deferred tax assets are reduced by a valuation allowance when the Company believes that it is more-likely-than-not that some portion or all of the deferred tax assets will not be realized. The Company calculates the interim tax provision in accordance with the provisions of ASC Subtopic 740-270, Income Taxes; Interim Reporting. For interim periods, the Company estimates the annual effective income tax rate and applies the estimated rate to the year-to-date income or loss before income taxes.

As a result of the Company’s up-C structure effective with the Business Combinations, the Company expects to be a tax-paying entity. However, as the Company has historically been loss-making, any deferred tax assets created as a result of net operating losses and other deferred tax assets for the excess of tax basis in the Company's investment in Opal Fuels would be offset by a full valuation allowance. Prior to the Business Combination, OPAL Fuels was organized as a limited liability company, with the exception of one partially-owned subsidiary which filed income tax returns as a C-Corporation. The Company accounts for its income taxes using the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to the differences between the financial statement carrying amount of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the year in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in earnings in the period that includes the enactment date. Judgment is required in determining the provisions for income and other taxes and related accruals, and deferred tax assets and liabilities. In the ordinary course of business, there are transactions and calculations where the ultimate tax outcome is uncertain. Our federal and state income tax returns are subject to examination by federal and state tax authorities.

Investment in other entities

Investment in other entities includes the Company’s interests in certain investees which are accounted for under the equity method of accounting as the Company has determined that the investment provides the Company with the ability to exercise significant influence, but not control, over the investee. The Company’s investments in these nonconsolidated entities are reflected in the Company’s consolidated balance sheet at cost. The amounts initially recognized are subsequently adjusted for the impacts of impairment, capitalized interest and Company’s share of earnings (losses) which are recognized as income (loss) from equity method investments in the consolidated statement of operations after adjustment for the effects of any basis differences. Investments are also increased for contributions made to the investee and decreased by distributions from the investee and classified in the statement of cash flows using the cumulative earnings approach.

The Company evaluates its equity method investments for impairment whenever events or changes in circumstances indicate that a decline in value has occurred that is other than temporary. Evidence considered in this evaluation includes, but would not necessarily be limited to, the financial condition and near-term prospects of the investee, recent operating trends and forecasted performance of the investee, market conditions in the geographic area or industry in which the investee operates and the Company’s strategic plans for holding the investment in relation to the period of time expected for an anticipated recovery of its carrying value. If the investment is determined to have a decline in value deemed to be other than temporary, it is written down to estimated fair value in the same period the impairment was identified.

The Company uses the equity method to account for investments in affiliates that it does not control, but in which it has the ability to exercise significant influence over operating and financial policies. The Company's investments in these nonconsolidated affiliates are reflected in the Company's consolidated balance sheets under the equity method, and the Company's proportionate net income, if any, is included in the Company's consolidated statements of operations as income from equity method investments.

We continue to evaluate operational developments and the impact of the anticipated significant expansion of the operations of our existing equity method investments. As discussed below, the impact of formation of two new joint ventures which increased our number of RNG projects accounted for under equity method was a significant factor in our consideration of how to reflect the income (loss) from equity method investments appropriately within our consolidated statement of operations. Based on our analysis, it was determined that our equity method investments have evolved into a critical, integral part of our RNG segment business operations as they provide critical additional production capacity. Therefore, we have determined that the presentation of income (loss) from equity method investments as part of the operating income is more meaningful and useful information to the readers of our financial statements. As a result, we

have reclassified our portion of income (loss) from equity method investments to Operating income for all periods presented.

Leases

The following are the type of contracts that fall under ASC 842:

Lessor contracts

Fuel Provider agreements

Fuel provider agreements ("FPAs") are for the sale of brown gas, service and maintenance of sites. The Company is contracted to design and build a Fueling Station on the customer's property in exchange for the Company providing CNG/RNG to the customer for a determined number of years. These are considered to be operating leases with variable consideration. As per ASC 842, the revenue is recognized in the period earned.

Power Purchase agreements

Power purchase agreements ("PPAs") are for the sale of electricity generated at our Renewable Power facilities. All of our Renewable Power facilities operate under fixed pricing or indexed pricing based on market prices. Two of our Renewable Power facilities transfer the right to control the use of the power plant to the purchaser and are therefore classified as operating leases. The Company elected not to reassess the lease classification due to change in criteria under ASC 842 for these two PPAs. There were no amendments to these two contracts after the Adoption Date.

Included in Fuel Station Services revenues are $3,943 and $3,510 related to the lease portion of the FPAs for the years ended December 31, 2023 and 2022, respectively.

Included in Renewable Power revenues are $1,016 and $1,364 related to the lease element of the PPAs for the years ended December 31, 2023 and 2022, respectively.

Lessee contracts

Ground/Site leases

The Company through various of its indirectly owned subsidiaries holds site leases on landfills/dairy farms to build RNG generation facilities. Typically, the lease payments over the lease term are immaterial except for three of our RNG facilities - Beacon and two sites at our Central Valley project - MS Digester ("MS") and VS Digester ("VS").

–As of the Adoption Date, the lease at Beacon facility is for 20 years at a monthly rent of $11.

–The lease term for MD and VS is for a period of 20 years from their commercial operation date at a quarterly rent of $125.

On July 5, 2023, the Company through one of its indirectly owned subsidiary entered into a site lease on a dairy farm to build a facility to collect, process and deliver feedstock to an RNG facility. The lease term is 20 years from its commercial operations date at a quarterly rent of $21,250 with a 5% escalator on the calendar quarter in which the fifth anniversary occurs and every fifth anniversary thereafter. The Company recorded $782 as right-of-use operating lease and corresponding lease liability on its consolidated balance sheet as of December 31, 2023 using an incremental borrowing rate of 8.44%.

Additionally, the Company revised the commercial operation date for its leases for MD and VS by 10 months which changed the lease term for both the leases. Beginning in the fourth quarter of 2023 the Company treated this as a lease modification and increased its right-of-use asset and corresponding lease liability by $175 on its consolidated balance sheet as of December 31, 2023, using the incremental borrowing rate of 8.35%.

On August 25, 2022, the Company entered into a site lease to own and build fueling station. The Lease provided that OPAL shall pay a rent of $1 per year and $1 per GGE of CNG produced and a royalty of $0.30 per GGE for the amount of such excess volumes sold to third party contracted customers and general public. The term of the Lease was for ten years with an option to renew up to two additional five year periods. Such renewals are to commence automatically unless either Party elects not to renew this Agreement by giving the other party written notice at least 90 days prior to the end of the term. During 2022, the Company analyzed this contact and determined that the payments were considered variable consideration as the actual volumes were unknown at the lease inception and therefore expensed as incurred.

On December 27, 2023, OPAL entered into an Amended and Restated Lease Agreement where by the only payment terms have been amended to include minimum volume requirement there by requiring OPAL to pay lease payments of $1 per GGE of CNG pumped with annual minimum volumes for the lease term.

The Company determined that the site lease is a finance lease because the present value of the sum of the lease payments is substantially greater than the fair value of the parcel of land. Therefore, the Company recorded right-of-use asset and related lease liability on December 27, 2023 of $6,469 on its consolidated balance sheet as of December 31, 2023, using the incremental borrowing rate of 6.5%.

Office lease

The Company entered into a lease for office and warehouse space that became effective upon the termination of the original lease term on January 31, 2018. The term of the lease renewal was 36 months and contained an option to renew for an additional 24 months. In September 2020, the Company exercised this option. In March, 2022, the Company entered into an amendment to the lease which extended the lease term till January 2026. The rent for the lease is $26 per month with a built in escalation to $27 from February 1, 2022 to February 1, 2023, $43 from February 1, 2023 - February 1, 2024, $45 from February 1 2024 - February 1, 2025 and $46 for the remaining lease term. The Company accounted the change in the lease term as a lease modification and reassessed the right-of-use assets and corresponding lease liabilities as of March 31, 2022.

The Company currently shares office space with Fortistar and reimburses Fortistar on a monthly basis at a predetermined rate. The Company determined that this is not a lease under ASC 842 as there is no exclusive right-of-use and the Company does not have the right to control the use of the office space.

The Company determined that the three site leases and the one office lease are operating leases.

Under ASC 842, leases are classified as either finance or operating arrangements, with such classification affecting the pattern and classification of expense recognition in an entity's income statement. For operating leases, ASC 842 requires recognition in an entity’s income statement of a single lease expense, calculated so that the cost of the lease is allocated over the lease term, generally on a straight-line basis. Right-of-use assets represent a right to use

an underlying asset for the lease term and the related lease liability represents an obligation to make lease payments pursuant to the contractual terms of the lease agreement.

Based on the above guidance, the lease expense for the site leases is included as part of Cost of sales - RNG Fuel in its consolidated statement of operations for the years ended December 31, 2023 and 2022. The lease expense for the office lease is recorded as part Selling, general and administrative expenses in its consolidated statement of operations for the years ended December 31, 2023 and 2022.

Vehicle leases

The Company leases approximately 79 vehicles in our FM3 and OPAL Fuel Station Services subsidiaries. The leases contain repurchase options at the end of the lease term and the sum total of the lease payments represents substantially the fair value of the asset.

Under ASC 842, the Company determined that the vehicle leases are finance leases. For finance leases, ASC 842 requires recognition of amortization of right-of-use asset as part of depreciation and amortization expense and the interest on the finance lease liability as interest expense in the income statement. The Company accordingly recognized its lease expense on the vehicle leases as part of Depreciation, amortization and accretion expense and interest and financing expense, net in its statement of operations for the year ended December 31, 2023.

Lease Disclosures Under ASC 842

The objective of the disclosure requirements under ASC 842 is to enable users of an entity’s financial statements to assess the amount, timing and uncertainty of cash flows arising from lease arrangements. In addition to the supplemental qualitative leasing disclosures included above, below are quantitative disclosures that are intended to meet the stated objective of ASC 842.

Leases

The following are the type of contracts that fall under ASC 842:

Lessor contracts

Fuel Provider agreements

Power Purchase agreements

Included in Fuel Station Services revenues are $3,943 and $3,510 related to the lease portion of the FPAs for the years ended December 31, 2023 and 2022, respectively.

Included in Renewable Power revenues are $1,016 and $1,364 related to the lease element of the PPAs for the years ended December 31, 2023 and 2022, respectively.

Lessee contracts

Ground/Site leases

–As of the Adoption Date, the lease at Beacon facility is for 20 years at a monthly rent of $11.

–The lease term for MD and VS is for a period of 20 years from their commercial operation date at a quarterly rent of $125.

Office lease

The Company determined that the three site leases and the one office lease are operating leases.

an underlying asset for the lease term and the related lease liability represents an obligation to make lease payments pursuant to the contractual terms of the lease agreement.

Vehicle leases

Lease Disclosures Under ASC 842

Fair Value Measurements

Fair value measurements

The fair value of financial instruments, including long-term debt and derivative instruments is defined as the amount at which the instruments could be exchanged in a current transaction between willing parties. The carrying amount of cash and cash equivalents, accounts receivable, net, and accounts payable and accrued expenses approximates fair value due to their short-term maturities.

The Company follows ASC 820, Fair Value Measurement, regarding fair value measurements which establishes a three-tier fair value hierarchy and prioritizes the inputs used in valuation techniques that measure fair value. These tiers include:

Level 1 — defined as observable inputs such as quoted prices for identical instruments in active markets;

Level 2 — defined as quoted prices for similar instruments in active market, quoted prices for identical or similar instruments in markets that are not active, or model-derived valuations for which all significant inputs are observable market data;

Level 3 — defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company's assessment of the significance of an input to the fair value measurement requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels.

The Company values its energy commodity swap contracts based on the applicable geographical market energy forward curve. The forward curves are derived based on the quotes provided by New York Mercantile Exchange, Amerex Energy Services and Tradition Energy. The Company does not consider that the pricing index used involves significant judgement on the part of management. Therefore, the Company classifies these commodity swap contracts within Level 2 of the valuation hierarchy based on the observable market rates used to determine fair value.

The Company accounts for asset retirement obligations by recording the fair value of a liability for an asset retirement obligation in the period in which it is incurred and when a reasonable estimate of fair value can be made. The Company

estimates the fair value of asset retirement obligations by calculating the estimated present value of the cost to retire the asset. This estimate requires assumptions and judgments regarding the existence of liabilities, the amount and timing of cash outflows required to settle the liability, inflation factors, credit adjusted discount rates, and consideration of changes in legal, regulatory, environmental, and political environments. In addition, the Company determines the Level 3 fair value measurements based on historical information and current market conditions. These assumptions represent Level 3 inputs, which can regularly change. As such, the fair value measurement of asset retirement obligations is subject to changes in these unobservable inputs as of the measurement date. The Company used a discounted cash flow model in which cash outflows estimated to retire the asset are discounted to their present value using an expected discount rate. A significant increase (decrease) in the discount rate in isolation could result in a significantly lower (higher) fair value measurement.

Audit Information	12 Months Ended
Audit Information	Dec. 31, 2023
Audit Information [Abstract]
Auditor Firm ID	243
Auditor Name	BDO USA, P.C.
Auditor Location	Stamford, CT

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Total revenues	$ 256,108	$ 235,531
RNG Fuel
Total revenues	66,292	73,158
RNG Fuel \| Related Party
Total revenues	56,069	58,185
Fuel Station Services
Total revenues	135,012	117,415
Fuel Station Services \| Related Party
Total revenues	28,468	18,735
Renewable Power
Total revenues	54,804	44,958
Renewable Power \| Related Party
Total revenues	$ 6,614	$ 5,495

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

+ Details

Organization and Description of Business (Details)	12 Months Ended
Organization and Description of Business (Details)	Dec. 31, 2023 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	4

Reportable Segments and Geographic Information - Schedule of Total Revenues by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Total revenues	$ 256,108	$ 235,531
Equity Method Investment(s)
Revenues:
Total revenues	50,074	58,013
Other
Revenues:
Total revenues	840	131
Intersegment
Revenues:
Total revenues	(14,396)	(13,435)
Renewable Power
Revenues:
Total revenues	54,804	44,958
Renewable Power \| Operating Segments
Revenues:
Total revenues	54,804	47,210
RNG Fuel
Revenues:
Total revenues	66,292	73,158
RNG Fuel \| Operating Segments
Revenues:
Total revenues	115,526	141,903
Fuel Station Services
Revenues:
Total revenues	135,012	117,415
Fuel Station Services \| Operating Segments
Revenues:
Total revenues	$ 149,408	$ 117,735

- Definition

+ References

+ Details

Borrowings

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Borrowings

The following table summarizes the borrowings under the various debt facilities as of December 31, 2023 and December 31, 2022:


	December 31, 2023		December 31, 2022
Senior Secured Credit Facility, term loan	$	—	$	15,250
Less: current portion	—		(15,250)
Senior Secured Credit Facility, term loan	—		—
Senior Secured Credit Facility, working capital facility	—		7,500
Less: current portion	—		(7,500)
Senior Secured Credit Facility, working capital facility	—		—
OPAL Term Loan	186,618		96,090
Less: unamortized debt issuance costs	(10,086)		(1,758)
Less: current portion	—		(27,732)
OPAL Term Loan, net of debt issuance costs	176,532		66,600
Sunoma Loan	22,453		23,000
Less: unamortized debt issuance costs	(835)		(908)
Less: current portion	(1,608)		(380)
Sunoma Loan, net of debt issuance costs	20,010		21,712
Convertible Note Payable	—		28,528
Less: current portion	—		(28,528)
Convertible Note Payable	—		—
Municipality Loan	—		76
Less: current portion	—		(76)
Municipality Loan	—		—
Non-current borrowings total	$	196,542	$	88,312

As of December 31, 2023, principal maturities of debt are expected as follows, excluding any undrawn debt facilities as of the date of the consolidated balance sheet:


	OPAL Term Loan		Sunoma Loan		Total
Fiscal year:
2024	$	—	$	1,608	$	1,608
2025	22,394		1,743		24,137
2026	22,394		1,883		24,277
2027	22,394		2,036		24,430
2028	119,436		4,232		123,668
Thereafter	—		10,951		10,951
	$	186,618	$	22,453	$	209,071

Senior Secured Credit Facility

On March 20, 2023, the Company repaid in full the remaining outstanding loan under this facility.

On September 21, 2015, FM3, an indirect wholly-owned subsidiary of the Company, entered into a senior secured credit facility (the "Senior Secured Credit Facility") as a borrower and a syndicate of lenders, which provides for an aggregate principal amount of $150,000, consisting of (i) a term loan of $125,000 and a (ii) working capital letter of credit facility of up to $19,000 and a (iii) debt service reserve and liquidity facility of up to $6,000. The Company paid $14,300 to the lenders in connection with the transaction.

The loans under the Senior Secured Credit Facility had an interest rate of a fixed margin plus the secured overnight financing rate ("SOFR") for the relevant interest period. The fixed margin is 2.75% for the first four years, then 3.0% until October 8, 2021, and 3.25% thereafter.

On December 19, 2022, FM3 entered into an Omnibus and Consent Agreement (the “FM3 Amendment”). The FM3 Amendment amended the credit agreement, among other things, to (a) extend the maturity date of the obligations thereunder from December 20, 2022 to March 20, 2023, (b) permit OPAL Fuels to purchase the rights and obligations of certain exiting lenders at par, (c) prepay a portion of the outstanding loans made by the remaining lenders and (d) permit the release of certain project company subsidiaries of FM3 from the collateral securing the obligations under the credit agreement. Upon consummation of the FM3 Amendment, the Company repaid $54,929 of the outstanding term loan.

Patronage dividends

The Company is eligible to receive annual patronage dividends from one of its lenders, Cobank ACB under a profit sharing program. For the years ended December 31, 2023 and 2022, the Company received cash dividends of $125 and $126, respectively, which were recorded as credits to interest expense in the consolidated statements of operations. Additionally, the Company recorded $489 and as a long-term asset in the consolidated balance sheets at December 31, 2023 and 2022, which represents the Company's equity interest in Cobank SCB. These interests will be redeemed for cash beginning in 2024.

OPAL Term Loan

On October 22, 2021, OPAL Fuels Intermediate Holding Company LLC (“OPAL Intermediate Holdco”), an indirect wholly-owned subsidiary of the Company, entered into a $125,000 term loan agreement (the "OPAL Term Loan") with a syndicate of lenders. As of September 1, 2023, the total outstanding balance on the debt facility was $87,602.

On September 1, 2023, OPAL Intermediate Holdco restructured its existing credit agreement and entered into a new senior secured credit facility (the "Credit Agreement") with OPAL Intermediate HoldCo as the Borrower, direct and indirect subsidiaries of the Borrower as guarantors (the “Guarantors”), the lenders party thereto, as lenders, Apterra Infrastructure Capital LLC, Barclays Bank PLC, BofA Securities, Inc., Celtic Bank Corporation, Citibank, N.A., JP Morgan Chase Bank, N.A. Investec Inc. and ICBC Standard Bank PLC, as joint lead arrangers, and Bank of America, N.A., as administrative agent. Four of the existing lenders participated in the new credit facility.

The Credit Agreement provides for up to $450.0 million of initial and delayed draw term loans (with such delayed draw term loans available for up to 18 months after closing) and $50.0 million of revolving loans. On September 1, 2023, the Company drew down $144,118 and repaid (1) Intermediate HoldCo’s existing secured indebtedness in the amount of approximately $87,602 plus accrued interest, (2) certain accrued but unpaid returns in the amount of $15,669 of the paid-in-kind preferred dividend on our Redeemable preferred non-controlling interests, and (3) approximately $30,107 of indebtedness on Convertible Note Payable. Additionally, the Company utilized $9,000 of availability under the revolver loan to provide for the issuance of letters of credit to support the operations of the Borrower and Guarantors. The proceeds from the facility are expected to be used to fund other general corporate purposes of the Borrower and Guarantors. The Company paid transaction fees and expenses in the amount of approximately $9,976. The Company accounted for the above debt restructuring as debt modification for the existing lenders by performing an analysis on a lender by lender basis under ASC 470-50 Debt modifications and exchanges. As a result, the Company recorded debt extinguishment of $295 representing the fees allocated to the lenders who were repaid in full as part of Loss on debt extinguishment in the consolidated statement of operations for the year ended December 31, 2023. The remaining costs have been presented as a reduction of the outstanding loan.

The Company drew down an additional $42,500 under the term loan during the year ended December 31, 2023 to fund capital expenditure on construction of our RNG projects.

The outstanding loans under the Credit Agreement initially bear interest at an annual rate of Term SOFR plus 3.5%, increasing by 0.25% per annum during the term. Accrued interest on amounts outstanding under the delayed draw term loan facility must be paid on the last day of each applicable interest period. Commencing after the 18-month delayed draw term loan availability period expires, the outstanding principal amount of the term loans amortizes at a rate of 1% per quarter and the Borrower is obligated to pay a leverage based cash sweep ranging from 25% to 100% of distributable cash of Borrower and the Guarantors, and subject to certain other mandatory prepayment requirements. The term loans and revolving loans mature on September 1, 2028.

The Borrower’s and the Guarantors’ obligations under the Credit Agreement are secured by substantially all of their personal property assets (other than certain excluded assets identified in the Credit Agreement) and by a non-recourse pledge of the membership interests of the Borrower.

The Credit Agreement requires the Borrower to maintain a consolidated debt service coverage ratio of not less than 1.2:1.0, as tested on a trailing four quarters basis as of the last day of each fiscal quarter during the term commencing with the quarter ending December 31, 2023, and to maintain a consolidated debt to cash flow ratio of not greater than 4.5 to 1.0 during the delayed draw availability period, and not greater than 4.0 to 1.0 thereafter.

The Credit Agreement includes certain customary and project-related affirmative and negative covenants, including restrictions on distributions, and events of default, which include payment defaults breaches of covenants; changes of control materially incorrect or misleading representations or warranties bankruptcy or other events of insolvency and certain project-related defaults. As of December 31, 2023, the Company is in compliance with the financial covenants under the OPAL Term Loan. Additionally, the OPAL Term Loan contains restrictions on distributions and additional indebtedness.

The Company has the ability, during the delayed draw availability period and subject to the satisfaction of certain credit and project-related conditions precedent, to join other newly acquired subsidiaries with comparable renewable projects in development under the Credit Facility for comparable funding.

As of December 31, 2023 and 2022, the outstanding loan balance (current and non-current) excluding deferred financing costs was $186,618 and $96,090, respectively.

Sunoma Loan

On August 27, 2020, Sunoma, an indirect wholly-owned subsidiary of the Company entered into a debt agreement (the "Sunoma Loan Agreement") with Live Oak Banking Company for an aggregate principal amount of $20,000. Sunoma paid $635 in financing fees. The loan bears interest at the greater of prime rate plus 3.50%, or 7.75%. The amounts outstanding under the Sunoma Loan are secured by Sunoma's assets.

The Sunoma Loan Agreement contains certain financial covenants which require Sunoma to maintain (i) a maximum debt to net worth ratio not to exceed 5:1, (ii) a minimum current ratio not less than 1.0 and (iii) a minimum debt service coverage ratio of trailing four quarters not less than 1.25. On July 19, 2022, Sunoma completed the conversion of the construction loan into a permanent loan and increased the commitment from $20,000 to $23,000.

The loans under the Sunoma Loan Agreement bear interest at a rate of 7.68% and have a maturity date of July 19, 2033. The Company is required to pay a quarterly amortization of principal of $380 beginning in October 2023.

The significant assets of Sunoma are parenthesized in the consolidated balance sheets as December 31, 2023 and 2022. See Note 12. Variable Interest Entities for additional information.

Convertible Note Payable

On May 1, 2021, the Company acquired the remaining ownership interests in Beacon and signed an unsecured, contingently convertible note (the "Convertible Note Payable") with ARCC Beacon LLC ("Ares") for a total aggregate amount for $50,000 at an interest rate of 8.00% per annum. The Company had the option to pay interest on the Convertible Note in cash on a quarterly basis or payment-in-kind. The Company chose the option of payment-in-kind interest.

Upon the consummation of the Business Combination, Ares was permitted to choose to convert the total amount outstanding under the Convertible Note to shares of Class A common stock based on a pre-determined conversion formula. Upon completion of the Business Combination in July 2022, Ares elected to convert 50% of the outstanding amount under the Convertible Note to shares of Class A common stock. The Company issued 3,059,533 shares of Class A common stock and redeemed outstanding debt of $30,595.

The Company elected to account for the Convertible Note Payable using the fair value option in accordance with ASC 820, Fair Value Measurement. The fair value was subsequently remeasured on each reporting date and the change in fair value recorded as interest expense in the consolidated statement of operations for each reporting period. The Company repaid the outstanding balance in full on September 1, 2023.

The Company recorded $1,579 and $413 as change in fair value of Convertible Note for the years ended December 31, 2023 and 2022, respectively as interest and financing expense, net.

Municipality Loan

FM3, an indirect wholly-owned subsidiary of the Company, entered into a loan agreement for the construction of an interconnection that was initially funded by the municipality. The Company made payments to a municipality in the amount of $1,600 plus interest at a fixed annual rate of 3.00% through April 1, 2023. The loan was fully repaid in April 2023.

OPAL Term Loan II

On August 4, 2022, OPAL Intermediate Holdco 2 entered into a new Senior Secured Credit Facility (the "OPAL Term Loan II") with a syndicate of lenders. The indebtedness is guaranteed by certain of the direct and indirect subsidiaries of OPAL Intermediate Holdco 2. The OPAL Term Loan II provides for an approximately two-year delayed term loan facility (the "DDTL Facility") of up to a maximum aggregate principal amount of $100,000 and debt service reserve facility (the "DSR Facility") of up to a maximum aggregate principal amount of $5,000. The proceeds of the DDTL Facility were to be used to fund a portion of the construction of the RNG projects owned, either in full or through a joint venture with a third party, by the subsidiary guarantors. The proceeds of the DSR Facility are to be used solely to satisfy the balance to be maintained in the debt service reserve account. In connection with the transaction, the Company paid $2,200 in financing fees to the lenders and incurred $1,376 in third party fees.

On May 30, 2023, OPAL Intermediate Holdco 2 assigned to Paragon its rights and obligations under OPAL Term Loan II. The joint venture partner of Paragon reimbursed the Company $826 as its portion of the transaction costs incurred.

The Company expensed the remaining deferred financing costs of $1,895 as loss on debt extinguishment in its consolidated statement of operations for the year ended December 31, 2023. There were no amounts outstanding under the OPAL Term Loan II as of May 30, 2023.

Interest rates

2023

For the year ended December 31, 2023, the weighted average effective interest rate including amortization of debt issuance costs on the Senior Secured Credit Facility was 5.1% including a margin plus SOFR. The debt was repaid in full in March 2023.

For the year ended December 31, 2023, the weighted average effective interest rate including amortization of debt issuance costs on OPAL Term Loan was 7.4%.

For the year ended December 31, 2023, the interest rate on the Sunoma Loan was 9.00%.

For the year ended December 31, 2023, the payment-in-kind interest rate on Convertible Note Payable was 8.00%. The loan was fully repaid in September 2023.

2022

For the year ended December 31, 2022, the weighted average effective interest rate on the Senior Secured Credit Facility including amortization of debt issuance costs on Senior Secured Credit Facility was 6.9% including a margin plus LIBOR.

For year ended December 31, 2022, the weighted average effective interest rate on the OPAL Term Loan including amortization of debt issuance costs was 6.1%.

For year ended December 31, 2022, the interest rate on the Sunoma loan was 8.3%, respectively.

For the year ended December 31, 2022, the payment-in-kind interest rate on Convertible Note Payable was 8.0%.

For the year ended December 31, 2022, the weighted average interest rate on the Municipality Loan was 3.6%.

The following table summarizes the Company's total interest and financing expense, net for the year ended December 31, 2023 and 2022:


	Twelve Months Ended December 31,
	2023		2022
Senior Secured Credit Facility	$	311	$	3,779
Municipality loan	—		7
Convertible Note Payable	1,579		413
Sunoma Loan	1,803		1,810
OPAL Term Loan (1)	5,231		894
Commitment fees and other finance fees	1,491		1,027
Interest expense on finance leases	105		45
Amortization of deferred financing cost	1,720		1,943
Interest income	(2,934)		(3,278)
Total interest and financing expense, net	$	9,306	$	6,640

(1) Excludes $5,475 and $3,678 of interest capitalized and recorded as part of Property, Plant and Equipment for the years ended December 31, 2023 and 2022, respectively. Includes $953 of lenders fees expensed in relation to debt modification.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Derivative Financial Instruments and Fair Value Measurements - Derivatives Fair Values on Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities)	$ 0	$ 1,136
Swaption \| Derivatives designated as economic hedges:
Derivatives, Fair Value [Line Items]
Derivative assets	0	182
Interest rate swaps \| Derivatives designated as cash flow hedges:
Derivatives, Fair Value [Line Items]
Derivative assets	$ 0	$ 954

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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+ Details

Stock-based Compensation - Restricted Stock Units (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Mar. 31, 2023 $ / shares shares	Dec. 31, 2023 USD ($) installment $ / shares shares	Dec. 31, 2022 $ / shares shares
Stock Options:
Unvested stock options, beginning balance (in shares)		0
Granted (in shares)	196,961	196,961
Forfeitures (in shares)		(21,071)
Unvested stock options, ending balance (in shares)		175,890	0
Weighted average fair value per stock options on grant date
Weighted average fair value per stock option on grant date, beginning balance (in dollars per share) \| $ / shares		$ 0
Granted, Weighted average fair value per stock option on grant date (in dollars per share) \| $ / shares		5.26
Forfeitures, Weighted average fair value per stock option on grant date (in dollars per share) \| $ / shares		5.26
Weighted average fair value per stock option on grant date, ending balance (in dollars per share) \| $ / shares	$ 5.26	$ 5.26	$ 0
Aggregate fair value \| $		$ 925
Total unvested awards outstanding (in shares)		1,365,506
Total unvested awards outstanding, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares		$ 6.75
Total unvested awards outstanding, Aggregate fair value \| $		$ 9,223
Restricted Stock Units (RSUs)
Restricted Stock Units and Performance Stock Units
Beginning balance (in shares)		422,349
Granted (in shares)	888,831
Vested (in shares)		(280,928)
Withheld for settlement of taxes (in shares)		(123,397)
Forfeitures (in shares)		(106,435)
Ending balance (in shares)		949,936	422,349
Weighted average fair value per unit on grant date
Weighted average fair value per unit on grant date, beginning balance (in dollars per share) \| $ / shares		$ 7.94
Vested, Weighted average fair value per unit on grant date (in dollars per share) \| $ / shares		7.94
Withheld for settlement of taxes, Weighted average fair value per unit on grant date (in dollars per share) \| $ / shares		7.94
Forfeitures, Weighted average fair value per unit on grant date (in dollars per share) \| $ / shares		7.19
Weighted average fair value per unit on grant date, ending balance (in dollars per share) \| $ / shares		$ 6.98	$ 7.94
Aggregate fair value \| $		$ 6,627
Weighted average fair value per stock options on grant date
Vesting percentage			10000.00%
Restricted Stock Units (RSUs), March 2023
Restricted Stock Units and Performance Stock Units
Granted (in shares)		1,024,414
Weighted average fair value per unit on grant date
Granted, Weighted average fair value per unit on grant date (in dollars per share) \| $ / shares		$ 6.97
Weighted average fair value per stock options on grant date
Number of installments \| installment		3
Vesting term (in years)		3 years
Restricted Stock Units (RSUs), June 2023
Restricted Stock Units and Performance Stock Units
Granted (in shares)		13,933
Weighted average fair value per unit on grant date
Granted, Weighted average fair value per unit on grant date (in dollars per share) \| $ / shares		$ 7.38
Weighted average fair value per stock options on grant date
Vesting percentage		10000.00%
Performance Shares
Restricted Stock Units and Performance Stock Units
Beginning balance (in shares)		0
Granted (in shares)	274,617	274,617
Vested (in shares)		(83)
Withheld for settlement of taxes (in shares)		(31)
Forfeitures (in shares)		(34,823)
Ending balance (in shares)		239,680	0
Weighted average fair value per unit on grant date
Weighted average fair value per unit on grant date, beginning balance (in dollars per share) \| $ / shares		$ 0
Granted, Weighted average fair value per unit on grant date (in dollars per share) \| $ / shares		6.97
Vested, Weighted average fair value per unit on grant date (in dollars per share) \| $ / shares		6.97
Withheld for settlement of taxes, Weighted average fair value per unit on grant date (in dollars per share) \| $ / shares		6.97
Forfeitures, Weighted average fair value per unit on grant date (in dollars per share) \| $ / shares		6.97
Weighted average fair value per unit on grant date, ending balance (in dollars per share) \| $ / shares		$ 6.97	$ 0
Aggregate fair value \| $		$ 1,671
Weighted average fair value per stock options on grant date
Vesting percentage		10000.00%
Employee Stock Option
Weighted average fair value per stock options on grant date
Number of installments \| installment		3
Vesting term (in years)		3 years

Intangible Assets, Net - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 563	$ 694

Reportable Segments and Geographic Information - Schedule of Interest Expense on Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Interest and Financing Expense, Net:	$ (9,306)	$ (6,640)
Equity Method Investment(s)
Segment Reporting Information [Line Items]
Interest and Financing Expense, Net:	356	0
Renewable Power \| Operating Segments
Segment Reporting Information [Line Items]
Interest and Financing Expense, Net:	(280)	(5,261)
RNG Fuel \| Operating Segments
Segment Reporting Information [Line Items]
Interest and Financing Expense, Net:	(9,324)	(899)
Fuel Station Services \| Operating Segments
Segment Reporting Information [Line Items]
Interest and Financing Expense, Net:	134	0
Corporate \| Operating Segments
Segment Reporting Information [Line Items]
Interest and Financing Expense, Net:	$ (192)	$ (480)

Property, Plant, and Equipment, Net - Summary of Property, Plant, and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Finance lease	$ 9,048	$ 1,236
Gross property, plant, equipment and finance leases	449,894	397,538
Less: accumulated depreciation	(110,401)	(100,215)
Property, plant, and equipment, net	339,493	297,323
Plant and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	205,188	201,655
CNG/RNG fueling stations
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	51,749	34,567
Construction in progress (1)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	175,060	152,105
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,585	2,585
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,303	1,303
Finance lease	6,469	0
Service equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,481	1,888
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	815	815
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	489	313
Finance lease	2,580	1,236
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	307	307
Computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	277	277
Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 591	$ 487

CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE NON-CONTROLLING INTEREST, REDEEMABLE PREFERRED NON-CONTROLLING INTEREST AND STOCKHOLDERS' (DEFICIT) EQUITY - USD ($)
$ in Thousands

Total

Class A common stock

Class D common stock

Redeemable Preferred non-controlling interests

Redeemable non-controlling interests

Common stock

Class A common stock

Common stock

Class D common stock

Additional paid-in capital

Accumulated deficit

Other comprehensive income

Non-redeemable non-controlling interests

Class A common stock in treasury

Class A common stock

Beginning balance at Dec. 31, 2021

$ 30,210

$ 63,545

Increase (Decrease) In Temporary Equity And Redeemable Noncontrolling Interest [Abstract]

Net income

29,597

Unrealized gain on cash flow hedges

$ 1,093

Redeemable preferred non-controlling interest issuance

100,000

(267)

Conversion of Private and Public Warrants

18,061

Change in redemption value of Redeemable non-controlling interests

908,008

Proceeds from non-redeemable non-controlling interest

(132)

Amortization on payment to acquire non-redeemable non-controlling interest

(183)

Other comprehensive loss

1,093

Stock-based compensation

1,299

Paid-in-kind preferred dividend

7,932

(7,188)

Ending balance at Dec. 31, 2022

138,142

1,013,833

Beginning balance, common (in shares) at Dec. 31, 2021

144,399,037

Beginning balance, treasury (in shares) at Dec. 31, 2021

Beginning balance at Dec. 31, 2021

1,202

$ 0

$ 14

$ 0

$ 1,188

$ 0

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net income

2,982

4,135

(1,153)

Unrealized gain on cash flow hedges

195

Issuance of common stock from the reverse recapitalization and PIPE Investments, net of warrant liability, put option and earnout liability (in shares)

22,611,857

Issuance of common stock from the reverse recapitalization and PIPE Investments, net of warrant liability, put option and earnout liability

68,359

$ 2

68,357

Conversion of Convertible Note Payable to common shares and Issuance of Class A common stock on warrant exchange (in shares)

3,059,533

Conversion of Convertible Note Payable to common shares and Issuance of Class A common stock for vesting of equity awards

30,595

Conversion of Private and Public Warrants (in shares)

3,806,376

Conversion of Private and Public Warrants

7,859

$ 1

7,858

Change in redemption value of Redeemable non-controlling interests

(908,008)

(103,804)

(804,204)

Proceeds from non-redeemable non-controlling interest

23,234

(3,176)

26,410

Stock-based compensation

170

Paid-in-kind preferred dividend

(744)

Dividends on Redeemable preferred non-controlling interests

(744)

Ending balance, common (in shares) at Dec. 31, 2022

29,477,766

144,399,037

29,477,766

144,399,037

Ending balance, treasury (in shares) at Dec. 31, 2022

Ending balance at Dec. 31, 2022

(774,156)

$ 3

$ 14

(800,813)

195

26,445

$ 0

Increase (Decrease) In Temporary Equity And Redeemable Noncontrolling Interest [Abstract]

Net income

106,645

Change in redemption value of Redeemable non-controlling interests

802,720

Change in redemption value of Redeemable non-controlling interests

(312,396)

Other comprehensive loss

(1,086)

Stock-based compensation

4,943

Payment of paid-in-kind preferred dividends

(16,536)

Dividends on Redeemable preferred non-controlling interests (in shares)

11,011

Dividends on Redeemable preferred non-controlling interests

(9,219)

Ending balance at Dec. 31, 2023

$ 132,617

$ 802,720

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net income

20,379

20,728

(349)

Other comprehensive loss

(210)

Conversion of Convertible Note Payable to common shares and Issuance of Class A common stock on warrant exchange (in shares)

49,633

Conversion of Convertible Note Payable to common shares and Issuance of Class A common stock for vesting of equity awards

338

Change in redemption value of Redeemable non-controlling interests

312,397

(2,285)

314,682

Proceeds from non-redeemable non-controlling interest

12,753

2,899

9,854

Cancellation of fractional shares on warrant exchange

(26)

Exercise of put option on forward purchase contract - Meteora (in shares)

(1,635,783)

Exercise of put option on forward purchase contract - Meteora

(11,614)

$ (11,614)

Forfeiture of Class A common stock (in shares)

(197,258)

Issuance of Class A common stock for vesting of equity awards (in shares)

^[1]

280,928

Issuance of Class A common stock for vesting of equity awards

^[1]

(896)

Issuance of Class A common stock under the ATM programs (in shares)

^[2]

90,103

Issuance of Class A common stock under the ATM programs

^[2]

366

Stock-based compensation

961

Deconsolidation of entities

^[3]

(36,045)

(1,383)

(34,662)

Distributions to non-redeemable non-controlling interests

(333)

Dividends on Redeemable preferred non-controlling interests

(1,792)

Ending balance, common (in shares) at Dec. 31, 2023

29,701,146

144,399,037

29,701,146

144,399,037

Ending balance, treasury (in shares) at Dec. 31, 2023

1,635,783

(1,635,783)

Ending balance at Dec. 31, 2023

$ (477,852)

$ 3

$ 14

$ 0

$ (467,195)

$ (15)

$ 955

$ (11,614)

[1]	Represents the equity awards vested net of shares of Class A common stock withheld for taxes. Please see Note 16. Stock-based Compensation for additional information.
[2]	During the fourth quarter of 2023, the Company issued shares of Class A common stock under the Company's ATM program. Please see Note 2. Summary of Significant Accounting Policies for additional information.
[3]	As of May 30, 2023, two of our RNG facilities, Emerald and Sapphire were deconsolidated and accounted for under equity method as per ASC 323. Please see Note 3. Investment in Other Entities and Note 12. Variable Interest Entities for additional information.

Summary of Significant Accounting Policies - Earnout Awards, Put Option On Forward Purchase Agreement and Redeemable Noncontrolling Interests Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 26, 2023	Jan. 23, 2023	Jul. 21, 2022	Jul. 20, 2022	Jul. 31, 2022	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Contingent consideration (in shares)					10,000,000
Gain on Earnout Awards							$ 6,890
Stock issued (in shares)								1,000,000
Fair value of treasury shares acquired							11,614
Common Class B \| Opal Fuels
Derivative [Line Items]
Stock issued (in shares)			144,399,037
Redeemable non-controlling interests
Derivative [Line Items]
Change in redemption value of Redeemable non-controlling interests							802,720	$ 908,008
Sponsor \| Class A common stock
Derivative [Line Items]
Forfeited shares (in shares)	197,258
Sponsor Letter Agreement
Derivative [Line Items]
Percentage of common stock subject to vesting and forfeiture conditions					10.00%
Common stock subject to vesting and forfeiture conditions, period					60 months
Forward Purchase Agreement \| Meteora
Derivative [Line Items]
Contingent consideration (in shares)			2,000,000
Contingent consideration, escrow		$ 16,391	$ 20,040
Contingent consideration, price (in dollars per share)			$ 10.02			$ 10.02
Contingent consideration period			6 months
Fair value of treasury shares acquired		$ 11,614					11,614
Closing share price (in dollars per share)		$ 7.01
Offset to derivative financial liability							$ 4,777
Forward Purchase Agreement \| Meteora \| ArcLight Class A Common Stock
Derivative [Line Items]
Stock issued (in shares)		1,635,783		2,000,000		1,635,783

Summary of Significant Accounting Policies - Revenue Recognition, Contract Balances, Parts Inventory, Fuel Station Construction Backlog and Major Maintenance Narrative (Details) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2023 facility	Dec. 31, 2022 USD ($) subsidiary	Dec. 31, 2023 USD ($) producer facility	Dec. 31, 2022 USD ($)	Nov. 29, 2021
Revenue from External Customer [Line Items]
Number of natural gas producers \| producer			2
Total revenues			$ 256,108	$ 235,531
Revenue recognized included in contract liabilities			8,013	9,785
Inventory reserves		$ 3	20	3
Backlog			37,531
Major maintenance expense			7,240	$ 4,701
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue from External Customer [Line Items]
Backlog			$ 29,450
Backlog recognition period (in months)			12 months
Transferred over Time
Revenue from External Customer [Line Items]
Percentage of revenue recognized over time			19.00%	21.00%
RNG Fuel
Revenue from External Customer [Line Items]
Total revenues			$ 66,292	$ 73,158
Fuel Station Services
Revenue from External Customer [Line Items]
Total revenues			135,012	117,415
Environmental credits held for sale			7,354	3,523
Renewable Power
Revenue from External Customer [Line Items]
Total revenues			54,804	44,958
Number of wholly-owned subsidiaries \| subsidiary		2
Related Party \| RNG Fuel
Revenue from External Customer [Line Items]
Total revenues			56,069	58,185
Related Party \| Fuel Station Services
Revenue from External Customer [Line Items]
Total revenues			28,468	18,735
Related Party \| Renewable Power
Revenue from External Customer [Line Items]
Total revenues			$ 6,614	5,495
RNG fuel
Revenue from External Customer [Line Items]
Term of agreement (in years)	3 years
Number of facilities \| facility	3		2
NextEra \| RNG fuel
Revenue from External Customer [Line Items]
Minimum of environmental attributes to be sold, percentage					90.00%
OCI Fuels B.V. ("OCI") \| Environmental Attributes
Revenue from External Customer [Line Items]
Term of agreement (in years)		3 years
OCI Fuels B.V. ("OCI") \| Environmental Attributes \| Renewable Power
Revenue from External Customer [Line Items]
Total revenues			$ 16,325	$ 3,114

Intangible Assets, Net (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets with Definite Lives

Intangible assets, net, consisted of the following at December 31, 2023 and December 31, 2022:


	December 31, 2023
	Cost		Accumulated Amortization		Intangible Assets, Net		Weighted Average Amortization Period (Years)
Power purchase agreements	$	8,999	$	(7,926)	$	1,073	18.1
Transmission/distribution interconnection	1,600		(1,076)		524		15.1
Intellectual property	43		(36)		7		5.0
Total intangible assets	$	10,642	$	(9,038)	$	1,604


	December 31, 2022
	Cost		Accumulated Amortization		Intangible Assets, Net		Weighted Average Amortization Period (years)
Power purchase agreements	$	8,999	$	(7,488)	$	1,511	18.1
Transmission/distribution interconnection	1,600		(971)		629		15.1
CNG sales contract	807		(799)		8		10.0
Intellectual property	43		(24)		19		5.0
Total intangible assets	$	11,449	$	(9,282)	$	2,167

Schedule of Estimated Future Amortization Expense For Definite Lived Intangible Assets

At December 31, 2023, estimated future amortization expense for intangible assets is as follows:


Fiscal year:
2024	267
2025	267
2026	239
2027	238
Thereafter	593
	$	1,604

Income Taxes

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Income Taxes

For the years ended December 31, 2023 and 2022, the Company recognized federal and state income tax expense of $0 and $0, respectively.

The effective tax rate was 0% for the years ended December 31, 2023 and 2022. The difference between the Company's effective tax rate for the year ended December 31, 2023, and the U.S. statutory tax rate of 21% was primarily due to a full valuation allowance recorded on the Company's net U.S. and State deferred tax assets, income (loss) from pass-through entities not attributable to Class A common stock and state and local taxes.


	Twelve Months Ended December 31,
	2023		2022
Expected income tax at statutory rate	$	26,639	$	6,884

State income taxes, net of federal	—		184
Gain on deconsolidation of entities	(25,803)		—
Earnings attributable to non-controlling interest	(1,063)		(6,172)
Change in valuation allowance	140		(896)
Other	87		—
Total tax expense - continuing operations	$	—	$	—

The components of the deferred tax assets and liabilities are as follows:


	Twelve Months Ended December 31,
	2023		2022
Deferred tax assets:
Investment in partnership	$	25,133	$	26,637
163j interest limitation	608		109
Federal NOL carryforward	1,165		3,094
State NOL carryforward	785		677
Total deferred tax assets	27,691		30,517

Valuation allowance for deferred tax assets	(27,691)		(30,517)
Deferred tax assets, net of valuation allowance	—		—
Deferred tax liabilities:
Total deferred tax liabilities	—		—
Net deferred income tax asset or liability	$	—	$	—

As of December 31, 2023, the Company is in a net deferred tax asset position. Based on all available positive and negative evidence, including projections of future taxable income, the Company believes it is more likely than not that the deferred tax assets will not be realized. As such, a full valuation allowance was recorded against the net deferred tax asset position for federal and state purposes as of December 31, 2023. For purposes of determining pre-tax income/(loss) for the pre Business Combination period, the Company relied on the historical financial statements of Opal Fuels, LLC as this is the best information to represent the historic pre-tax income/(loss) of Opal Fuels Inc. The Company is not forecasting significant ordinary income or capital gain to realize the Company's deferred tax assets. Should future results of operations demonstrate a trend of profitability, additional weight may be placed upon other evidence, such as forecasts of future taxable income. Additionally, future events and new evidence, such as the integration and realization of profit from recently acquired assets, could lead to increased weight being placed upon future forecasts and the conclusion that some or all of the deferred tax assets are more likely than not to be realizable. Therefore, the Company believes that there is a possibility that some or all of the valuation allowance could be released in the foreseeable future.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//740/tableOfContent

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-14

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-21

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482526/740-270-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-17

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482603/740-30-50-2

+ Details

Reportable Segments and Geographic Information - Schedule of Depreciation, Amortization and Accretion (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Depreciation, Amortization, and Accretion:	$ 14,565	$ 13,136
Equity Method Investment(s)
Segment Reporting Information [Line Items]
Depreciation, Amortization, and Accretion:	(2,502)	(2,073)
Other
Segment Reporting Information [Line Items]
Depreciation, Amortization, and Accretion:	0	125
Renewable Power \| Operating Segments
Segment Reporting Information [Line Items]
Depreciation, Amortization, and Accretion:	5,567	5,696
RNG Fuel \| Operating Segments
Segment Reporting Information [Line Items]
Depreciation, Amortization, and Accretion:	7,770	8,542
Fuel Station Services \| Operating Segments
Segment Reporting Information [Line Items]
Depreciation, Amortization, and Accretion:	$ 3,730	$ 846

Variable Interest Entities (Tables)

12 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Variable Interest Entities

The following table summarizes the major consolidated balance sheet items for consolidated VIEs as of December 31, 2023 and 2022. The information below is presented on an aggregate basis based on similar risk and reward characteristics and the nature of our involvement with the VIEs, such as:

•All of the VIEs are RNG facilities and they are reported under the RNG Fuel Supply segment;

•The nature of our interest in these entities is primarily equity based and therefore carry similar risk and reward characteristics;

The amount of assets that can only be used to settle obligations of the VIEs are parenthesized in the consolidated balance sheets and are included in the asset totals listed in the table below.


	As of December 31, 2023		As of December 31, 2022
Assets
Current assets:
Cash and cash equivalents	$	166	$	12,506
Accounts receivable, net	33		966
Restricted cash - current	4,395		6,971
Environmental credits held for sale	29		—
Prepaid expenses and other current assets	107		415
Total current assets	4,730		20,858
Property, plant and equipment, net	26,626		73,140
Restricted cash, non-current	1,850		2,923
Total assets	$	33,206	$	96,921

Liabilities and equity
Current liabilities:
Accounts payable	$	744	$	4,896
Accounts payable, related party	1,046		433
Accrued expenses	647		646
Accrued capital expenses	—		7,821
Other current liabilities	92		—
Sunoma Loan- current portion	1,608		380
Total current liabilities	4,137		14,176
Sunoma loan, net of debt issuance costs	20,010		21,712
Other long-term liabilities	211		—
Total liabilities	24,358		35,888
Equity
Stockholders' equity	7,893		34,588
Non-redeemable non-controlling interests	955		26,445
Total equity	8,848		61,033
Total Liabilities and Equity	$	33,206	$	96,921

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

Stock-based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Mar. 31, 2023 USD ($) $ / shares shares	Jul. 21, 2022 shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 $ / shares shares	Dec. 31, 2020 subsidiary	Dec. 31, 2019 subsidiary
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock issued (in shares)				1,000,000
Stock options issued (in shares)	196,961		196,961
Weighted average exercise price (in dollars per share) \| $ / shares	$ 5.26		$ 5.26	$ 0
Closing share price (in dollars per share) \| $ / shares	6.97
Exercise price (in dollars per share) \| $ / shares	$ 6.97
Fair value \| $	$ 6,955
Cost expected to be recognized \| $			$ 6,308
Period of recognition (in years)			2 years 3 months 18 days
2022 Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock issued (in shares)		19,811,726
Restricted Stock Units (RSUs)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Awards granted (in shares)	888,831
Forfeitures (in shares)			106,435
Restricted Stock Units (RSUs) \| Director
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Awards granted (in shares)	135,583
Performance Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Awards granted (in shares)	274,617		274,617
Forfeitures (in shares)			34,823
Employee Stock Option
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expiration term (in years)	10 years
Annual risk free interest rate	4.04%
Volatility rate	65.00%
Vesting term (in years)			3 years
Profit Interests
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Awards granted (in shares)			0
Number of wholly-owned subsidiaries \| subsidiary					4	4
Percentage of issued stock, minimum					34.00%	34.00%
Percentage of issued stock, maximum					37.00%	37.00%
Vesting term (in years)					5 years	5 years
Vested percentage			86.00%	66.00%
Unvested percentage			14.00%	34.00%
Forfeitures (in shares)			0
Parent Equity Awards
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Future compensation to be recognized \| $			$ 453
Parent Equity Awards \| Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting term (in years)			1 year
Parent Equity Awards \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting term (in years)			2 years

Borrowings - Sunoma Loan Narrative (Details) - USD ($) $ in Thousands	Jul. 19, 2022	Aug. 27, 2020
Sunoma Loan
Debt Instrument [Line Items]
Aggregate principal amount		$ 20,000
Maximum debt to worth ratio		500.00%
Minimum current ratio		100.00%
Minimum required debt service coverage ratio		125.00%
Sunoma Loan \| Minimum
Debt Instrument [Line Items]
Effective interest rate		7.75%
Sunoma Loan \| Prime Rate
Debt Instrument [Line Items]
Basis spread on permanent loan		3.50%
Sunoma Loan \| Sunoma
Debt Instrument [Line Items]
Financing fees paid		$ 635
Permanent Loan
Debt Instrument [Line Items]
Aggregate principal amount	$ 23,000
Interest rate on loan	7.68%
Payment of quarterly amortization	$ 380

Reportable Segments and Geographic Information - Schedule of Cash Paid for Purchases of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Cash paid for Purchases of Property, Plant, and Equipment:	$ 113,874	$ 131,410
Operating Segments \| Renewable Power
Segment Reporting Information [Line Items]
Cash paid for Purchases of Property, Plant, and Equipment:	0	2,001
Operating Segments \| Fuel Station Services
Segment Reporting Information [Line Items]
Cash paid for Purchases of Property, Plant, and Equipment:	17,182	7,565
Operating Segments \| RNG Fuel
Segment Reporting Information [Line Items]
Cash paid for Purchases of Property, Plant, and Equipment:	$ 96,692	$ 121,844

Derivative Financial Instruments and Fair Value Measurements - Other Derivative Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Change in fair value of derivative instruments, net	$ 1,100	$ 498
Other Derivatives
Derivative [Line Items]
Change in fair value of derivative instruments, net	6,579	32,583
Contingent liability payable to non-controlling interest
Derivative [Line Items]
Change in fair value of derivative instruments, net	0	4,365
Put option to Meteora
Derivative [Line Items]
Change in fair value of derivative instruments, net	(311)	134
Sponsor Earnout Awards
Derivative [Line Items]
Change in fair value of derivative instruments, net	1,890	1,911
OPAL Earnout Awards
Derivative [Line Items]
Change in fair value of derivative instruments, net	5,000	35,200
Public and Private Warrants
Derivative [Line Items]
Change in fair value of derivative instruments, net	$ 0	$ (9,027)

Variable Interest Entities

12 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interest Entities

As of December 31, 2023, the Company held equity interests in seven VIEs — Sunoma, GREP, Emerald, Sapphire, Paragon, SJI Joint Venture (RNG Atlantic and RNG Burlington) and Central Valley. On May 30, 2023, the Company together with a third-party environmental solutions company formed Paragon. The Company owns 50% of ownership interest in Paragon. Concurrent with the formation of Paragon, the Company contributed its 50% ownership interests in Emerald and Sapphire to Paragon.

Upon the execution of the above the transaction, the Company reassessed its equity interests in Emerald and Sapphire under ASC 810, Consolidation and determined that the Company does not have a controlling financial interest in Paragon under ASC 810 because the governance of the joint venture is driven by an independent board jointly controlled by the joint venture partner and OPAL equally and there are substantive participating rights held by the joint venture partner in the significant activities of Paragon.

Based on the above analysis, the Company determined that it should account for its ownership interests in Paragon under the equity method of accounting pursuant to ASC 323, Investments Equity Method and Joint Ventures, prospectively, as the Company has the ability to exercise significant influence, but not control over the joint venture company.

Prior to May 30, 2023, the Company consolidated these two entities in accordance with the variable interest entity model guidance under ASC 810, Consolidation.

Venture under ASC 810 because the governance of the joint venture is driven by a board jointly controlled by the joint venture partner and OPAL equally and there are substantive participating rights held by the joint venture partner in the significant activities of SJI Joint Venture. As of December 31, 2023, the Company contributed $2,115 towards RNG Atlantic.

As of December 31, 2023, GREP, Paragon and SJI were presented as equity method investments and the remaining two VIEs Sunoma and Central Valley are consolidated by the Company.

At December 31, 2022, GREP has been presented as an equity method investment and the remaining four VIEs Sunoma, Emerald, Sapphire, and Central Valley are consolidated by the Company.

In 2020, the Company acquired a variable interest in Sunoma in a joint venture with a third-party who does not have any equity at risk but participates in proportionate share of income or losses, which may be significant. Additionally, the assets in Sunoma are collateralized under the Sunoma loan, the proceeds of which are used for partial financing of the construction of the Sunoma facility. Therefore, the significant assets and liabilities of Sunoma are parenthesized in the consolidated balance sheets as of December 31, 2023 and 2022.

The Company determined that each of these entities are VIEs and in its capacity as a managing member except for Emerald and Sapphire, the Company is the primary beneficiary. The Company is deemed as a primary beneficiary based on two conditions:

•The Company, as a managing member, has the power to order the activities that significantly impact the economic performance of the two entities including establishment of strategic, operating, and capital decisions for each of these entities; and

•The Company has the obligation to absorb the potential losses for the right to receive potential benefits, which could be significant to the VIE;

As a primary beneficiary, the Company consolidates these entities in accordance with the variable interest entity model guidance under ASC 810, Consolidation.

Our variable interests in each of our VIEs arise primarily from our ownership of membership interests, construction commitments, our provision of operating and maintenance services, and our provision of environmental credit processing services to VIEs.

•All of the VIEs are RNG facilities and they are reported under the RNG Fuel Supply segment;

•The nature of our interest in these entities is primarily equity based and therefore carry similar risk and reward characteristics;

The amount of assets that can only be used to settle obligations of the VIEs are parenthesized in the consolidated balance sheets and are included in the asset totals listed in the table below.


	As of December 31, 2023		As of December 31, 2022
Assets
Current assets:
Cash and cash equivalents	$	166	$	12,506
Accounts receivable, net	33		966
Restricted cash - current	4,395		6,971
Environmental credits held for sale	29		—
Prepaid expenses and other current assets	107		415
Total current assets	4,730		20,858
Property, plant and equipment, net	26,626		73,140
Restricted cash, non-current	1,850		2,923
Total assets	$	33,206	$	96,921

Liabilities and equity
Current liabilities:
Accounts payable	$	744	$	4,896
Accounts payable, related party	1,046		433
Accrued expenses	647		646
Accrued capital expenses	—		7,821
Other current liabilities	92		—
Sunoma Loan- current portion	1,608		380
Total current liabilities	4,137		14,176
Sunoma loan, net of debt issuance costs	20,010		21,712
Other long-term liabilities	211		—
Total liabilities	24,358		35,888
Equity
Stockholders' equity	7,893		34,588
Non-redeemable non-controlling interests	955		26,445
Total equity	8,848		61,033
Total Liabilities and Equity	$	33,206	$	96,921

Borrowings - Opal Term Loan II and Interest Rates Narrative (Details) - USD ($) $ in Thousands			12 Months Ended
	May 30, 2023	Aug. 04, 2022	Dec. 31, 2023	Dec. 31, 2022	Oct. 22, 2021	May 01, 2021	Aug. 27, 2020	Sep. 21, 2015
Debt Instrument [Line Items]
Loss on extinguishment			$ 2,190	$ 0
Loan outstanding			$ 209,071
Senior Secured Credit Facility
Debt Instrument [Line Items]
Aggregate principal amount								$ 150,000
Weighed average effective interest rate			5.10%	6.90%
Sunoma Loan
Debt Instrument [Line Items]
Aggregate principal amount							$ 20,000
Loan outstanding			$ 22,453
Interest rate during period			9.00%	8.30%
Convertible Note Payable
Debt Instrument [Line Items]
Aggregate principal amount						$ 50,000
Interest rate on loan			8.00%	8.00%		8.00%
Municipality loan
Debt Instrument [Line Items]
Weighed average effective interest rate				3.60%
Interest rate on loan			3.00%
Opal Term Loan II, Delayed Term Loan Facility ("DDTL") \| Secured Debt
Debt Instrument [Line Items]
Term of loan (in years)		2 years
Aggregate principal amount		$ 100,000
Opal Term Loan II, Debt Service Reserve ("DSR") Facility \| Secured Debt
Debt Instrument [Line Items]
Aggregate principal amount		5,000
Opal Term Loan II \| Secured Debt
Debt Instrument [Line Items]
Financing fees paid		2,200
Third party fees		$ 1,376
Loss on extinguishment			$ 1,895
Loan outstanding	$ 0
Opal Term Loan II \| Secured Debt \| Paragon
Debt Instrument [Line Items]
Reimbursement received	$ 826
OPAL Term Loan \| Secured Debt
Debt Instrument [Line Items]
Aggregate principal amount					$ 125,000
Loss on extinguishment			295
Loan outstanding			$ 186,618
Weighed average effective interest rate			7.40%	6.10%

CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE NON-CONTROLLING INTEREST, REDEEMABLE PREFERRED NON-CONTROLLING INTEREST AND STOCKHOLDERS' (DEFICIT) EQUITY (Parenthetical)	May 30, 2023 deconsolidated_entity
Number of deconsolidated entities	2
RNG Fuel
Number of deconsolidated entities	2

Borrowings - Convertible Note Payable and Municipality Loan Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	May 01, 2021
Debt Instrument [Line Items]
Change in fair value of Convertible Note Payable		$ 1,579	$ 413
Convertible Note Payable
Debt Instrument [Line Items]
Aggregate principal amount				$ 50,000
Interest rate on loan		8.00%	8.00%	8.00%
Percentage of notes converted	50.00%
Redeemed outstanding debt	$ 30,595
Change in fair value of Convertible Note Payable		$ 1,579	$ 413
Convertible Note Payable \| Class A common stock
Debt Instrument [Line Items]
Shares issued upon conversion (in shares)	3,059,533
Municipality loan
Debt Instrument [Line Items]
Interest rate on loan		3.00%
Payments		$ 1,600

Derivative Financial Instruments and Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Interest Rate Swaps

The following table summarizes the interest rate swaps in place as of December 31, 2023 and December 31, 2022:


Interest rate swap detail					Notional Amount
Trade date	Fixed rate		Start date	End date	December 31, 2023		December 31, 2022

August 15, 2022	2.47	%	June 28, 2024	August 4, 2027	$	—	$	41,284
August 15, 2022	2.47	%	June 28, 2024	August 4, 2027	—		20,642
					$	—	$	61,926

Derivatives Fair Values on Balance Sheet

The location and amounts of derivatives fair values in the consolidated balance sheets are:


	December 31, 2023		December 31, 2022		Location of Fair Value Recognized in Balance Sheet
Derivatives designated as economic hedges:
Current portion of swaption	$	—	$	182	Derivative financial assets, current portion

Derivatives designated as cash flow hedges:
Non current portion of the interest rate swaps	—		954		Derivative financial assets, non-current portion
	$	—	$	1,136

The following table summarizes the derivative assets and liabilities related to commodity swaps as of December 31, 2023 and December 31, 2022


	Fair Value				Location of Fair value recognized in Balance Sheet
	December 31, 2023		December 31, 2022
Derivatives designated as economic hedges
Current portion of unrealized gain on commodity swaps	$	633	$	—	Derivative financial asset, current portion
Current portion of unrealized loss on commodity swaps	—		(130)		Derivative financial liability, current portion

Effect of Derivative Instruments on Statement of Operations

The effect of interest rate swaps on the consolidated statement of operations were as follows:


	Twelve Months Ended December 31,				Location of (Loss) Gain Recognized in Operations from Derivatives
	2023		2022
Interest rate swaps	$	—	$	992
Swaption	(46)		182
Net periodic settlements - interest rate swaps (1)	1,146		(676)
	$	1,100	$	498	Change in fair value of derivative instruments, net

(1) Includes $334 reclassification into earnings from our equity method investments and $812 reclassification on the gain on termination of interest rate swaps on May 30, 2023.

The following table summarizes the effect of commodity swaps on the consolidated statements of operations for the years ended December 31, 2023 and 2022:


Derivatives not designated as hedging instruments	Location of (loss) gain recognized	Twelve Months Ended December 31,
		2023		2022
Commodity swaps - realized gain (loss)	Revenues - Renewable power	$	1,839	$	(1,757)
Commodity swaps - unrealized gain (loss)	Revenues - Renewable power	763		(512)
Total realized and unrealized gain (loss)	Revenues - Renewable power	$	2,602	$	(2,269)

Fair Value of Derivative Instruments on Balance Sheet and Effect of Netting Arrangements

The following table summarizes the fair value of interest rate swaps on the Company's consolidated balance sheets and the effect of netting arrangements and collateral on its financial position:


	Gross Amounts of Recognized Assets/(Liabilities)		Gross Amounts Offset in the Balance Sheet		Net Amounts of Assets/(Liabilities) in the Balance Sheet
Balance, December 31, 2023:
Interest rate swap asset	$	—	$	—	$	—
Swaption asset	—		—		—
	$	—	$	—	$	—
Balance, December 31, 2022:
Interest rate swap asset	$	954	$	—	$	954
Swaption asset	182		—		182
	$	1,136	$	—	$	1,136

Fair Value of Derivative Instruments on Balance Sheet and Effect of Netting Arrangements

The following table summarizes the fair value of interest rate swaps on the Company's consolidated balance sheets and the effect of netting arrangements and collateral on its financial position:


	Gross Amounts of Recognized Assets/(Liabilities)		Gross Amounts Offset in the Balance Sheet		Net Amounts of Assets/(Liabilities) in the Balance Sheet
Balance, December 31, 2023:
Interest rate swap asset	$	—	$	—	$	—
Swaption asset	—		—		—
	$	—	$	—	$	—
Balance, December 31, 2022:
Interest rate swap asset	$	954	$	—	$	954
Swaption asset	182		—		182
	$	1,136	$	—	$	1,136

Summary of Commodity Swaps And Other Derivatives

The following table summarizes the commodity swaps in place as of December 31, 2023 and December 31, 2022.

Trade Date

Period From

Period To

Notional Quantity per Year (“MWh”)

Average Contract Price (per MWh)

October 17, 2022

January 1, 2023

December 31, 2024

70,176

68.50

October 17, 2022

January 1, 2023

December 31, 2024

26,280

65.50

November 17, 2022

January 1, 2023

December 31, 2024

35,088

81.50

The following table summarizes the effect of change in fair value of other derivative liabilities on the consolidated statements of operations for the years ended December 31, 2023 and 2022:


Derivative liability	Twelve Months Ended December 31,				Location of (Loss) Gain Recognized in Operations from Derivatives
	2023		2022
Contingent liability payable to non-controlling interest	$	—	$	4,365
Put option to Meteora	(311)		134
Sponsor Earnout Awards	1,890		1,911
OPAL Earnout Awards	5,000		35,200
Public and Private Warrants	—		(9,027)
	$	6,579	$	32,583	Change in fair value of derivative instruments, net

Assets and Liabilities Measured at Fair Value on Recurring Basis

The Company's assets and liabilities that are measured at fair value on a recurring basis include the following as of December 31, 2023 and December 31, 2022, set forth by level, within the fair value hierarchy:


	Fair value as of December 31, 2023
	Level 1		Level 2		Level 3		Total
Liabilities:
Asset retirement obligation	$	—	$	—	$	6,728	$	6,728
Earnout liabilities	—		—		1,900		1,900
Assets:
Cash and cash equivalents and restricted cash - current and non-current (1)	47,242		—		—		47,242
Short term investments	9,875		—		—		9,875
Commodity swap contracts	—		633		—		633


	Fair value as of December 31, 2022
	Level 1		Level 2		Level 3		Total
Liabilities:
Asset retirement obligation	$	—	$	—	$	6,256	$	6,256
Convertible Note Payable	—		28,528		—		28,528
Put option with Meteora	—		—		4,466		4,466
Commodity swap contracts	—		130		—		130
Earnout liabilities	—		—		8,790		8,790
Assets:
Cash and cash equivalents and restricted cash - current and non-current (1)	77,221		—		—		77,221
Short term investments	64,976		—		—		64,976
Swaption	—		182		—		182
Interest rate swaps	—		954		—		954

(1) Includes balances in money market accounts of $31,965 and $6,769, respectively as of December 31, 2023 and 2022.

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References + Details

Reportable Segments and Geographic Information - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)
Reclassification [Line Items]
Number of operating segments \| segment	4
Total revenues	$ 256,108	$ 235,531
Number of reportable segments \| segment	4
Fuel Station Services
Reclassification [Line Items]
Total revenues	$ 135,012	117,415
Cost of sales	115,322	98,845
RNG Fuel
Reclassification [Line Items]
Total revenues	66,292	73,158
Cost of sales	32,028	32,367
Renewable Power
Reclassification [Line Items]
Total revenues	54,804	44,958
Cost of sales	36,550	31,580
Revision of Prior Period, Reclassification, Adjustment \| Fuel Station Services
Reclassification [Line Items]
Total revenues	64,504	48,175
Cost of sales	51,032	37,331
Revision of Prior Period, Reclassification, Adjustment \| RNG Fuel
Reclassification [Line Items]
Total revenues	(64,504)	(48,175)
Cost of sales	(51,032)	(37,331)
Revision of Prior Period, Reclassification, Adjustment \| Renewable Power
Reclassification [Line Items]
Total revenues	20,124	5,498
Revision of Prior Period, Reclassification, Adjustment \| Renewable Power \| Environmental Attributes
Reclassification [Line Items]
Total revenues	$ (20,124)	$ (5,498)

Summary of Significant Accounting Policies - Changes in the Asset Retirement Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation, beginning balance	$ 6,256
Payment of Asset retirement obligations during the year	(49)
Accretion expense	521	$ 121
Asset retirement obligation, ending balance	6,728	6,256
Less: current portion	(3,860)	(1,296)
Total asset retirement obligation, net of current portion	$ 2,868	$ 4,960

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Income Tax Expense

The difference between the Company's effective tax rate for the year ended December 31, 2023, and the U.S. statutory tax rate of 21% was primarily due to a full valuation allowance recorded on the Company's net U.S. and State deferred tax assets, income (loss) from pass-through entities not attributable to Class A common stock and state and local taxes.


	Twelve Months Ended December 31,
	2023		2022
Expected income tax at statutory rate	$	26,639	$	6,884

State income taxes, net of federal	—		184
Gain on deconsolidation of entities	(25,803)		—
Earnings attributable to non-controlling interest	(1,063)		(6,172)
Change in valuation allowance	140		(896)
Other	87		—
Total tax expense - continuing operations	$	—	$	—

Components of Deferred Tax Assets and Liabilities

The components of the deferred tax assets and liabilities are as follows:


	Twelve Months Ended December 31,
	2023		2022
Deferred tax assets:
Investment in partnership	$	25,133	$	26,637
163j interest limitation	608		109
Federal NOL carryforward	1,165		3,094
State NOL carryforward	785		677
Total deferred tax assets	27,691		30,517

Valuation allowance for deferred tax assets	(27,691)		(30,517)
Deferred tax assets, net of valuation allowance	—		—
Deferred tax liabilities:
Total deferred tax liabilities	—		—
Net deferred income tax asset or liability	$	—	$	—

Summary of Significant Accounting Policies - Accounts Receivable, Net, Fuel Tax Credit Receivable/Payable, and Asset Retirement Obligation Narrative (Details) $ in Thousands	Dec. 31, 2023 USD ($) uSD_per_Gasoline_Gallon	Dec. 31, 2022 USD ($)
Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 0	$ 0
Accrued federal fuel tax credits (in dollars per gasoline gallon) \| uSD_per_Gasoline_Gallon	0.50
Fuel tax credits receivable	$ 5,345	4,144
Fuel tax credits payable	4,558	3,320
Estimated value of total asset retirement obligation	$ 6,728	$ 6,256

Reportable Segments and Geographic Information

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Reportable Segments and Geographic Information

The Company is organized into four operating segments based on the characteristics of its renewable power generation, dispensing portfolio, and the nature of other products and services. During the first quarter of 2023, the Company changed its internal reporting to its Chief Operating Decision Makers to change the composition of revenues included in our reportable segments. The internal reporting was changed to provide more visibility into our RNG fuel production and operations and to align fuel dispensing revenues with construction and service of fuel dispensing stations. Additionally, the Company changed its internal reporting to report revenues from RECs and ISCC Carbon Credits from RNG Fuel to Renewable Power segment during the third quarter of 2023. This is primarily to reflect a strategic business change to identify all revenues earned from environmental attributes generated from Renewable Power facilities in the same segment.

Therefore, the Company reclassified the revenues and the corresponding cost of sales for CNG tolling business which were previously presented as part of Revenues - RNG Fuel and Cost of sales - RNG Fuel to Revenues - Fuel station services and Cost of sales - Fuel station services, respectively. The Company reclassified revenues earned from sale of RECs and ISCC Carbon Credits from Revenues - RNG Fuel to Revenues - Renewable Power. The Company also adjusted the revenues and cost of sales for the prior year period presented for comparison purposes.

For the years ended December 31, 2023 and 2022, the Company classified revenues from fuel dispensing business of $64,504 and $48,175, respectively, as part of Revenues - Fuel station services.

For the years ended December 31, 2023 and 2022, the Company classified revenues from the sale of environmental attributes generated from Renewable Power facilities of $20,124 and $5,498, respectively, as part of Revenues - Renewable Power.

For the years ended December 31, 2023 and 2022, the Company classified cost of sales related to the fuel dispensing business of $51,032 and $37,331, respectively as part of Cost of sales - Fuel station services.

We aligned our reportable segments disclosure to align with the information and internal reporting that is provided to our Chief Operating Decision Makers. Therefore, the Company reassessed its reportable segments and revised all the prior periods to make the segment disclosures comparable.

•RNG Fuel. The RNG Fuel segment relates to all RNG supply directly related to the generation and sale of brown gas and environmental credits, and consists of:

◦Development and construction – RNG facilities in which long term gas right contracts have been, or are in the process of being ratified and the construction of RNG generation facilities.

◦RNG supply operating facilities – This includes the generation, extraction, and sale of RNG - plus associated RINs and LCFSs from landfills.

For the year ended December 31, 2023 and 2022, the Company has accounted for its interests in Pine Bend, Reynolds Noble Road, GREP, Paragon and SJI under the equity method of accounting and the results of operations of Beacon, New River, Polk County, Cottonwood, Central Valley, Prince William and Sunoma were consolidated in its consolidated statement of operations. As of May 30, 2023, the Company deconsolidated Emerald and Sapphire. As a result, the Company consolidated Emerald and Sapphire for the period between January 1, 2023 and May 30, 2023 and recorded its ownership interests in Paragon which includes Emerald and Sapphire as equity method investment for the period between May 30, 2023 and December 31, 2023.

As of December 31, 2023, Central Valley, Prince William, Polk County, Cottonwood and Sapphire are not operational. Sunoma became operational in December 2021, Noble Road in January 2022, New River in April 2022 and Pine Bend in September 2022. Emerald began commercial operations in the third quarter of 2023.

•Fuel Station Services. Through its Fuel Station Services segment, the Company provides construction and maintenance services to third-party owners of vehicle Fueling Stations and performs fuel dispensing activities including generation and minting of environmental credits. This segment includes:

◦Service and maintenance contracts for RNG/CNG fueling sites and a manufacturing division that builds Compact Fueling Systems and Defueling systems.

◦Third Party CNG Construction of Fueling Stations - design/build and serve as general contractor for typically Guarantee Maximum Price or fixed priced contracts for customers usually lasting less than one year.

◦RNG and CNG fuel dispensing stations for vehicle fleets - This includes both the dispensing and sale of brown gas and the environmental credit generation and monetization. The Company operates Fueling Stations that dispense gas for vehicles. This also includes the development and construction of these facilities.

•Renewable Power Portfolio. The Renewable Power portfolio segment generates renewable power and associated environmental credits through methane-rich landfills which is then sold to public utilities throughout the United States. The Renewable Power portfolio operates primarily in Southern California.

•Corporate. This segment consists of activities managed and maintained at the Company corporate level primarily including but not limited to:

◦Executive, accounting, finance, sales activities such as: payroll, stock compensation expense, travel and other related costs.

◦Insurance, professional fees (audit, tax, legal etc.).

The Company has determined that each of the four operating segments meets the characteristics of a reportable segment under U.S. GAAP. The Company's activities and assets that are not associated with the four reportable segments are summarized in the "Other" category below. These include corporate investment income, interest income and interest expense, income tax expense, and other non-allocated costs.


	Twelve Months Ended December 31,
	2023		2022
Revenues:
Renewable Power	$	54,804	$	47,210
RNG Fuel	115,526		141,903
Fuel Station Services	149,408		117,735
Other (1)	840		131
Intersegment	(14,396)		(13,435)
Equity Method Investment(s)	(50,074)		(58,013)
	$	256,108	$	235,531

____________

(1) Other includes revenues of management fee revenues earned from operations and management of unconsolidated entities and Fortistar Contracting LLC.


	Twelve Months Ended December 31,
	2023		2022
Interest and Financing Expense, Net:
Renewable Power	$	(280)	$	(5,261)
RNG Fuel	(9,324)		(899)
Fuel Station Services	134		—
Corporate	(192)		(480)
Equity Method Investment(s)	356		—
	$	(9,306)	$	(6,640)


	Twelve Months Ended December 31,
	2023		2022
Depreciation, Amortization, and Accretion:
Renewable Power	$	5,567	$	5,696
RNG Fuel	7,770		8,542
Fuel Station Services	3,730		846
Other(1)	—		125
Equity Method Investment(s)	(2,502)		(2,073)
	$	14,565	$	13,136

(1)Other includes amortization of intangible assets and depreciation expense not allocated to any segment.


	Twelve Months Ended December 31,
	2023		2022
Net income (loss):
Renewable Power	$	12,472	$	4,681
RNG Fuel	16,678		26,330
Fuel Station Services	17,908		18,245
Corporate	74,441		(22,461)
Equity Method Investment(s)	5,525		5,784
	$	127,024	$	32,579


	Twelve Months Ended December 31,
	2023		2022
Cash paid for Purchases of Property, Plant, and Equipment:
Renewable Power	$	—	$	2,001
Fuel Station Services	17,182		7,565
RNG Fuel	96,692		121,844
	$	113,874	$	131,410


	December 31, 2023		December 31, 2022
Total Assets:
Renewable Power	$	37,479	$	43,468
RNG Fuel	342,176		376,933
Fuel Station Services	152,625		90,486
Corporate and other	15,230		82,204
Equity Method Investment(s)	207,099		51,765
	$	754,609	$	644,856

Geographic Information: The Company's assets and revenue generating activities are domiciled in the United States.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-15

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-31

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-40

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//280/tableOfContent

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 26
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-26

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-34

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

+ Details

Derivative Financial Instruments and Fair Value Measurements - Interest Rate Swaps (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Aug. 31, 2022
Interest rate swaps
Derivative [Line Items]
Fixed rate			2.47%
Notional Amount	$ 0	$ 61,926	$ 61,926
Interest rate swap 1
Derivative [Line Items]
Fixed rate	2.47%
Notional Amount	$ 0	41,284
Interest rate swap 2
Derivative [Line Items]
Fixed rate	2.47%
Notional Amount	$ 0	$ 20,642

Investments in Other Entities - Summary of Equity Method Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Current assets	$ 128,073	$ 211,983
Current liabilities	76,391	152,905
Total revenues	256,108	235,531
Net income	127,024	32,579
Net income from equity method investments	5,525	5,784
Equity Method Investment(s)
Schedule of Equity Method Investments [Line Items]
Current assets	25,114	14,563
Non-current assets	171,633	109,414
Current liabilities	26,205	6,765
Non-current liabilities	34,021	13,825
Members' equity	136,521	103,388
Total revenues	50,074	58,013
Gross profit	12,065	41,932
Net income	6,323	$ 29,983
GREP
Schedule of Equity Method Investments [Line Items]
Realized gain from commodity swap contracts	$ 32,796

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Statement of Comprehensive Income [Abstract]

Net income

$ 127,024

$ 32,579

Other comprehensive income:

Effective portion of the cash flow hedge attributable to equity method investments

(8)

334

Reclassification adjustments included in earnings

^[1]

(1,146)

Net unrealized (loss) gain on cash flow hedges

(142)

954

Total other comprehensive (loss) income

(1,296)

1,288

Total comprehensive income

125,728

33,867

Less:

Net income attributable to Redeemable non-controlling interests

106,645

29,597

Other comprehensive (loss) income attributable to Redeemable non-controlling interests

(1,086)

1,093

Effective portion of the cash flow hedge attributable to equity method investments

(349)

(1,153)

Dividends on Redeemable preferred non-controlling interests

1,792

744

Comprehensive income attributable to Class A common stockholders

$ 18,726

$ 3,586

[1]

Represents the reclassification of the gain on termination of interest rate swaps of $812 on May 30, 2023. See Note 9. Derivative Financial Instruments and Fair Value Measurements for additional information. Additionally, there is a $334 reclassification into earnings from our equity method investments.

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Federal income tax expense	$ 0	$ 0
State income tax expense	$ 0	$ 0
Effective tax rate	0.00%	0.00%

Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Net Loss Per Unit

The following table summarizes the calculation of basic and diluted net loss per share:


	Twelve Months Ended December 31,
	2023		2022
Net loss attributable to Class A common stockholders	$	18,936	$	3,391
Less:change in fair value of the put option on the forward purchase agreement	—		(134)
Diluted Net loss attributable to Class A common stockholders	18,936		3,257

Weighted average number of shares of Class A common stock - basic	27,148,538		25,774,312
Effect of dilutive Restricted Stock Units	345,478		14,203
Effect of the dilutive put option on the forward purchase agreement	—		273,883
Weighted average number of shares of Class A common stock - diluted	27,494,016		26,062,398
Net loss per share of Class A common stock
Basic	$	0.70	$	0.13
Diluted	$	0.69	$	0.12

Leases - Lease Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 27, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Operating leases	7.81%
Financing leases	6.60%
2024	$ 3,605
2025	3,591
2026	2,921
2027	2,492
2028 and beyond	23,516
Future minimum lease payments	36,125
Total lease liabilities	21,248		$ 13,149
Operating lease liabilities - current portion	638		630
Lease liabilities - current portion	2,036		1,079
Lease liabilities - non-current portion, operating lease	11,824		11,245
Lease liabilities - non-current portion	19,212		12,070
Discount based on incremental borrowing rate	$ 14,877
Site leases
Lessee, Lease, Description [Line Items]
Operating leases	7.60%
Financing leases	6.50%
2024, operating lease	$ 1,058
2024, finance lease	963
2025, operating lease	1,129
2025, finance lease	963
2026, operating lease	1,129
2026, finance lease	963
2027, operating lease	1,129
2027, finance lease	963
2028 and beyond, operating lease	19,266
2028 and beyond, finance lease	4,250
Future minimum lease payments, operating lease	23,711
Future minimum lease payments, finance lease	8,102
Lease liabilities, operating lease	11,352
Lease liabilities, finance lease	6,158	$ 6,469
Operating lease liabilities - current portion	130		181
Lease liabilities - current portion, finance lease	571		0
Lease liabilities - non-current portion, operating lease	11,222		10,135
Lease liabilities - non-current portion, finance lease	5,587		0
Discount based on incremental borrowing rate, operating lease	12,359
Discount based on incremental borrowing rate, finance lease	$ 1,944
Office lease
Lessee, Lease, Description [Line Items]
Operating leases	3.60%
2024, operating lease	$ 540
2025, operating lease	562
2026, operating lease	47
2027, operating lease	0
2028 and beyond, operating lease	0
Future minimum lease payments, operating lease	1,149
Lease liabilities, operating lease	1,110
Operating lease liabilities - current portion	508		449
Lease liabilities - non-current portion, operating lease	602		1,110
Discount based on incremental borrowing rate, operating lease	$ 39
Vehicles
Lessee, Lease, Description [Line Items]
Financing leases	6.30%
2024, finance lease	$ 1,044
2025, finance lease	937
2026, finance lease	782
2027, finance lease	400
2028 and beyond, finance lease	0
Future minimum lease payments, finance lease	3,163
Lease liabilities, finance lease	2,628
Lease liabilities - current portion, finance lease	827		449
Lease liabilities - non-current portion, finance lease	1,801		$ 825
Discount based on incremental borrowing rate, finance lease	$ 535

Summary of Significant Accounting Policies - Receivables, Contract Assets and Contract Liabilities From Contracts With Customers (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Accounts receivable, net	$ 27,623	$ 31,083
Contract assets:
Cost and estimated earnings in excess of billings	4,630	7,027
Accounts receivable retainage, net	2,160	2,744
Contract assets	6,790	9,771
Contract liabilities:
Billings in excess of costs and estimated earnings	6,314	8,013
Contract liabilities	$ 6,314	$ 8,013

Leases - Narrative (Details) $ in Thousands					3 Months Ended		12 Months Ended
Leases - Narrative (Details) $ in Thousands	Feb. 02, 2025 USD ($)	Dec. 27, 2023 USD ($) uSD_Per_Gasoline_Gallon_Equivalent	Jul. 05, 2023 USD ($)	Aug. 25, 2022 USD ($) renewal_option uSD_Per_Gasoline_Gallon_Equivalent	Dec. 31, 2023 USD ($) agreement lease vehicle	Sep. 30, 2023 facility	Feb. 01, 2025 USD ($)	Feb. 01, 2024 USD ($)	Dec. 31, 2023 USD ($) facility agreement lease vehicle	Feb. 01, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 01, 2022 agreement
Operating Leased Assets [Line Items]
Total revenues									$ 256,108		$ 235,531
Operating lease right-of-use asset					$ 12,301				12,301		11,744
Finance lease					$ 9,048				9,048		1,236
Operating lease liabilities - current and non-current									$ (613)		(640)
Number of vehicles \| vehicle					79				79
RNG fuel
Operating Leased Assets [Line Items]
Number of facilities \| facility						3			2
Fuel Station Services
Operating Leased Assets [Line Items]
Total revenues									$ 135,012		117,415
Renewable Power
Operating Leased Assets [Line Items]
Total revenues									$ 54,804		44,958
Power purchase agreements
Operating Leased Assets [Line Items]
Number of agreements \| agreement					2				2			2
Power purchase agreements \| Renewable Power
Operating Leased Assets [Line Items]
Total revenues									$ 1,016		1,364
Fuel Provider Agreements ("FPAs") \| Fuel Station Services
Operating Leased Assets [Line Items]
Total revenues									3,943		3,510
Site leases
Operating Leased Assets [Line Items]
Operating lease right-of-use asset					$ 11,330				11,330		10,338
Lease liabilities, operating lease					11,352				11,352
Annual rent				$ 1
Rent per gasoline gallon equivalent (in dollars per gasoline gallon equivalent) \| uSD_Per_Gasoline_Gallon_Equivalent		1		1
Royalty per gasoline gallon equivalent (in dollars per gasoline gallon equivalent) \| uSD_Per_Gasoline_Gallon_Equivalent				0.30
Term of contract, finance lease (in years)				10 years
Number of options to renew \| renewal_option				2
Renewal term, finance lease (in years)				5 years
Term of written notice (in days)				90 days
Finance lease		$ 6,469			6,468				6,468		0
Lease liabilities, finance lease		$ 6,469			$ 6,158				$ 6,158
Incremental borrowing rate		6.50%
Number of leases \| lease					3				3
Site leases \| Beacon
Operating Leased Assets [Line Items]
Term of lease												20 years
Monthly rent									$ 11
Site leases \| MS Digester ("MS") And VS Digester ("VS")
Operating Leased Assets [Line Items]
Term of lease					20 years				20 years
Quarterly rent									$ 125
Discount rate upon adoption, operating lease					8.35%				8.35%
Additional renewal term (in years)					10 months				10 months
Right-of-use asset obtained for operating lease liability					$ 175
Operating lease liabilities - current and non-current					175
Site leases \| RNG fuel
Operating Leased Assets [Line Items]
Number of facilities \| facility									3
Term of lease			20 years
Quarterly rent			$ 21,250
Rent increase			5.00%
Operating lease right-of-use asset					782				$ 782
Lease liabilities, operating lease					$ 782				$ 782
Discount rate upon adoption, operating lease					8.44%				8.44%
Office lease
Operating Leased Assets [Line Items]
Term of lease					36 months				36 months
Operating lease right-of-use asset					$ 971				$ 971		$ 1,406
Lease liabilities, operating lease					$ 1,110				$ 1,110
Additional renewal term (in years)					24 months				24 months
Rent expense									$ 26	$ 27
Number of leases \| lease					1				1
Office lease \| Subsequent Event \| Forecast
Operating Leased Assets [Line Items]
Rent expense	$ 46						$ 45	$ 43

Summary of Significant Accounting Policies - Disaggregation of Revenue By Product Line (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2023 facility	Dec. 31, 2023 USD ($) facility agreement fuel_station	Dec. 31, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		$ 251,149	$ 230,657
Lease revenue		4,959	4,874
Total revenues		$ 256,108	235,531
Fuel Purchasing Agreements
Disaggregation of Revenue [Line Items]
Number of agreements \| agreement		22
Renewable power sales
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		$ 33,648	33,881
Third party construction
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		49,318	49,458
Service
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		16,711	16,449
Brown gas sales
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		19,587	38,356
Environmental credits
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		126,573	86,901
Environmental credits \| Non-US
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		16,325	3,114
Parts sales
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		4,680	4,391
Operating agreements
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		0	893
Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		$ 632	$ 328
RNG fuel
Disaggregation of Revenue [Line Items]
Number of fuel stations \| fuel_station		2
Number of facilities \| facility	3	2

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income	$ 127,024	$ 32,579
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Income from equity method investments	(5,525)	(5,784)
Distributions from equity method investments	12,242	0
Loss on exchange of Warrants	338	3,368
Depreciation and amortization	14,044	13,015
Amortization of deferred financing costs	1,720	1,943
Amortization of operating lease right-of-use assets	643	770
Loss on extinguishment	2,190	0
Accretion expense related to asset retirement obligation	521	121
Stock-based compensation	5,904	1,469
Provision for bad debts	518	499
Paid-in-kind interest income	(360)	(286)
Change in fair value of Convertible Note Payable	1,579	413
Change in fair value of the earnout liabilities	(6,890)	(37,111)
Unrealized gain on derivative financial instruments	(270)	3,867
Gain on repayment of Note receivable	0	(1,943)
Gain on deconsolidation of VIEs	(122,873)	0
Changes in operating assets and liabilities:
Accounts receivable	2,942	(6,191)
Accounts receivable, related party	(6,275)	(12,421)
Proceeds received on previously recorded paid-in-kind interest income	0	288
Fuel tax credits receivable	(1,201)	(1,751)
Capital spares	(25)	(418)
Parts inventory	(2,880)	(2,168)
Environmental credits held for sale	1,502	(1,288)
Prepaid expense and other current assets	2,200	(3,108)
Contract assets	2,981	(1,287)
Accounts payable	6,686	10,143
Accounts payable, related party	1,228	1,180
Fuel tax credits payable	1,238	1,342
Accrued payroll	66	127
Accrued expenses	3,273	3,237
Operating lease liabilities - current and non-current	(613)	(640)
Asset retirement obligations	(49)	0
Other current and non-current liabilities	(1,910)	452
Contract liabilities	(1,699)	(1,772)
Net cash provided by (used in) operating activities	38,269	(1,355)
Cash flows from investing activities:
Purchase of property, plant, and equipment	(113,826)	(131,410)
Deconsolidation of VIEs, net of cash	(11,947)	0
Proceeds (purchase) of short term investments	55,101	(64,976)
Cash paid for investment in other entities	(8,314)	(597)
Proceeds received from repayment of Note receivable	0	10,855
Distributions received from equity method investment	4,839	2,100
Net cash used in investing activities	(74,147)	(184,028)
Cash flows from financing activities:
Proceeds from Sunoma loan	0	4,593
Proceeds from OPAL Term Loan	196,617	40,000
Proceeds received from Business Combination	0	138,850
Financing costs paid to other third parties	(10,264)	(8,321)
Repayment of Senior Secured Credit Facility	(22,750)	(58,603)
Repayment of Convertible Note Payable	(30,107)	0
Repayment of OPAL Term Loan	(106,090)	(18,910)
Repayment of Sunoma Loan	(546)	0
Repayment of Municipality loan	(76)	(202)
Repayment of finance lease liabilities	(993)	0
Proceeds from equipment loan	303	0
Proceeds from sale of non-redeemable non-controlling interest, related party	12,753	23,143
Reimbursement of financing costs by joint venture partner	842	0
Payment of paid-in-kind preferred dividends	(16,536)	0
Cash paid for taxes related to net share settlement of equity awards	(896)	0
Cash paid for purchase of shares upon exercise of put option	(16,391)	0
Distribution to non-redeemable non-controlling interest	(333)	0
Proceeds from issuance of shares of Class A common stock under the ATM program, net	366	0
Proceeds from issuance of redeemable preferred non-controlling interests, related party	0	100,000
Contributions from members	0	0
Net cash provided by financing activities	5,899	220,550
Net (decrease) increase in cash, restricted cash, and cash equivalents	(29,979)	35,167
Cash, restricted cash, and cash equivalents, beginning of period	77,221	42,054
Cash, restricted cash, and cash equivalents, end of period	47,242	77,221
Supplemental disclosure of cash flow information
Interest paid, net of $5,475 and $3,678 capitalized, respectively	6,929	7,013
Noncash investing and financing activities:
Fair value of Class A common stock issued for redemption of Convertible Note Payable	0	30,595
Fair value of Class A common stock issued for redemption of Public and Private warrants	338	25,919
Fair value of Derivative warrant liabilities assumed related to Business Combination	0	13,524
Fair value of Earnout liabilities related to Business Combination	0	45,900
Fair value of put option on a forward purchase agreement related to Business Combination	0	4,600
Paid-in-kind dividend on redeemable preferred non-controlling interests	2,617	7,932
Right-of-use assets for finance leases included in Property, Plant and equipment, net	9,048	801
Lease liabilities for finance leases included in Accrued expenses and other current liabilities	1,398	316
Lease liabilities for finance leases included in Other long-term liabilities	7,388	485
Accrual for purchase of Property, plant and equipment included in Accounts payable and Accrued capital expenses	$ 15,128	$ 11,922

Investments in Other Entities (Tables)

12 Months Ended

Dec. 31, 2023

Equity Method Investments and Joint Ventures [Abstract]

Summary of Equity Method Investments

The following table shows the movement of Investment in other entities:


	Pine Bend			Noble Road			GREP			SJI			Paragon			Total
Percentage of ownership	50		%	50		%	20		%	50		%	50		%

Balance at December 31, 2021	$	21,188		$	24,516		$	1,446		$	—		$	—		$	47,150
Additional investment representing capitalized interest	597			—			—			—			—			597
Other comprehensive income	—			—			334			—			—			334
Net income from equity method investments	733			2,749			2,302			—			—			5,784
Distributions from return of investment in equity method investment (2)	—			(2,100)			—			—			—			(2,100)
Balance at December 31, 2022	22,518			25,165			4,082			—			—			51,765
Deconsolidation of Emerald and Sapphire	—			—			—			—			34,662			34,662
Deconsolidation of deferred financing costs and capitalized interest	—			—			—			—			1,383			1,383
Net income from equity method investment	4,333			5,642			(1,212)			(547)			364			8,580
Reclassification of adjustments into earnings	—			—			(334)			—			—			(334)
Contribution by the Company	—			—			—			2,114			6,200			8,314
Distributions from return on investment in equity method investment (1)	(5,066)			(6,291)			(521)			—			(364)			(12,242)
Distributions from return of investment in equity method investment (2)	(459)			(1,159)			—			—			(3,221)			(4,839)
Accumulated other comprehensive loss	—			—			—			—			(8)			(8)
Gain on deconsolidation of Emerald and Sapphire (3)	—			—			—			—			122,873			122,873
Amortization of basis difference (4)	(264)			(1,183)			—			—			(1,608)			(3,055)
	$	21,062		$	22,174		$	2,015		$	1,567		$	160,281		$	207,099

(1) Recorded as part of cash flows from operating activities for the year ended December 31, 2023.

(2) Recorded as part of cash flows from investing activities for the years ended December 31, 2023 and 2022.

(3) Recorded as part of Other income in our consolidated statement of operations for the year ended December 31, 2023.

(4) Reflected in Income from equity method investments in the consolidated statement of operations for the year ended December 31, 2023.

The following table summarizes financial information of the unconsolidated entities:


	December 31, 2023		December 31, 2022
Current assets	$	25,114	$	14,563
Non-current assets	171,633		109,414
Current liabilities	26,205		6,765
Non-current liabilities	34,021		13,825
Members' equity	136,521		103,388

The following table summarizes the income from equity method investments:


	Twelve Months Ended
		December 31, 2023		December 31, 2022
Revenue (1)		$	50,074	$	58,013
Gross profit		12,065		41,932
Net income		6,323		29,983

Net income from equity method investments (2)		$	5,525	$	5,784

(1) Revenues for the year ended December 31, 2022 include a realized gain of $32,796 from commodity swap contracts on our equity method investment, GREP for the year ended December 31, 2022.

(2) Net income from equity method investments represents our portion of the net income from equity method investments.

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Expected income tax at statutory rate	$ 26,639	$ 6,884
State income taxes, net of federal	0	184
Gain on deconsolidation of entities	(25,803)	0
Earnings attributable to non-controlling interest	(1,063)	(6,172)
Change in valuation allowance	140	(896)
Other	87	0
Total tax expense - continuing operations	$ 0	$ 0

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Outstanding Restricted Stock Units

A summary of the equity awards under the 2022 Plan for the year ended December 31, 2023 is as follows:


	Restricted stock units	Weighted average fair value per restricted unit on grant date		Aggregate fair value		Vesting terms
Restricted Stock Units:
Unvested restricted stock units outstanding as of December 31, 2022	422,349	$	7.94			100% vesting on October 3, 2023
Granted in March 2023	1,024,414	6.97				Three equal installments vesting over 3 years
Granted in June 2023	13,933	7.38				100% vesting on June 28,2024
Vested during 2023	(280,928)	7.94
Withheld for settlement of taxes	(123,397)	7.94
Forfeitures during 2023	(106,435)	7.19
Unvested restricted stock units outstanding at December 31, 2023	949,936	$	6.98	$	6,627
Stock Options:
Unvested awards as of December 31, 2022	—	—
Granted in March 2023	196,961	5.26				Three equal installments vesting over 3 years
Forfeitures during 2023	(21,071)	5.26
Unvested Stock Options at December 31, 2023	175,890	$	5.26	$	925
Performance Stock Units:
Unvested awards as of December 31, 2022	—	—
Granted in March 2023	274,617	6.97				100% vesting on March 31, 2026
Vested during 2023	(83)	6.97
Shares withheld for settlement of taxes	(31)	6.97
Forfeitures	(34,823)	6.97
Performance Stock Units outstanding as of December 31, 2023	239,680	$	6.97	$	1,671
Total unvested awards outstanding as of December 31, 2023	1,365,506	$	6.75	$	9,223

Stock-based Compensation Expense

The stock-based compensation expense for the above stock awards under the 2022 Plan as well as Parent Equity Awards is included in the selling, general and administrative expenses:


	Twelve Months Ended December 31,
	2023		2022
2022 Plan	$	5,264	$	830
Parent Equity Awards	639		639
	$	5,903	$	1,469

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Schedule of Cash, Cash Equivalents and Restricted Cash

Cash, cash equivalents, and restricted cash consisted of the following as of December 31, 2023 and December 31, 2022:


	December 31, 2023		December 31, 2022
Current assets:
Cash and cash equivalents	$	38,348	$	40,394
Restricted cash - current (1)	4,395		32,402
Long-term assets:
Restricted cash held as collateral (2)	4,499		4,425
Total cash, cash equivalents, and restricted cash	$	47,242	$	77,221

(1) Restricted cash - current as of December 31, 2023 primarily consists of debt reserve on Sunoma Loan. Restricted cash - current as of December 31, 2022 consists of (i) $16,849 held in escrow to secure the Company's purchase obligations under the forward purchase agreement with Meteora (ii) $5,845 equity contribution to a joint venture in connection with the closing of OPAL Term Loan II (iii) $1,127 relates to interest reserve on Sunoma Loan and (iv) $8,581 held in a restricted account for funding one of our RNG projects.

(2) Restricted cash held as collateral represents the collateral requirements on our debt facilities.

Schedule of Cash, Cash Equivalents and Restricted Cash

Cash, cash equivalents, and restricted cash consisted of the following as of December 31, 2023 and December 31, 2022:


	December 31, 2023		December 31, 2022
Current assets:
Cash and cash equivalents	$	38,348	$	40,394
Restricted cash - current (1)	4,395		32,402
Long-term assets:
Restricted cash held as collateral (2)	4,499		4,425
Total cash, cash equivalents, and restricted cash	$	47,242	$	77,221

(2) Restricted cash held as collateral represents the collateral requirements on our debt facilities.

Project Development and Startup Costs

The following table provides information on the types of expenses classified under this expense category:


	Twelve Months Ended December 31,
	2023		2022
Site lease expenses	$	1,021	$	1,000
Legal and professional fees	1,141		124
Royalties	833		1,444
Virtual pipeline costs (1)	1,295		3,200
Management services (2)	237		109
Other	339		561
Total Project development and startup costs (3)	$	4,866	6,438

(1) Virtual pipeline costs for the year ended December 31, 2023 relate to New River and Prince William. For the year ended December 31, 2022, they relate to New River which came online in May 2022.

(2) Relates to charges billed to the individual projects by Fortistar. See Note. 10 Related parties for additional information.

(3) Excludes 1,454 of expenses for the year ended December 31, 2023 incurred on our equity method investment entities which are not consolidated.

Changes in the Asset Retirement Obligation

The changes in the asset retirement obligations were as follows as of December 31, 2023:


	December 31, 2023
Balance, December 31, 2022	$	6,256
Payment of Asset retirement obligations during the year	(49)
Accretion expense	521
Total asset retirement obligation	6,728
Less: current portion	(3,860)
Total asset retirement obligation, net of current portion	$	2,868

Disaggregation of Revenue By Product Line

The following table shows the disaggregation of revenue according to product line:


	Twelve Months Ended December 31,
	2023		2022
Renewable power sales	$	33,648	$	33,881
Third party construction	49,318		49,458
Service	16,711		16,449
Brown gas sales	19,587		38,356
Environmental credits (1)	126,573		86,901
Parts sales	4,680		4,391
Operating agreements	—		893
Other	632		328
Total revenue from contracts with customers	251,149		230,657
Lease revenue (2)	4,959		4,874
Total revenue	$	256,108	$	235,531

(1) Includes revenues of $16,325 and $3,114 for the years ended December 31, 2023 and 2022, from customers domiciled outside of United States.

(2) Lease revenue relates to approximately twenty-two fuel purchasing agreements our of which we have two of our RNG fuel stations with minimum take or pay provisions and revenue from power purchase agreements at two of our Renewable Power facilities where we determined that we transferred the right to control the use of the power plant to the purchaser.

Schedule of Other Income

The following table shows the items consisting of items recorded as Other income:


	Twelve Months Ended December 31,
	2023		2022
Gain on deconsolidation of VIEs (1)	$	122,873	$	—
Gain on redemption of Note receivable	—		1,943
Gain on transfer of non-financial asset in exchange for services received (2)	1,599		—
Other income	$	124,472	$	1,943

(1) Represents non-cash gain on deconsolidation of Emerald and Sapphire on May 30, 2023.

(2) Represents the fair value of RINs transferred as consideration for services received.

Receivables, Contract Assets and Contract Liabilities From Contracts With Customers

The following table provides information about receivables, contract assets, and contract liabilities from contracts with customers:


	December 31, 2023		December 31, 2022
Accounts receivable, net	$	27,623	$	31,083
Contract assets:
Cost and estimated earnings in excess of billings	$	4,630	$	7,027
Accounts receivable retainage, net	2,160		2,744
Contract assets total	$	6,790	$	9,771
Contract liabilities:
Billings in excess of costs and estimated earnings	$	6,314	$	8,013
Contract liabilities total	$	6,314	$	8,013

Useful Lives of Property, Plant and Equipment, Net

Depreciation is computed using the straight-line method over the estimated useful lives of the assets as follows:


Plant and equipment						5 - 30 years
CNG/RNG fueling stations						10-20 years
Construction in progress						N/A
Buildings						40 years
Land						N/A
Service equipment						5-10 years
Leasehold improvements						shorter of lease term or useful life
Vehicles						7 years
Office furniture and equipment						5-7 years
Computer software						3 years
Land lease - finance lease						Lease term
Vehicles - finance lease						shorter of lease term or useful life
Other						7 years

Property, plant, and equipment, net, consisted of the following as of December 31, 2023 and December 31, 2022:


	December 31, 2023		December 31, 2022
Plant and equipment	$	205,188	$	201,655
CNG/RNG fueling stations	51,749		34,567
Construction in progress (1)	175,060		152,105
Buildings	2,585		2,585
Land	1,303		1,303
Service equipment	2,481		1,888
Leasehold improvements	815		815
Vehicles	489		313
Office furniture and equipment	307		307
Computer software	277		277
Land Lease - finance lease	6,469		—
Vehicles - finance leases	2,580		1,236
Other	591		487
	449,894		397,538
Less: accumulated depreciation	(110,401)		(100,215)
Property, plant, and equipment, net	$	339,493	$	297,323

(1) Includes $5,475 of interest capitalized from our general borrowings for the year ended December 31, 2023 and $3,678 for the year ended December 31, 2022.

Intangible Assets, Net

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets, Net

Intangible assets, net, consisted of the following at December 31, 2023 and December 31, 2022:


	December 31, 2023
	Cost		Accumulated Amortization		Intangible Assets, Net		Weighted Average Amortization Period (Years)
Power purchase agreements	$	8,999	$	(7,926)	$	1,073	18.1
Transmission/distribution interconnection	1,600		(1,076)		524		15.1
Intellectual property	43		(36)		7		5.0
Total intangible assets	$	10,642	$	(9,038)	$	1,604


	December 31, 2022
	Cost		Accumulated Amortization		Intangible Assets, Net		Weighted Average Amortization Period (years)
Power purchase agreements	$	8,999	$	(7,488)	$	1,511	18.1
Transmission/distribution interconnection	1,600		(971)		629		15.1
CNG sales contract	807		(799)		8		10.0
Intellectual property	43		(24)		19		5.0
Total intangible assets	$	11,449	$	(9,282)	$	2,167

Amortization expense for the twelve months ended December 31, 2023 and 2022 was $563 and $694, respectively. At December 31, 2023, estimated future amortization expense for intangible assets is as follows:


Fiscal year:
2024	267
2025	267
2026	239
2027	238
Thereafter	593
	$	1,604

Summary of Significant Accounting Policies - Intangible Assets, Significant Customers, Vendors and Concentration of Credit Risk Narrative (Details)	12 Months Ended
	Dec. 31, 2023 agreement contract interconnection	Dec. 31, 2022 agreement
Finite-Lived Intangible Assets [Line Items]
Number of electricity forward sales agreements	2	2
Accounts Payable \| Supplier Concentration Risk \| One Vendor
Finite-Lived Intangible Assets [Line Items]
Concentration risk percentage	32.00%	19.00%
Two Customers \| Revenue Benchmark \| Customer Concentration Risk
Finite-Lived Intangible Assets [Line Items]
Concentration risk percentage	47.00%	49.00%
Two Customers \| Accounts Receivable \| Customer Concentration Risk
Finite-Lived Intangible Assets [Line Items]
Concentration risk percentage	54.00%	45.00%
Power purchase agreements
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	18 years 1 month 6 days	18 years 1 month 6 days
Number of intangible assets	3
CNG sales contract
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)		10 years
Number of intangible assets \| contract	1
Transmission/distribution interconnection
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	15 years 1 month 6 days	15 years 1 month 6 days
Number of intangible assets \| interconnection	1
Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	20 years
Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Years)	5 years

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Revenues:

Total revenues

$ 256,108

$ 235,531

Operating expenses:

Research and Development Expense

4,866

6,438

Selling, general, and administrative

51,262

51,386

Depreciation, amortization, and accretion

14,565

13,136

Income from equity method investments

(5,525)

(5,784)

Total expenses

249,068

227,968

Operating income

7,040

7,563

Interest and financing expense, net

(9,306)

(6,640)

Change in fair value of derivative instruments, net

7,346

33,081

Other income

124,472

1,943

Loss on debt extinguishment

(2,190)

Loss on warrant exchange

(338)

(3,368)

Income before provision for income taxes

127,024

32,579

Provision for income taxes

Net income

127,024

32,579

Net income attributable to redeemable non-controlling interests

97,426

22,409

Net loss attributable to non-redeemable non-controlling interests

(349)

(1,153)

Dividends on Redeemable preferred non-controlling interests

^[1]

11,011

7,932

Net income attributable to Class A common stockholders

$ 18,936

$ 3,391

Weighted average shares outstanding of Class A common stock :

Basic (in shares)

27,148,538

25,774,312

Diluted (in shares)

27,494,016

26,062,398

Per share amounts:

Basic (in dollars per share)

$ 0.70

$ 0.13

Diluted (in dollars per share)

$ 0.69

$ 0.12

RNG Fuel

Revenues:

Total revenues

$ 66,292

$ 73,158

Operating expenses:

Cost of sales

32,028

32,367

RNG Fuel | Related Party

Revenues:

Total revenues

56,069

58,185

Fuel Station Services

Revenues:

Total revenues

135,012

117,415

Operating expenses:

Cost of sales

115,322

98,845

Fuel Station Services | Related Party

Revenues:

Total revenues

28,468

18,735

Renewable Power

Revenues:

Total revenues

54,804

44,958

Operating expenses:

Cost of sales

36,550

31,580

Renewable Power | Related Party

Revenues:

Total revenues

$ 6,614

$ 5,495

[1]

Paid-in-kind preferred dividend is allocated between redeemable non-controlling interests and Class A common stockholders basis their weighted average percentage of ownership. Please see Note 13. Redeemable non-controlling interests, Redeemable preferred non-controlling interests and Stockholders' Equity for additional information.

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Investment in partnership	$ 25,133	$ 26,637
163j interest limitation	608	109
Federal NOL carryforward	1,165	3,094
State NOL carryforward	785	677
Total deferred tax assets	27,691	30,517
Valuation allowance for deferred tax assets	(27,691)	(30,517)
Deferred tax assets, net of valuation allowance	0	0
Deferred tax liabilities:
Total deferred tax liabilities	0	0
Net deferred income tax asset or liability	$ 0	$ 0

Summary of Significant Accounting Policies - Useful Lives of Property, Plant and Equipment, Net (Details)	Dec. 31, 2023
Plant and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Useful lives (in years)	5 years
Plant and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Useful lives (in years)	30 years
CNG/RNG fueling stations \| Minimum
Property, Plant and Equipment [Line Items]
Useful lives (in years)	10 years
CNG/RNG fueling stations \| Maximum
Property, Plant and Equipment [Line Items]
Useful lives (in years)	20 years
Buildings
Property, Plant and Equipment [Line Items]
Useful lives (in years)	40 years
Service equipment \| Minimum
Property, Plant and Equipment [Line Items]
Useful lives (in years)	5 years
Service equipment \| Maximum
Property, Plant and Equipment [Line Items]
Useful lives (in years)	10 years
Vehicles
Property, Plant and Equipment [Line Items]
Useful lives (in years)	7 years
Office furniture and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Useful lives (in years)	5 years
Office furniture and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Useful lives (in years)	7 years
Computer software
Property, Plant and Equipment [Line Items]
Useful lives (in years)	3 years
Other
Property, Plant and Equipment [Line Items]
Useful lives (in years)	7 years

Related Parties - Narrative (Details) $ in Thousands				1 Months Ended	8 Months Ended	12 Months Ended
Related Parties - Narrative (Details) $ in Thousands	Oct. 10, 2023 USD ($)	Nov. 29, 2021 USD ($) subsidiary shares	Dec. 31, 2020 USD ($)	Aug. 31, 2021 USD ($) shares	Mar. 31, 2021	Dec. 31, 2023 USD ($) commodity_swap	Dec. 31, 2022 USD ($) commodity_swap shares
Related Party Transaction [Line Items]
Paid-in-kind dividends issued and outstanding units						$ 8,421	$ 5,406
Accrued preferred dividend payable						2,013	5,406
Stock subscribed (in shares) \| shares		1,000,000
Amount sold							$ 100,000
Stock issued (in shares) \| shares							1,000,000
Total revenues						256,108	$ 235,531
Income from equity method investments						5,525	5,784
Selling, general, and administrative						51,262	51,386
Renewable Power
Related Party Transaction [Line Items]
Total revenues						$ 54,804	$ 44,958
Commodity swap contracts
Related Party Transaction [Line Items]
Number of derivative instruments held \| commodity_swap						3	3
Reynolds
Related Party Transaction [Line Items]
Percentage of ownership interest acquired				100.00%
Cash payments				$ 12,020
Parent Company \| Fortistar \| Administrative Services Agreement
Related Party Transaction [Line Items]
Written notice of termination period (in days)			180 days
Service fees per year			$ 580
Related Party \| Renewable Power
Related Party Transaction [Line Items]
Total revenues						$ 6,614	$ 5,495
Related Party \| Hillman
Related Party Transaction [Line Items]
Common units, shares issued (in shares) \| shares		14
Total consideration from related parties		$ 30,000
Related Party \| Reynolds \| GREP
Related Party Transaction [Line Items]
Cash consideration				$ 1,570
Related Party \| Pine Bend, Sunoma And Noble Road \| Environmental Processing Fees
Related Party Transaction [Line Items]
Total revenues						2,615	709
Term of related party contract (in years)					10 years
Related Party \| Fortistar \| Interim Services Agreement
Related Party Transaction [Line Items]
Monthly fee, maximum	$ 50,000
Selling, general, and administrative						$ 128
GREP
Related Party Transaction [Line Items]
Percentage of ownership				20.00%		20.00%
Income from equity method investments						$ (1,212)	2,302
GREP \| BioTown Biogas LLC (“Biotown”)
Related Party Transaction [Line Items]
Percentage of ownership				50.00%
RNG fuel \| NextEra
Related Party Transaction [Line Items]
Minimum of environmental attributes to be sold, percentage		90.00%
RNG fuel \| Hillman \| Related Party
Related Party Transaction [Line Items]
Number of noncontrolling interests in renewable natural gas project subsidiaries \| subsidiary		4
Natural Gas, Renewable And Fuel Station Services \| Related Party \| NextEra
Related Party Transaction [Line Items]
Total revenues						84,537	76,920
Series A-1 preferred units \| Related Party \| Hillman
Related Party Transaction [Line Items]
Preferred units, shares issued (in shares) \| shares		300,000
Paid-in-kind dividends issued and outstanding units						2,590	2,526
Accrued preferred dividend payable						$ 604	$ 2,526
Common Class B \| Related Party \| Reynolds \| GREP
Related Party Transaction [Line Items]
Equity investment held (in shares) \| shares				1,570
Common Class B \| Reynolds \| GREP \| Related Party \| GREP
Related Party Transaction [Line Items]
Percentage of ownership				20.00%

Reportable Segments and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Schedule of Total Revenues by Segment


	Twelve Months Ended December 31,
	2023		2022
Revenues:
Renewable Power	$	54,804	$	47,210
RNG Fuel	115,526		141,903
Fuel Station Services	149,408		117,735
Other (1)	840		131
Intersegment	(14,396)		(13,435)
Equity Method Investment(s)	(50,074)		(58,013)
	$	256,108	$	235,531

____________

(1) Other includes revenues of management fee revenues earned from operations and management of unconsolidated entities and Fortistar Contracting LLC.

Schedule of Interest Expense on Borrowings, Depreciation, Amortization and Accretion and Cash Paid for Purchases, Plant and Equipment


	Twelve Months Ended December 31,
	2023		2022
Interest and Financing Expense, Net:
Renewable Power	$	(280)	$	(5,261)
RNG Fuel	(9,324)		(899)
Fuel Station Services	134		—
Corporate	(192)		(480)
Equity Method Investment(s)	356		—
	$	(9,306)	$	(6,640)


	Twelve Months Ended December 31,
	2023		2022
Depreciation, Amortization, and Accretion:
Renewable Power	$	5,567	$	5,696
RNG Fuel	7,770		8,542
Fuel Station Services	3,730		846
Other(1)	—		125
Equity Method Investment(s)	(2,502)		(2,073)
	$	14,565	$	13,136

(1)Other includes amortization of intangible assets and depreciation expense not allocated to any segment.


	Twelve Months Ended December 31,
	2023		2022
Cash paid for Purchases of Property, Plant, and Equipment:
Renewable Power	$	—	$	2,001
Fuel Station Services	17,182		7,565
RNG Fuel	96,692		121,844
	$	113,874	$	131,410

Schedule of Net Income


	Twelve Months Ended December 31,
	2023		2022
Net income (loss):
Renewable Power	$	12,472	$	4,681
RNG Fuel	16,678		26,330
Fuel Station Services	17,908		18,245
Corporate	74,441		(22,461)
Equity Method Investment(s)	5,525		5,784
	$	127,024	$	32,579

Total Assets


	December 31, 2023		December 31, 2022
Total Assets:
Renewable Power	$	37,479	$	43,468
RNG Fuel	342,176		376,933
Fuel Station Services	152,625		90,486
Corporate and other	15,230		82,204
Equity Method Investment(s)	207,099		51,765
	$	754,609	$	644,856

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On March 5, 2024, Paragon RNG LLC, a joint venture between OPAL Fuels Inc. and a third-party environmental solutions company (“Paragon”), as the Borrower, certain indirect subsidiaries of the Borrower as guarantors (the “Guarantors”), the lenders party thereto and Bank of Montreal as the administrative agent (the “Administrative Agent”) entered into the First Amendment to Amended and Restated Credit and Guaranty Agreement (the “Credit Agreement Amendment”), and Paragon, the Administrative Agent and Wilmington Trust, National Association as collateral and depositary agent entered into the First Amendment to Depositary Agreement (the “Depositary Agreement Amendment”), with respect to the Amended and Restated Credit and Guaranty Agreement (the “Credit Agreement”) and Depositary Agreement (the “Depositary Agreement”) entered into on May 30, 2023. The Credit Agreement Amendment reclassifies the debt service reserve facility (the “DSR Facility”) under the Credit Agreement as a revolving loan facility of up to a maximum aggregate principal amount of $10.0 million (the “Revolving Loan Facility”) on substantially the same terms as the DSR Facility, with the proceeds of the Revolving Loan Facility to be used primarily to satisfy the balance to be maintained in the debt service reserve account. The Credit Agreement Amendment extends the outside date (the “Conversion Date”) for completion of construction of the Emerald RNG LLC (“Emerald”) and Sapphire RNG LLC (“Sapphire”) projects from June 30, 2024 to December 1, 2024, and requires the Borrower, prior to the Conversion Date, to maintain a debt service coverage ratio with respect to the Emerald project (the “Pre-Term Conversion Debt Service Coverage Ratio”) of not less than 1.2:1.0, as tested on a trailing four fiscal quarters basis as of the last day of each fiscal quarter commencing as of the effective date of the Credit Agreement Amendment. Availability under the Credit Agreement’s delayed term loan facility (the “DDTL Facility”) has been reduced from a maximum aggregate principal amount of $85.0 million to approximately $81.0 million to account for DDTL Facility borrowings under the Credit Agreement to date, and with certain exceptions, the DDTL Facility borrowings are no longer available for project costs related to the Emerald project. The Credit Agreement Amendment and the Depositary Agreement Amendment together require prepayments of principal in the amount of $2.0 million each on the last business day of each fiscal quarter in 2024, and to the extent funds are available on such dates, additional prepayments in the amounts of $2.5 million, $6.0 million, $10.0 million and $15.0 million (each a “Target Aggregate Special Principal Prepayment Amount”), respectively, in each case net of the prepayments already paid as of such date since January 1, 2024. As a condition precedent to making certain restricted payments, all mandatory prepayments made in 2024, in the aggregate, must meet or exceed the Target Aggregate Special Principal Prepayment Amount for such fiscal quarter, and the Pre-Term Conversion Debt Service Coverage Ratio must be greater than or equal to 1.4:1.0 as of the last day of the fiscal quarter immediately preceding the proposed date of such restricted payment. The Credit Agreement Amendment and the Depositary Agreement Amendment are subject to a $150,000 amendment fee paid at closing of such amendments. On March 12, 2024, Fortistar, through its subsidiary OPAL Holdco, converted 71.5 million shares of Class D common stock of the Company held by it, each of which is entitled to five votes per share on all matters on which stockholders generally are entitled to vote, for an equal number of shares of newly issued Class B common stock of the Company, each of which is entitled to one vote on such matters. This transaction has no effect on the economic interest in the Company held by Fortistar or OPAL Holdco. Fortistar converted such shares in order that the Company’s Class A common stock would become eligible for inclusion in certain stock market indices, on which many broad-based mutual funds and exchange-traded index funds are based. There can be no assurance that the Company’s Class A common stock will be included in any stock market index as a result of the share conversion, or that if the Company’s Class A common stock is included in any such index, that the price per share of the Company’s Class A common stock will be positively affected. Post this exchange, Fortistar holds 72,899,037 shares of Class D common stock and 71,500,000 shares of Class B common stock.

Stock-based Compensation

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Stock-based Compensation

2022 Omnibus Equity Incentive Plan

The Company adopted 2022 Omnibus Equity Incentive Plan (the "2022 Plan") in 2022 which was approved by our shareholders on July 21, 2022. The purposes of the 2022 Plan are to (i) provide an additional incentive to selected employees, directors, and independent contractors of the Company or its Affiliates whose contributions are essential to the growth and success of the Company, (ii) strengthen the commitment of such individuals to the Company and its Affiliates, (iii) motivate those individuals to faithfully and diligently perform their responsibilities and (iv) attract and retain competent and dedicated individuals whose efforts will result in the long-term growth and profitability of the Company. The 2022 Plan allows for granting of stock options, stock appreciation rights, restricted stock, restricted stock units and other stock-based awards. The Company registered 19,811,726 shares of Class A common stock that can be issued under this Plan.

On March 31, 2023, the Company issued 196,961 stock options, 888,831 restricted stock units and 274,617 performance units to certain employees of the Company. The fair value of the stock options was determined to be $5.26 based on Black Scholes model based on the share price of $6.97, exercise price of $6.97, expiration of 10 years, annual risk free interest rate of 4.04% and volatility of 65%. The performance units were contingent upon Company achieving certain Adjusted EBITDA and production targets. The grant date fair value of these awards was estimated using the closing share price of the Company's stock on the date of the grant and the compensation cost related to these awards is recognized based on the relative satisfaction of the performance condition as of the reporting date. Additionally, the Company issued 135,583 restricted stock units to the board of directors. The total fair value of the equity awards was $6,955.

A summary of the equity awards under the 2022 Plan for the year ended December 31, 2023 is as follows:


	Restricted stock units	Weighted average fair value per restricted unit on grant date		Aggregate fair value		Vesting terms
Restricted Stock Units:
Unvested restricted stock units outstanding as of December 31, 2022	422,349	$	7.94			100% vesting on October 3, 2023
Granted in March 2023	1,024,414	6.97				Three equal installments vesting over 3 years
Granted in June 2023	13,933	7.38				100% vesting on June 28,2024
Vested during 2023	(280,928)	7.94
Withheld for settlement of taxes	(123,397)	7.94
Forfeitures during 2023	(106,435)	7.19
Unvested restricted stock units outstanding at December 31, 2023	949,936	$	6.98	$	6,627
Stock Options:
Unvested awards as of December 31, 2022	—	—
Granted in March 2023	196,961	5.26				Three equal installments vesting over 3 years
Forfeitures during 2023	(21,071)	5.26
Unvested Stock Options at December 31, 2023	175,890	$	5.26	$	925
Performance Stock Units:
Unvested awards as of December 31, 2022	—	—
Granted in March 2023	274,617	6.97				100% vesting on March 31, 2026
Vested during 2023	(83)	6.97
Shares withheld for settlement of taxes	(31)	6.97
Forfeitures	(34,823)	6.97
Performance Stock Units outstanding as of December 31, 2023	239,680	$	6.97	$	1,671
Total unvested awards outstanding as of December 31, 2023	1,365,506	$	6.75	$	9,223

Parent Equity Awards

During the years ended December 31, 2020 and 2019, Fortistar granted certain equity-based awards to certain employees of the Company in the form of residual equity interests (“Profit Interests”) in four wholly-owned subsidiaries of the Company. The Profit Interests do not have voting rights and shall participate in the income distributions when the subsidiaries achieve certain financial targets. These Profits Interests were restructured in December 2020, at which time they became based on a portion of Fortistar's indirect ownership in the Company, rather than in Fortistar's ownership interest in Company subsidiaries. The percentage of Profit Interests issued in the investment entities that were established to grant the incentive units ranged between 34%-37% in the four wholly-owned subsidiaries. These Profit Interests vest ratably over a period of five years from the grant date.

There were no new residual equity interest grants during the year ended December 31, 2023.

As of December 31, 2023, 86% of the Profit Interests issued vested and there were 14% of Profit Interests unvested. There were no forfeitures during the year ended December 31, 2023.

As of December 31, 2022, 66% of the Profit Interests issued vested and there were 34% of Profit Interests unvested.

The stock-based compensation expense for the above stock awards under the 2022 Plan as well as Parent Equity Awards is included in the selling, general and administrative expenses:


	Twelve Months Ended December 31,
	2023		2022
2022 Plan	$	5,264	$	830
Parent Equity Awards	639		639
	$	5,903	$	1,469

Stock-based compensation expense related to unvested awards yet to be recognized as of December 31, 2023 totaled $6,308 and is expected to be recognized, on a weighted average basis, over 2.3 years.

The future compensation to be recognized for the Parent Equity Awards as of December 31, 2023 is $453 and will be recognized the remaining vesting period which ranges from one to two years.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands		12 Months Ended
	May 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Change in fair value of derivative instruments, net		$ 7,346	$ 33,081
Reclassification of adjustments into earnings		$ 334
Interest rate swaps
Change in fair value of derivative instruments, net	$ 812

Investments in Other Entities - Narrative (Details) $ in Thousands				1 Months Ended	12 Months Ended
	Sep. 14, 2023 project	May 30, 2023 USD ($) deconsolidated_entity	Nov. 29, 2021 project	Aug. 31, 2021 USD ($)	Dec. 31, 2023 USD ($) variable_interest_entity	Dec. 31, 2022 USD ($) variable_interest_entity	May 29, 2023 variable_interest_entity
Schedule of Equity Method Investments [Line Items]
Number of noncontrolling interests in renewable natural gas project subsidiaries \| project			4
Number of variable interest entities consolidated \| variable_interest_entity					2	4	2
Capitalized interest		$ 2,765
Number of deconsolidated entities \| deconsolidated_entity		2
Gain on deconsolidation of VIEs					$ 122,873	$ 0
Note receivable - variable fee component					$ 2,302	1,942
Discount rate
Schedule of Equity Method Investments [Line Items]
Discount factor		14.00%
RNG Fuel
Schedule of Equity Method Investments [Line Items]
Number of deconsolidated entities \| deconsolidated_entity		2
NEW JERSEY
Schedule of Equity Method Investments [Line Items]
Number of noncontrolling interests in renewable natural gas project subsidiaries \| project	2
OPAL L2G
Schedule of Equity Method Investments [Line Items]
Percentage of ownership	50.00%
SJI
Schedule of Equity Method Investments [Line Items]
Percentage of ownership	50.00%				50.00%
Gain on deconsolidation of VIEs					$ 0
SJI \| RNG Atlantic
Schedule of Equity Method Investments [Line Items]
Contributions to project subsidiary					$ 2,115
SJI \| NEW JERSEY
Schedule of Equity Method Investments [Line Items]
Percentage of ownership	50.00%
Paragon
Schedule of Equity Method Investments [Line Items]
Percentage of ownership		50.00%			50.00%
Gain on deconsolidation of VIEs					$ 122,873
Paragon \| Emerald And Sapphire
Schedule of Equity Method Investments [Line Items]
Percentage of ownership transferred		50.00%
Reynolds
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest acquired				100.00%
Reynolds
Schedule of Equity Method Investments [Line Items]
Note receivable				$ 10,450
Interest rate of note receivable				12.50%
Percentage of note receivable payable in cash				8.00%
Payment-in-kind interest of equity method investment				4.50%
Percentage of revenue based distributions of note receivable				4.25%
Maximum amount of revenue based distributions over term of debt				$ 4,500
Note receivable - variable fee component				$ 1,538
Decrease in interest and financing expense					$ 413	$ 288

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Letters of Credit As of December 31, 2023 and December 31, 2022, the Company was required to maintain nine standby letters of credit totaling $13,750 and $2,292, respectively, to support obligations of certain Company subsidiaries. These letters of credit were issued in favor of a lender, utilities, a governmental agency, and an independent system operator under PPA electrical interconnection agreements, and in place of a debt service reserve. There have been no draws to date on these letters of credit. Purchase Options The Company has two contracts with customers to provide CNG for periods of seven and ten years, respectively. The customers have an option to terminate the contracts and purchase the Company's CNG Fueling Station at the customers' sites for a fixed amount that declines annually. In July 2015, the Company entered into a ten year fuel sales agreement with a customer that included the construction of a CNG Fueling Station owned and managed by the Company on the customer's premises. At the end of the contract term, the customer has an option to purchase the CNG Fueling Station for a fixed amount. The cost of the CNG Fueling Station was recorded to Property, plant, and equipment and is being depreciated over the contract term. On May 30, 2023, OPAL Intermediate Holdco 2 assigned to Paragon its rights and obligations under the OPAL Term Loan II. Legal Matters The Company is involved in various claims arising in the normal course of business. Management believes that the outcome of these claims will not have a material adverse effect on the Company's financial position, results of operations or cash flows. Set forth below is information related to the Company’s material pending legal proceedings as of the date of this report, other than ordinary routine litigation incidental to the business. Central Valley Project In September 2021, an indirect subsidiary of the Company, MD Digester, LLC, entered into a fixed-price Engineering, Procurement and Construction Contract (an “EPC Contract”) with VEC Partners, Inc. d/b/a CEI Builders (“Contractor”) for the design and construction of a turn-key renewable natural gas production facility using dairy cow manure as feedstock. In December 2021, a second indirect subsidiary of the Company, VS Digester, LLC entered into a nearly identical EPC Contract with Contractor for the design and construction of a second facility in connection with the same project. Contractor has submitted a series of change order requests seeking to increase the EPC Contract price under each contract by approximately $14 million (i.e., approximately $28 million in total), primarily due to modifications to Contractor’s design drawings that are required to meet its contracted performance guaranties and a termination (for default) of one of Contractor’s major equipment manufacturers. The Company disputes substantially all of the change order requests. On January 5, 2024, the Company filed a civil lawsuit captioned, MD Digester, LLC. et. al. vs. VEC Partners, Inc. et. al.; California Superior Court, County of San Joaquin; Action No. STK-CV-UCC-2024-0000185 and commenced a related arbitration proceeding in order to obtain a formal determination on the claims, AAA Case No. 01-24-0000-0775. The Superior Court Action will be stayed, pending an award in the AAA proceeding. The AAA proceeding has not been set for hearing. Contractor is required to select an arbitrator who will in concert with the Company’s selected arbitrator nominate a Chair for the AAA, three-person arbitration panel. As a result of the procedural status of these matters, no discovery has occurred. The EPC Agreement provides that Contractor is obligated to continue working during the course of the litigation and related arbitration proceedings. Contractor’s performance under both of the EPC Contracts is fully bonded by licensed sureties. Despite informal settlement discussions with Contractor, the parties have not been able as of yet to resolve the claims. The Company believes its claims against Contractor have substantial merit, and intends to prosecute its claims vigorously. However, due to the incipient stage of the litigation and related arbitration, its ongoing status, and the uncertainties involved in all litigation and arbitration, the Company does not believe it is feasible at this time to assess the likely outcome of the litigation and related arbitration, the timing of its resolution, or its ultimate impact on the Central Valley projects or the Company's business, financial condition or results of operations.

Derivative Financial Instruments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Liabilities:
Asset retirement obligation	$ 6,728	$ 6,256
Cash and cash equivalents and restricted cash - current and non-current	47,242	77,221	$ 42,054
Fair Value, Recurring
Liabilities:
Asset retirement obligation	6,728	6,256
Convertible Note Payable		28,528
Earnout liabilities	1,900	8,790
Cash and cash equivalents and restricted cash - current and non-current	47,242	77,221
Assets:
Short term investments	9,875	64,976
Fair Value, Recurring \| Money Market Funds
Liabilities:
Cash and cash equivalents and restricted cash - current and non-current	31,965	6,769
Fair Value, Recurring \| Put option with Meteora
Liabilities:
Derivative liabilities		4,466
Fair Value, Recurring \| Commodity swap contracts
Liabilities:
Derivative liabilities		130
Assets:
Derivative assets	633
Fair Value, Recurring \| Swaption asset
Assets:
Derivative assets		182
Fair Value, Recurring \| Interest rate swaps
Assets:
Derivative assets		954
Fair Value, Recurring \| Level 1
Liabilities:
Asset retirement obligation	0	0
Convertible Note Payable		0
Earnout liabilities	0	0
Cash and cash equivalents and restricted cash - current and non-current	47,242	77,221
Assets:
Short term investments	9,875	64,976
Fair Value, Recurring \| Level 1 \| Put option with Meteora
Liabilities:
Derivative liabilities		0
Fair Value, Recurring \| Level 1 \| Commodity swap contracts
Liabilities:
Derivative liabilities		0
Assets:
Derivative assets	0
Fair Value, Recurring \| Level 1 \| Swaption asset
Assets:
Derivative assets		0
Fair Value, Recurring \| Level 1 \| Interest rate swaps
Assets:
Derivative assets		0
Fair Value, Recurring \| Level 2
Liabilities:
Asset retirement obligation	0	0
Convertible Note Payable		28,528
Earnout liabilities	0	0
Cash and cash equivalents and restricted cash - current and non-current	0	0
Assets:
Short term investments	0	0
Fair Value, Recurring \| Level 2 \| Put option with Meteora
Liabilities:
Derivative liabilities		0
Fair Value, Recurring \| Level 2 \| Commodity swap contracts
Liabilities:
Derivative liabilities		130
Assets:
Derivative assets	633
Fair Value, Recurring \| Level 2 \| Swaption asset
Assets:
Derivative assets		182
Fair Value, Recurring \| Level 2 \| Interest rate swaps
Assets:
Derivative assets		954
Fair Value, Recurring \| Level 3
Liabilities:
Asset retirement obligation	6,728	6,256
Convertible Note Payable		0
Earnout liabilities	1,900	8,790
Cash and cash equivalents and restricted cash - current and non-current	0	0
Assets:
Short term investments	0	0
Fair Value, Recurring \| Level 3 \| Put option with Meteora
Liabilities:
Derivative liabilities		4,466
Fair Value, Recurring \| Level 3 \| Commodity swap contracts
Liabilities:
Derivative liabilities		0
Assets:
Derivative assets	$ 0
Fair Value, Recurring \| Level 3 \| Swaption asset
Assets:
Derivative assets		0
Fair Value, Recurring \| Level 3 \| Interest rate swaps
Assets:
Derivative assets		$ 0

Subsequent Events (Details) $ in Millions			12 Months Ended
Subsequent Events (Details) $ in Millions	Mar. 12, 2024 vote_per_share shares	Mar. 05, 2024 USD ($)	Dec. 31, 2023 shares	Mar. 04, 2024 USD ($)	Sep. 01, 2023 USD ($)	Dec. 31, 2022 shares
Subsequent Event [Line Items]
Amendment fee			953
Class D common stock
Subsequent Event [Line Items]
Common stock, shares outstanding (in shares) \| shares			144,399,037			144,399,037
Common Class B
Subsequent Event [Line Items]
Common stock, shares outstanding (in shares) \| shares			0			0
Subsequent Event \| Fortistar \| Class D common stock \| Related Party
Subsequent Event [Line Items]
Common stock, shares exchanged (in shares) \| shares	71,500,000
Number of votes per share (in vote per share) \| vote_per_share	5
Common stock, shares outstanding (in shares) \| shares	72,899,037
Subsequent Event \| Fortistar \| Common Class B \| Related Party
Subsequent Event [Line Items]
Number of votes per share (in vote per share) \| vote_per_share	1
Common stock, shares outstanding (in shares) \| shares	71,500,000
Revolving Credit Facility \| Credit Agreement \| Line of Credit
Subsequent Event [Line Items]
Revolving credit arrangement borrowing capacity					$ 50.0
Paragon \| Credit Agreement Amendment and Depositary Agreement Amendment \| Line of Credit \| Subsequent Event
Subsequent Event [Line Items]
Pre-term conversion debt service coverage ratio		1.4
Payments		$ 2.0
Amendment fee		150,000
Paragon \| Credit Agreement Amendment and Depositary Agreement Amendment \| Line of Credit \| Subsequent Event \| Debt Instrument, Additional Prepayment One
Subsequent Event [Line Items]
Payments		$ 2.5
Paragon \| Credit Agreement Amendment and Depositary Agreement Amendment \| Line of Credit \| Subsequent Event \| Debt Instrument, Additional Prepayment Two
Subsequent Event [Line Items]
Payments		6.0
Paragon \| Credit Agreement Amendment and Depositary Agreement Amendment \| Line of Credit \| Subsequent Event \| Debt Instrument, Additional Prepayment Three
Subsequent Event [Line Items]
Payments		10.0
Paragon \| Credit Agreement Amendment and Depositary Agreement Amendment \| Line of Credit \| Subsequent Event \| Debt Instrument, Additional Prepayment Four
Subsequent Event [Line Items]
Payments		15.0
Paragon \| Revolving Credit Facility \| Credit Agreement Amendment \| Line of Credit \| Subsequent Event
Subsequent Event [Line Items]
Revolving credit arrangement borrowing capacity		$ 10.0
Pre-term conversion debt service coverage ratio		1.2
Paragon \| Secured Debt \| Credit Agreement \| Line of Credit \| Subsequent Event
Subsequent Event [Line Items]
Revolving credit arrangement borrowing capacity		$ 81.0		$ 85.0

Derivative Financial Instruments and Fair Value Measurements

12 Months Ended

Dec. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments and Fair Value Measurements

Interest rate swaps

On May 30, 2023, OPAL Intermediate Holdco 2, assigned to Paragon its rights and obligations under the OPAL Term Loan II. Concurrently, the Company terminated the two interest rate swaps outstanding under this loan and received $812 as settlement from the swap counterparty. Paragon entered into four interest rate swaps for a notional amount of $56,914 at a fixed interest rate of 3.52%. The Company terminated the swaption on the same date.

After the transaction, the Company recognized a gain of $812 in the consolidated statement of operations for the year ended December 31, 2023 as part of Change in fair value of derivative instruments. The Company received $136 as a settlement from the swaption counterparty and recognized $46 as loss on termination of the swaption as part of change in fair value of derivative instruments. Additionally, the Company recognized $(8) as its share of the Accumulated other comprehensive loss from Paragon and decreased its basis in equity method investment on its consolidated balance sheet as of December 31, 2023.

The following table summarizes the interest rate swaps in place as of December 31, 2023 and December 31, 2022:


Interest rate swap detail					Notional Amount
Trade date	Fixed rate		Start date	End date	December 31, 2023		December 31, 2022

August 15, 2022	2.47	%	June 28, 2024	August 4, 2027	$	—	$	41,284
August 15, 2022	2.47	%	June 28, 2024	August 4, 2027	—		20,642
					$	—	$	61,926

The location and amounts of derivatives fair values in the consolidated balance sheets are:


	December 31, 2023		December 31, 2022		Location of Fair Value Recognized in Balance Sheet
Derivatives designated as economic hedges:
Current portion of swaption	$	—	$	182	Derivative financial assets, current portion

Derivatives designated as cash flow hedges:
Non current portion of the interest rate swaps	—		954		Derivative financial assets, non-current portion
	$	—	$	1,136

The effect of interest rate swaps on the consolidated statement of operations were as follows:


	Twelve Months Ended December 31,				Location of (Loss) Gain Recognized in Operations from Derivatives
	2023		2022
Interest rate swaps	$	—	$	992
Swaption	(46)		182
Net periodic settlements - interest rate swaps (1)	1,146		(676)
	$	1,100	$	498	Change in fair value of derivative instruments, net

(1) Includes $334 reclassification into earnings from our equity method investments and $812 reclassification on the gain on termination of interest rate swaps on May 30, 2023.

The following table summarizes the fair value of interest rate swaps on the Company's consolidated balance sheets and the effect of netting arrangements and collateral on its financial position:


	Gross Amounts of Recognized Assets/(Liabilities)		Gross Amounts Offset in the Balance Sheet		Net Amounts of Assets/(Liabilities) in the Balance Sheet
Balance, December 31, 2023:
Interest rate swap asset	$	—	$	—	$	—
Swaption asset	—		—		—
	$	—	$	—	$	—
Balance, December 31, 2022:
Interest rate swap asset	$	954	$	—	$	954
Swaption asset	182		—		182
	$	1,136	$	—	$	1,136

There were no collateral balances with counterparties outstanding as of the period-end dates.

Commodity swap contracts

Additionally, the Company entered into an ISDA agreement with Mendocino Capital LLC (“NextEra”), a related party in November 2019. Pursuant to the agreement, the Company entered into swaps with contract prices ranging between $35.75 and $51.25 per MWh. The swaps expired in December 2022. Upon the expiry of these swaps, the Company entered into two additional commodity swaps in October 2022 for a period of two years with contract prices ranging between $65.50 and $68.50 per MWh. The swaps are expected to be settled by physical delivery on a monthly basis. The Company elected the normal purchase normal sale exclusion and will not apply fair value accounting under ASC 815, Derivatives and hedging. The Company will continue to assess its normal purchase and normal sale election on a quarterly basis.

The Company entered into a new commodity swap with NextEra in November 2022 for a period of two years at a contract price of $81.50 per MWh.

In November 2023, the Company entered into an electricity supply agreement with a utility provider for purchase of electricity to be used at one of our RNG facilities for a period of two years with a monthly notional quantity ranging between 1,875 and 2,145 Kilo watt hour and with fixed contract price $0.0599 per Kwh. The forward contract is expected to be settled by physical delivery of electricity on a monthly basis. The Company elected the normal purchase normal sale exclusion and will not apply fair value accounting under ASC 815, Derivatives and hedging. The Company will continue to assess its normal purchase and normal sale election on a quarterly basis.

The following table summarizes the commodity swaps in place as of December 31, 2023 and December 31, 2022.

Trade Date

Period From

Period To

Notional Quantity per Year (“MWh”)

Average Contract Price (per MWh)

October 17, 2022

January 1, 2023

December 31, 2024

70,176

68.50

October 17, 2022

January 1, 2023

December 31, 2024

26,280

65.50

November 17, 2022

January 1, 2023

December 31, 2024

35,088

81.50

The following table summarizes the effect of commodity swaps on the consolidated statements of operations for the years ended December 31, 2023 and 2022:


Derivatives not designated as hedging instruments	Location of (loss) gain recognized	Twelve Months Ended December 31,
		2023		2022
Commodity swaps - realized gain (loss)	Revenues - Renewable power	$	1,839	$	(1,757)
Commodity swaps - unrealized gain (loss)	Revenues - Renewable power	763		(512)
Total realized and unrealized gain (loss)	Revenues - Renewable power	$	2,602	$	(2,269)

The following table summarizes the derivative assets and liabilities related to commodity swaps as of December 31, 2023 and December 31, 2022


	Fair Value				Location of Fair value recognized in Balance Sheet
	December 31, 2023		December 31, 2022
Derivatives designated as economic hedges
Current portion of unrealized gain on commodity swaps	$	633	$	—	Derivative financial asset, current portion
Current portion of unrealized loss on commodity swaps	—		(130)		Derivative financial liability, current portion

Other derivative liabilities

On July 21, 2022, the Company recorded derivative liabilities for the outstanding public warrants and private warrants, put option to Meteora, the Sponsor Earnout Awards and the OPAL Earnout Awards. The private and public warrants were exchanged into Class A common stock in the four quarter of 2022. The put option with Meteora expired in January 2023. Please see Note 2. Summary of Significant Accounting Policies for additional information.The change in fair value on these derivative instruments is recorded as change in fair value of derivative instruments, net in the consolidated statement of operations for the years ended December 31, 2023 and 2022.

The following table summarizes the effect of change in fair value of other derivative liabilities on the consolidated statements of operations for the years ended December 31, 2023 and 2022:


Derivative liability	Twelve Months Ended December 31,				Location of (Loss) Gain Recognized in Operations from Derivatives
	2023		2022
Contingent liability payable to non-controlling interest	$	—	$	4,365
Put option to Meteora	(311)		134
Sponsor Earnout Awards	1,890		1,911
OPAL Earnout Awards	5,000		35,200
Public and Private Warrants	—		(9,027)
	$	6,579	$	32,583	Change in fair value of derivative instruments, net

Fair value measurements

The carrying value of the Company's long-term debt of $196,542 and $88,312 as of December 31, 2023 and December 31, 2022, respectively, represents the total amount to be repaid if the debt has to be discharged in full and therefore approximates its fair value.

Level 1 — defined as observable inputs such as quoted prices for identical instruments in active markets;

Level 3 — defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

The Company accounted for the Convertible Note Payable at fair value at each reporting period. As of December 31, 2023, the Convertible Note Payable was repaid in full. As of December 31, 2022, the Company recorded the Convertible Note Payable at par plus accrued interest as it is payable on demand by either party and therefore represents fair value.

The fair value of the Sponsor Earnout Awards as of December 31, 2023 resulted in a gain of $1,890 due to decrease in stock price which was determined using a Monte Carlo valuation model with a distribution of potential outcomes on a daily basis over the five year post-close period. Assumptions used in the valuation are as follows:

•Current stock price — The Company's closing stock price of $5.52 as of December 31, 2023;

•Expected volatility —55% based on historical and implied volatilities of selected industry peers deemed to be comparable to our business corresponding to the expected term of the awards;

•Risk-free interest rate — 4.0% based on the U.S. Treasury yield curve in effect at the time of issuance for zero-coupon U.S. Treasury notes with maturities corresponding to the expected 3.5 year term of the earnout period;

•Dividend yield - zero.

The fair value of the OPAL Earnout Awards as of December 31, 2023 was determined using a Monte Carlo valuation model with a distribution of potential outcomes for stock price and EBITDA over the 2-year period commencing on January 1, 2023 and ending on December 31, 2024.

The change in fair value of the OPAL Earnout Awards for the year ended December 31, 2023 resulted in a gain of $5,000 due to decrease in the EBITDA projections over the remaining 1-year period. Assumptions used in the valuation are as follows:

•Current stock price — The Company's closing stock price of $5.52 as of December 31, 2023;

•Weighted average cost of capital - 16% based on an average of historical volatilities of selected industry peers deemed to be comparable to our business.

•Expected volatility —40% based on historical and implied volatilities of selected industry peers deemed to be comparable to our business corresponding to the expected term of the awards;

•Risk-free interest rate — 4.8% based on the U.S. Treasury yield curve in effect at the time of issuance for zero-coupon U.S. Treasury notes with maturities corresponding to the expected 1.0 year term of the earnout period;

•Dividend yield - zero.


	Fair value as of December 31, 2023
	Level 1		Level 2		Level 3		Total
Liabilities:
Asset retirement obligation	$	—	$	—	$	6,728	$	6,728
Earnout liabilities	—		—		1,900		1,900
Assets:
Cash and cash equivalents and restricted cash - current and non-current (1)	47,242		—		—		47,242
Short term investments	9,875		—		—		9,875
Commodity swap contracts	—		633		—		633


	Fair value as of December 31, 2022
	Level 1		Level 2		Level 3		Total
Liabilities:
Asset retirement obligation	$	—	$	—	$	6,256	$	6,256
Convertible Note Payable	—		28,528		—		28,528
Put option with Meteora	—		—		4,466		4,466
Commodity swap contracts	—		130		—		130
Earnout liabilities	—		—		8,790		8,790
Assets:
Cash and cash equivalents and restricted cash - current and non-current (1)	77,221		—		—		77,221
Short term investments	64,976		—		—		64,976
Swaption	—		182		—		182
Interest rate swaps	—		954		—		954

(1) Includes balances in money market accounts of $31,965 and $6,769, respectively as of December 31, 2023 and 2022.

A summary of changes in the fair values of the Company’s Level 3 instruments, attributable to asset retirement obligations, for the year ended December 31, 2023 is included in Note 2. Summary of Significant Accounting Policies.

Leases

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Leases

The following are the type of contracts that fall under ASC 842:

Lessor contracts

Fuel Provider agreements

Power Purchase agreements

Included in Fuel Station Services revenues are $3,943 and $3,510 related to the lease portion of the FPAs for the years ended December 31, 2023 and 2022, respectively.

Included in Renewable Power revenues are $1,016 and $1,364 related to the lease element of the PPAs for the years ended December 31, 2023 and 2022, respectively.

Lessee contracts

Ground/Site leases

–As of the Adoption Date, the lease at Beacon facility is for 20 years at a monthly rent of $11.

–The lease term for MD and VS is for a period of 20 years from their commercial operation date at a quarterly rent of $125.

Office lease

The Company determined that the three site leases and the one office lease are operating leases.

an underlying asset for the lease term and the related lease liability represents an obligation to make lease payments pursuant to the contractual terms of the lease agreement.

Vehicle leases

Lease Disclosures Under ASC 842

Right-of-use assets and Lease liabilities as of December 31, 2023 and December 31, 2022 are as follows:


Description	Location in Balance Sheet	December 31, 2023		December 31, 2022
Assets:
Operating leases (1):
Site leases	Right-of-use assets	$	11,330	$	10,338
Office lease	Right-of-use assets	971		1,406
		12,301		11,744
Finance leases (1):
Vehicle leases	Property, plant and equipment, net	2,580		1,236
Site leases	Property, plant and equipment, net	6,468		—
		9,048		1,236

Total right-of-use assets		$	21,349	$	12,980
Liabilities (1):
Sites leases - operating	Operating lease liabilities - current portion	$	130	$	181
Office lease - operating	Operating lease liabilities - current portion	508		449
Vehicle leases - finance	Accrued expenses and other current liabilities	827		449
Site leases - finance	Accrued expenses and other current liabilities	571		—
		2,036		1,079

Sites leases - operating	Operating lease liabilities - non-current portion	11,222		10,135
Office lease - operating	Operating lease liabilities - non-current portion	602		1,110
Vehicle leases - finance	Other long-term liabilities	1,801		825
Site leases - finance	Other long-term liabilities	5,587		—
		19,212		12,070

Total lease liabilities		$	21,248	$	13,149

(1) The Operating and Finance lease right-of-use asset and corresponding lease liabilities represent the present value of lease payments for the remaining term of the lease. The discount rate used ranged from 3.59% to 8.44%.

The table below presents components of the Company's lease expense for the year ended December 31, 2023:

Description

Location in Statement of Operations

Amount (1)

Operating lease expense for site leases

Cost of sales - RNG Fuel

1,087

Operating lease expense for office lease

Selling, general, administrative expenses

484

Amortization of right-of-use assets - finance leases

Depreciation, amortization and accretion expense

667

Interest expense on lease liabilities - finance leases

Interest and financing expense, net

105

2,343

(1) The Company does not have material short term lease expense for the year ended December 31, 2023


Weighted average remaining lease term (years)	December 31, 2023
Operating leases	19.3 years
Financing leases	7.0 years
Weighted average discount rate
Operating leases	7.81	%
Financing leases	6.60	%

The table below provides the total amount of lease payments on an undiscounted basis on our lease contracts as of December 31, 2023:


	Site leases Operating			Office leases Operating			Vehicle leases Finance			Site leases Finance			Total

Weighted average discount rate	7.6		%	3.6		%	6.3		%	6.5		%

2024	$	1,058		$	540		$	1,044		$	963		$	3,605
2025	1,129			562			937			963			3,591
2026	1,129			47			782			963			2,921
2027	1,129			—			400			963			2,492
2028 and beyond	19,266			—			—			4,250			23,516
	23,711			1,149			3,163			8,102			36,125

Present value of lease liability	11,352			1,110			2,628			6,158			21,248

Lease liabilities - current portion	130			508			827			571			2,036
Lease liabilities - non-current portion	11,222			602			1,801			5,587			19,212
Total lease liabilities	$	11,352		$	1,110		$	2,628		$	6,158		$	21,248

Discount based on incremental borrowing rate	$	12,359		$	39		$	535		$	1,944		$	14,877

Leases

The following are the type of contracts that fall under ASC 842:

Lessor contracts

Fuel Provider agreements

Power Purchase agreements

Included in Fuel Station Services revenues are $3,943 and $3,510 related to the lease portion of the FPAs for the years ended December 31, 2023 and 2022, respectively.

Included in Renewable Power revenues are $1,016 and $1,364 related to the lease element of the PPAs for the years ended December 31, 2023 and 2022, respectively.

Lessee contracts

Ground/Site leases

–As of the Adoption Date, the lease at Beacon facility is for 20 years at a monthly rent of $11.

–The lease term for MD and VS is for a period of 20 years from their commercial operation date at a quarterly rent of $125.

Office lease

The Company determined that the three site leases and the one office lease are operating leases.

an underlying asset for the lease term and the related lease liability represents an obligation to make lease payments pursuant to the contractual terms of the lease agreement.

Vehicle leases

Lease Disclosures Under ASC 842

Right-of-use assets and Lease liabilities as of December 31, 2023 and December 31, 2022 are as follows:


Description	Location in Balance Sheet	December 31, 2023		December 31, 2022
Assets:
Operating leases (1):
Site leases	Right-of-use assets	$	11,330	$	10,338
Office lease	Right-of-use assets	971		1,406
		12,301		11,744
Finance leases (1):
Vehicle leases	Property, plant and equipment, net	2,580		1,236
Site leases	Property, plant and equipment, net	6,468		—
		9,048		1,236

Total right-of-use assets		$	21,349	$	12,980
Liabilities (1):
Sites leases - operating	Operating lease liabilities - current portion	$	130	$	181
Office lease - operating	Operating lease liabilities - current portion	508		449
Vehicle leases - finance	Accrued expenses and other current liabilities	827		449
Site leases - finance	Accrued expenses and other current liabilities	571		—
		2,036		1,079

Sites leases - operating	Operating lease liabilities - non-current portion	11,222		10,135
Office lease - operating	Operating lease liabilities - non-current portion	602		1,110
Vehicle leases - finance	Other long-term liabilities	1,801		825
Site leases - finance	Other long-term liabilities	5,587		—
		19,212		12,070

Total lease liabilities		$	21,248	$	13,149

The table below presents components of the Company's lease expense for the year ended December 31, 2023:

Description

Location in Statement of Operations

Amount (1)

Operating lease expense for site leases

Cost of sales - RNG Fuel

1,087

Operating lease expense for office lease

Selling, general, administrative expenses

484

Amortization of right-of-use assets - finance leases

Depreciation, amortization and accretion expense

667

Interest expense on lease liabilities - finance leases

Interest and financing expense, net

105

2,343

(1) The Company does not have material short term lease expense for the year ended December 31, 2023


Weighted average remaining lease term (years)	December 31, 2023
Operating leases	19.3 years
Financing leases	7.0 years
Weighted average discount rate
Operating leases	7.81	%
Financing leases	6.60	%

The table below provides the total amount of lease payments on an undiscounted basis on our lease contracts as of December 31, 2023:


	Site leases Operating			Office leases Operating			Vehicle leases Finance			Site leases Finance			Total

Weighted average discount rate	7.6		%	3.6		%	6.3		%	6.5		%

2024	$	1,058		$	540		$	1,044		$	963		$	3,605
2025	1,129			562			937			963			3,591
2026	1,129			47			782			963			2,921
2027	1,129			—			400			963			2,492
2028 and beyond	19,266			—			—			4,250			23,516
	23,711			1,149			3,163			8,102			36,125

Present value of lease liability	11,352			1,110			2,628			6,158			21,248

Lease liabilities - current portion	130			508			827			571			2,036
Lease liabilities - non-current portion	11,222			602			1,801			5,587			19,212
Total lease liabilities	$	11,352		$	1,110		$	2,628		$	6,158		$	21,248

Discount based on incremental borrowing rate	$	12,359		$	39		$	535		$	1,944		$	14,877

Leases

The following are the type of contracts that fall under ASC 842:

Lessor contracts

Fuel Provider agreements

Power Purchase agreements

Included in Fuel Station Services revenues are $3,943 and $3,510 related to the lease portion of the FPAs for the years ended December 31, 2023 and 2022, respectively.

Included in Renewable Power revenues are $1,016 and $1,364 related to the lease element of the PPAs for the years ended December 31, 2023 and 2022, respectively.

Lessee contracts

Ground/Site leases

–As of the Adoption Date, the lease at Beacon facility is for 20 years at a monthly rent of $11.

–The lease term for MD and VS is for a period of 20 years from their commercial operation date at a quarterly rent of $125.

Office lease

The Company determined that the three site leases and the one office lease are operating leases.

an underlying asset for the lease term and the related lease liability represents an obligation to make lease payments pursuant to the contractual terms of the lease agreement.

Vehicle leases

Lease Disclosures Under ASC 842

Right-of-use assets and Lease liabilities as of December 31, 2023 and December 31, 2022 are as follows:


Description	Location in Balance Sheet	December 31, 2023		December 31, 2022
Assets:
Operating leases (1):
Site leases	Right-of-use assets	$	11,330	$	10,338
Office lease	Right-of-use assets	971		1,406
		12,301		11,744
Finance leases (1):
Vehicle leases	Property, plant and equipment, net	2,580		1,236
Site leases	Property, plant and equipment, net	6,468		—
		9,048		1,236

Total right-of-use assets		$	21,349	$	12,980
Liabilities (1):
Sites leases - operating	Operating lease liabilities - current portion	$	130	$	181
Office lease - operating	Operating lease liabilities - current portion	508		449
Vehicle leases - finance	Accrued expenses and other current liabilities	827		449
Site leases - finance	Accrued expenses and other current liabilities	571		—
		2,036		1,079

Sites leases - operating	Operating lease liabilities - non-current portion	11,222		10,135
Office lease - operating	Operating lease liabilities - non-current portion	602		1,110
Vehicle leases - finance	Other long-term liabilities	1,801		825
Site leases - finance	Other long-term liabilities	5,587		—
		19,212		12,070

Total lease liabilities		$	21,248	$	13,149

The table below presents components of the Company's lease expense for the year ended December 31, 2023:

Description

Location in Statement of Operations

Amount (1)

Operating lease expense for site leases

Cost of sales - RNG Fuel

1,087

Operating lease expense for office lease

Selling, general, administrative expenses

484

Amortization of right-of-use assets - finance leases

Depreciation, amortization and accretion expense

667

Interest expense on lease liabilities - finance leases

Interest and financing expense, net

105

2,343

(1) The Company does not have material short term lease expense for the year ended December 31, 2023


Weighted average remaining lease term (years)	December 31, 2023
Operating leases	19.3 years
Financing leases	7.0 years
Weighted average discount rate
Operating leases	7.81	%
Financing leases	6.60	%

The table below provides the total amount of lease payments on an undiscounted basis on our lease contracts as of December 31, 2023:


	Site leases Operating			Office leases Operating			Vehicle leases Finance			Site leases Finance			Total

Weighted average discount rate	7.6		%	3.6		%	6.3		%	6.5		%

2024	$	1,058		$	540		$	1,044		$	963		$	3,605
2025	1,129			562			937			963			3,591
2026	1,129			47			782			963			2,921
2027	1,129			—			400			963			2,492
2028 and beyond	19,266			—			—			4,250			23,516
	23,711			1,149			3,163			8,102			36,125

Present value of lease liability	11,352			1,110			2,628			6,158			21,248

Lease liabilities - current portion	130			508			827			571			2,036
Lease liabilities - non-current portion	11,222			602			1,801			5,587			19,212
Total lease liabilities	$	11,352		$	1,110		$	2,628		$	6,158		$	21,248

Discount based on incremental borrowing rate	$	12,359		$	39		$	535		$	1,944		$	14,877

Related Party Disclosures - Fees Upon Entering Into Management Services Agreement with Related Party and Various Balances for Related Parties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Selling, general, and administrative	$ 51,262	$ 51,386
Related Party
Assets
Accounts receivable, related party	18,696	12,421
Accounts payable, related party	7,024	6,376
Related Party \| Payables to equity method investment entities
Assets
Accounts payable, related party	5,692	5,030
Related Party \| NextEra
Assets
Accounts payable, related party	501	501
Related Party \| Fortistar \| Staffing and management services
Assets
Accounts payable, related party	622	677
Related Party \| Costar
Related Party Transaction [Line Items]
Selling, general, and administrative	5,456	4,963
Related Party \| Costar \| Staffing and management services
Related Party Transaction [Line Items]
Selling, general, and administrative	1,834	2,154
Related Party \| Costar \| Rent - fixed compensation
Related Party Transaction [Line Items]
Selling, general, and administrative	668	604
Related Party \| Costar \| IT services
Related Party Transaction [Line Items]
Selling, general, and administrative	2,954	2,205
Assets
Accounts payable, related party	$ 209	$ 168

Borrowings - Senior Secured Credit Facility Narrative (Details) - USD ($) $ in Thousands			12 Months Ended
	Dec. 19, 2022	Sep. 21, 2015	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Repayment of Senior Secured Credit Facility			$ 22,750	$ 58,603
Cash dividends received			125	126
Related Party
Debt Instrument [Line Items]
Long-term asset			$ 489	$ 489
Senior Secured Credit Facility
Debt Instrument [Line Items]
Aggregate principal amount		$ 150,000
Repayment of Senior Secured Credit Facility		$ 14,300
Senior Secured Credit Facility \| Variable Rate, Fixed Margin, Period One \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on permanent loan		2.75%
Senior Secured Credit Facility \| Variable Rate, Fixed Margin, Period Two \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on permanent loan		3.00%
Senior Secured Credit Facility \| Variable Rate, Fixed Margin, Period Three \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on permanent loan		3.25%
Senior Secured Credit Facility \| Senior Secured Credit Facility - Debt Reserve And Liquidity Facility
Debt Instrument [Line Items]
Aggregate principal amount		$ 6,000
Senior Secured Credit Facility \| Secured Debt \| Senior Secured Credit Facility, term loan
Debt Instrument [Line Items]
Aggregate principal amount		125,000
Senior Secured Credit Facility \| Secured Debt \| Omnibus and Consent Agreement (the “FM3 Amendment”)
Debt Instrument [Line Items]
Repayment of Senior Secured Credit Facility	$ 54,929
Senior Secured Credit Facility \| Letter of Credit \| Senior Secured Credit Facility, working capital facility
Debt Instrument [Line Items]
Revolving credit arrangement borrowing capacity		$ 19,000

Borrowings - Schedule of Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 01, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Non-current borrowings	$ 196,542		$ 88,312
Sunoma Loan
Debt Instrument [Line Items]
Long-term debt, gross	22,453		23,000
Less: unamortized debt issuance costs	(835)		(908)
Less: current portion	(1,608)		(380)
Non-current borrowings	20,010		21,712
Convertible Note Payable
Debt Instrument [Line Items]
Long-term debt, gross	0		28,528
Less: current portion	0		(28,528)
Non-current borrowings	0		0
Municipality Loan
Debt Instrument [Line Items]
Long-term debt, gross	0		76
Less: current portion	0		(76)
Non-current borrowings	0		0
OPAL Term Loan \| OPAL Term Loan
Debt Instrument [Line Items]
Long-term debt, gross	186,618	$ 87,602	96,090
Less: unamortized debt issuance costs	(10,086)		(1,758)
Less: current portion	0		(27,732)
Non-current borrowings	176,532		66,600
OPAL Term Loan \| Senior Secured Credit Facility, term loan \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	0		15,250
Less: current portion	0		(15,250)
Non-current borrowings	0		0
Letter of Credit \| Senior Secured Credit Facility, working capital facility \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	0		7,500
Less: current portion	0		(7,500)
Non-current borrowings	$ 0		$ 0

Borrowings - Schedule of Interest Expense on Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Convertible Note Payable	$ 1,579	$ 413
Commitment fees and other finance fees	1,491	1,027
Interest expense on finance leases	105	45
Amortization of deferred financing cost	1,720	1,943
Interest income	(2,934)	(3,278)
Total interest and financing expense, net	9,306	6,640
Interest capitalized	$ 5,475	3,678
Third party fees	953
Senior Secured Credit Facility
Debt Instrument [Line Items]
Interest expense	$ 311	3,779
Municipality loan
Debt Instrument [Line Items]
Interest expense	0	7
Convertible Note Payable
Debt Instrument [Line Items]
Convertible Note Payable	1,579	413
Sunoma Loan
Debt Instrument [Line Items]
Interest expense	1,803	1,810
Secured Debt
Debt Instrument [Line Items]
Interest expense	$ 5,231	$ 894

Intangible Assets, Net - Schedule of Estimated Future Amortization Expense For Definite Lived Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
2024	$ 267
2025	267
2026	239
2027	238
Thereafter	593
Intangible Assets, Net	$ 1,604	$ 2,167

Reportable Segments and Geographic Information - Schedule of Net Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income (loss):	$ 127,024	$ 32,579
Equity Method Investment(s)	5,525	5,784
Renewable Power \| Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income (loss):	12,472	4,681
RNG Fuel \| Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income (loss):	16,678	26,330
Fuel Station Services \| Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income (loss):	17,908	18,245
Corporate \| Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income (loss):	$ 74,441	$ (22,461)

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-28

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480175/815-40-65-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-8

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-9

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 830
-Name Accounting Standards Codification
-Section 55
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+ Details

Cover Page - USD ($)	12 Months Ended
Cover Page - USD ($)	Dec. 31, 2023	Mar. 13, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-40272
Entity Registrant Name	OPAL FUELS INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	98-1578357
Entity Address, Address Line One	One North Lexington Avenue
Entity Address, Address Line Two	Suite 1450
Entity Address, City or Town	White Plains
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10601
City Area Code	914
Local Phone Number	705-4000
Title of 12(b) Security	Class A Common Stock, par value $0.0001 per share
Trading Symbol	OPAL
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 159,858,572
Entity Central Index Key	0001842279
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Class A common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		28,082,832
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		71,500,000
Class D common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		72,899,037

Leases (Tables)

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Right-Of-Use Assets And Lease Liabilities

Right-of-use assets and Lease liabilities as of December 31, 2023 and December 31, 2022 are as follows:


Description	Location in Balance Sheet	December 31, 2023		December 31, 2022
Assets:
Operating leases (1):
Site leases	Right-of-use assets	$	11,330	$	10,338
Office lease	Right-of-use assets	971		1,406
		12,301		11,744
Finance leases (1):
Vehicle leases	Property, plant and equipment, net	2,580		1,236
Site leases	Property, plant and equipment, net	6,468		—
		9,048		1,236

Total right-of-use assets		$	21,349	$	12,980
Liabilities (1):
Sites leases - operating	Operating lease liabilities - current portion	$	130	$	181
Office lease - operating	Operating lease liabilities - current portion	508		449
Vehicle leases - finance	Accrued expenses and other current liabilities	827		449
Site leases - finance	Accrued expenses and other current liabilities	571		—
		2,036		1,079

Sites leases - operating	Operating lease liabilities - non-current portion	11,222		10,135
Office lease - operating	Operating lease liabilities - non-current portion	602		1,110
Vehicle leases - finance	Other long-term liabilities	1,801		825
Site leases - finance	Other long-term liabilities	5,587		—
		19,212		12,070

Total lease liabilities		$	21,248	$	13,149

The table below presents components of the Company's lease expense for the year ended December 31, 2023:

Description

Location in Statement of Operations

Amount (1)

Operating lease expense for site leases

Cost of sales - RNG Fuel

1,087

Operating lease expense for office lease

Selling, general, administrative expenses

484

Amortization of right-of-use assets - finance leases

Depreciation, amortization and accretion expense

667

Interest expense on lease liabilities - finance leases

Interest and financing expense, net

105

2,343

(1) The Company does not have material short term lease expense for the year ended December 31, 2023


Weighted average remaining lease term (years)	December 31, 2023
Operating leases	19.3 years
Financing leases	7.0 years
Weighted average discount rate
Operating leases	7.81	%
Financing leases	6.60	%

Future Minimum Lease Payments - Finance Leases

The table below provides the total amount of lease payments on an undiscounted basis on our lease contracts as of December 31, 2023:


	Site leases Operating			Office leases Operating			Vehicle leases Finance			Site leases Finance			Total

Weighted average discount rate	7.6		%	3.6		%	6.3		%	6.5		%

2024	$	1,058		$	540		$	1,044		$	963		$	3,605
2025	1,129			562			937			963			3,591
2026	1,129			47			782			963			2,921
2027	1,129			—			400			963			2,492
2028 and beyond	19,266			—			—			4,250			23,516
	23,711			1,149			3,163			8,102			36,125

Present value of lease liability	11,352			1,110			2,628			6,158			21,248

Lease liabilities - current portion	130			508			827			571			2,036
Lease liabilities - non-current portion	11,222			602			1,801			5,587			19,212
Total lease liabilities	$	11,352		$	1,110		$	2,628		$	6,158		$	21,248

Discount based on incremental borrowing rate	$	12,359		$	39		$	535		$	1,944		$	14,877

Future Minimum Lease Payments - Operating Leases

The table below provides the total amount of lease payments on an undiscounted basis on our lease contracts as of December 31, 2023:


	Site leases Operating			Office leases Operating			Vehicle leases Finance			Site leases Finance			Total

Weighted average discount rate	7.6		%	3.6		%	6.3		%	6.5		%

2024	$	1,058		$	540		$	1,044		$	963		$	3,605
2025	1,129			562			937			963			3,591
2026	1,129			47			782			963			2,921
2027	1,129			—			400			963			2,492
2028 and beyond	19,266			—			—			4,250			23,516
	23,711			1,149			3,163			8,102			36,125

Present value of lease liability	11,352			1,110			2,628			6,158			21,248

Lease liabilities - current portion	130			508			827			571			2,036
Lease liabilities - non-current portion	11,222			602			1,801			5,587			19,212
Total lease liabilities	$	11,352		$	1,110		$	2,628		$	6,158		$	21,248

Discount based on incremental borrowing rate	$	12,359		$	39		$	535		$	1,944		$	14,877

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents (includes $166 and $12,506 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	$ 38,348	$ 40,394
Accounts receivable, net (includes $33 and $966 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	27,623	31,083
Restricted cash - current (includes $4,395 and $6,971 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	4,395	32,402
Short term investments	9,875	64,976
Fuel tax credits receivable	5,345	4,144
Contract assets	6,790	9,771
Parts inventory (includes $29 and $— at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	10,191	7,311
Environmental credits held for sale	172	1,674
Prepaid expense and other current assets (includes $107 and $415 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	6,005	7,625
Derivative financial assets, current portion	633	182
Total current assets	128,073	211,983
Capital spares	3,468	3,443
Property, plant, and equipment, net (includes $26,626 and $73,140 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	339,493	297,323
Operating leases, Right-of-use assets	12,301	11,744
Investment in other entities	207,099	51,765
Note receivable - variable fee component	2,302	1,942
Derivative financial assets, non-current portion	0	954
Deferred financing costs	0	3,013
Other long-term assets	1,162	1,489
Intangible assets, net	1,604	2,167
Restricted cash - non-current (includes $1,850 and $2,923 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	4,499	4,425
Goodwill	54,608	54,608
Total assets	754,609	644,856
Current liabilities:
Fuel tax credits payable	4,558	3,320
Accrued payroll	9,023	8,979
Accrued capital expenses (includes $— and $7,821 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	15,128	11,922
Accrued expenses and other current liabilities (includes $647 and $646 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	14,245	9,573
Contract liabilities	6,314	8,013
OPAL Term Loan, current portion	0	27,732
Sunoma loan, current portion (includes $1,608 and $380 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	1,608	380
Convertible Note Payable	0	28,528
Municipality Loan	0	76
Derivative financial liability, current portion	0	4,596
Operating lease liabilities - current portion	638	630
Other current liabilities (includes $92 and $— at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	92	1,085
Asset retirement obligation, current portion	3,860	1,296
Total current liabilities	76,391	152,905
Asset retirement obligation, non-current portion	2,868	4,960
OPAL Term Loan, net of debt issuance costs	176,532	66,600
Sunoma loan, net of debt issuance costs (includes $20,010 and $21,712 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	20,010	21,712
Lease liabilities - non-current portion, operating lease	11,824	11,245
Earn out liabilities	1,900	8,790
Other long-term liabilities (includes $211 and $— at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	7,599	825
Total liabilities	297,124	267,037
Commitments and contingencies
Stockholders' (deficit) equity
Additional paid-in capital	0	0
Accumulated deficit	(467,195)	(800,813)
Accumulated other comprehensive (loss) income	(15)	195
Class A common stock in treasury, at cost; 1,635,783 and — shares at December 31, 2023 and December 31, 2022, respectively	(11,614)	0
Total Stockholders' (deficit) equity attributable to the Company	(478,807)	(800,601)
Non-redeemable non-controlling interests	955	26,445
Total Stockholders' (deficit) equity	(477,852)	(774,156)
Total liabilities, Redeemable preferred, Redeemable non-controlling interests and Stockholders' (deficit) equity	754,609	644,856
Nonrelated Party
Current liabilities:
Accounts payable	13,901	17,649
Related Party
Current assets:
Accounts receivable, related party	18,696	12,421
Current liabilities:
Accounts payable	7,024	6,376
Senior Secured Credit Facility, term loan
Current liabilities:
Senior Secured Credit Facility - term loan, current portion, net of debt issuance costs	0	15,250
Senior Secured Credit Facility - working capital facility, current portion	0	15,250
Senior Secured Credit Facility, working capital facility
Current liabilities:
Senior Secured Credit Facility - term loan, current portion, net of debt issuance costs	0	7,500
Senior Secured Credit Facility - working capital facility, current portion	0	7,500
Redeemable preferred non-controlling interests
Current liabilities:
Redeemable non-controlling interests	132,617	138,142
Redeemable non-controlling interests
Current liabilities:
Redeemable non-controlling interests	802,720	1,013,833
Class A common stock
Stockholders' (deficit) equity
Common stock	3	3
Common Class B
Stockholders' (deficit) equity
Common stock	0	0
Common Class C
Stockholders' (deficit) equity
Common stock	0	0
Class D common stock
Stockholders' (deficit) equity
Common stock	$ 14	$ 14

Redeemable non-controlling interests, Redeemable preferred non-controlling interests and Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Changes in Redeemable Preferred Units

The following table summarizes the changes in the redeemable preferred non-controlling interests which represent Series A and Series A-1 preferred units outstanding at OPAL Fuels level from December 31, 2022 to December 31, 2023:


	Series A-1 preferred units			Series A preferred units			Total
	Units	Amount		Units	Amount
Balance, December 31, 2022	300,000	$	32,736	1,000,000	$	105,406	$	138,142
Paid-in-kind dividends attributable to OPAL Fuels	—	2,168		—	7,051		9,219
Paid-in kind dividends attributable to Class A common stockholders	—	422		—	1,370		1,792
Repayment of paid-in-kind preferred dividends	—	(4,722)		—	(11,814)		(16,536)
Balance, December 31, 2023	300,000	$	30,604	1,000,000	$	102,013	$	132,617

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Cash and cash equivalents	$ 38,348	$ 40,394
Accounts receivable, net	27,623	31,083
Restricted cash - current	4,395	32,402
Parts inventory	10,191	7,311
Prepaid expenses and other current assets	6,005	7,625
Property, plant and equipment, net	339,493	297,323
Restricted cash, non-current	4,499	4,425
Accrued capital expenses	15,128	11,922
Accrued expenses and other current liabilities	14,245	9,573
Sunoma Loan- current portion	1,608	380
Other current liabilities	92	1,085
Sunoma loan, net of debt issuance costs	20,010	21,712
Other long-term liabilities	7,599	825
Nonrelated Party
Accounts payable	13,901	17,649
Related Party
Accounts payable	7,024	6,376
Primary Beneficiary
Cash and cash equivalents	166	12,506
Accounts receivable, net	33	966
Restricted cash - current	4,395	6,971
Parts inventory	29	0
Prepaid expenses and other current assets	107	415
Property, plant and equipment, net	26,626	73,140
Restricted cash, non-current	1,850	2,923
Accounts payable	744	4,896
Accrued capital expenses	0	7,821
Accrued expenses and other current liabilities	647	646
Sunoma Loan- current portion	1,608	380
Other current liabilities	92	0
Sunoma loan, net of debt issuance costs	20,010	21,712
Other long-term liabilities	211	0
Primary Beneficiary \| Nonrelated Party
Accounts payable	744	4,896
Primary Beneficiary \| Related Party
Accounts payable	$ 1,046	$ 433
Class A common stock
Common stock, par value (in dollars per share)	$ 0.0001
Common stock, shares authorized (in shares)	340,000,000
Common stock, shares issued (in shares)	29,701,146	29,477,766
Common stock, shares outstanding (in shares)	29,701,146	29,477,766
Treasury stock (in shares)	1,635,783	0
Common Class B
Common stock, par value (in dollars per share)	$ 0.0001
Common stock, shares authorized (in shares)	160,000,000
Common stock, shares issued (in shares)	0	0
Common stock, shares outstanding (in shares)	0	0
Common Class C
Common stock, par value (in dollars per share)	$ 0.0001
Common stock, shares authorized (in shares)	160,000,000
Common stock, shares issued (in shares)	0	0
Common stock, shares outstanding (in shares)	0	0
Class D common stock
Common stock, par value (in dollars per share)	$ 0.0001
Common stock, shares authorized (in shares)	160,000,000
Common stock, shares issued (in shares)	144,399,037	144,399,037
Common stock, shares outstanding (in shares)	144,399,037	144,399,037

Net Income Per Share - Schedule of Basic and Diluted Net Loss Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net loss attributable to Class A common stockholders	$ 18,936	$ 3,391
Less:change in fair value of the put option on the forward purchase agreement	0	(134)
Diluted Net loss attributable to Class A common stockholders	$ 18,936	$ 3,257
Weighted average number of shares of Class A common stock - basic (in shares)	27,148,538	25,774,312
Effect of dilutive Restricted Stock Units (in shares)	345,478	14,203
Effect of dilutive put option on the forward purchase agreement (in shares)	0	273,883
Weighted average number of shares of Class A common stock - diluted (in shares)	27,494,016	26,062,398
Net loss per share of Class A common stock
Basic (in dollars per share)	$ 0.70	$ 0.13
Diluted (in dollars per share)	$ 0.69	$ 0.12

Borrowings - Opal Term Loan Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Sep. 01, 2023	Dec. 31, 2023	Dec. 31, 2022	Oct. 22, 2021	May 01, 2021
Debt Instrument [Line Items]
Repayment of Senior Secured Credit Facility		$ 22,750	$ 58,603
Dividends on Redeemable preferred non-controlling interests			744
Loss on extinguishment		2,190	0
Convertible Note Payable
Debt Instrument [Line Items]
Aggregate principal amount					$ 50,000
Debt outstanding		0	28,528
Indebtedness of payables	$ 30,107
OPAL Term Loan \| Secured Debt
Debt Instrument [Line Items]
Aggregate principal amount				$ 125,000
Debt outstanding	87,602	186,618	$ 96,090
Loss on extinguishment		295
Secured Debt \| Credit Agreement \| Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount	$ 450,000
Term of loan (in years)	18 months
Draws on standby letters of credit	$ 144,118	$ 42,500
Repayment of Senior Secured Credit Facility	$ 87,602
Amortization rate	1.00%
Minimum required debt service coverage ratio	120.00%
Minimum debt to cash flow ratio	4.5
Minimum debt to cash flow ratio after delayed draw availability period	4.0
Secured Debt \| Credit Agreement \| Line of Credit \| Redeemable Preferred non-controlling interests
Debt Instrument [Line Items]
Dividends on Redeemable preferred non-controlling interests	$ 15,669
Secured Debt \| Credit Agreement \| Line of Credit \| Minimum
Debt Instrument [Line Items]
Cash sweep	25.00%
Secured Debt \| Credit Agreement \| Line of Credit \| Maximum
Debt Instrument [Line Items]
Cash sweep	100.00%
Secured Debt \| Credit Agreement \| Line of Credit \| Variable Rate, Fixed Margin, Period One \| Term Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on permanent loan	3.50%
Secured Debt \| Credit Agreement \| Line of Credit \| Variable Rate, Fixed Margin, Period Two \| Term Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on permanent loan	0.25%
Revolving Credit Facility \| Credit Agreement \| Line of Credit
Debt Instrument [Line Items]
Revolving credit arrangement borrowing capacity	$ 50,000
Revolving Credit Facility \| Credit Agreement \| Letter of Credit
Debt Instrument [Line Items]
Revolving credit arrangement borrowing capacity	9,000
Financing fees paid	$ 9,976

Derivative Financial Instruments and Fair Value Measurements - Effect of Derivative Instruments on Statement of Operations (Details) - USD ($) $ in Thousands		12 Months Ended
	May 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Net periodic settlements - interest rate swaps		$ 1,146	$ (676)
Change in fair value of derivative instruments, net		1,100	498
Reclassification of adjustments into earnings		334
Change in fair value of derivative instruments, net		7,346	33,081
Derivatives designated as economic hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Commodity swaps - realized gain (loss)		1,839	(1,757)
Commodity swaps - unrealized gain (loss)		763	(512)
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swaps		0	992
Change in fair value of derivative instruments, net	$ 812
Swaption
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swaps		(46)	182
Commodity swap contracts \| Derivatives designated as economic hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of derivative instruments, net		$ 2,602	$ (2,269)

Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 38,348	$ 40,394
Restricted cash - current	4,395	32,402
Long-term assets:
Restricted cash held as collateral	4,499	4,425
Total cash, cash equivalents, and restricted cash	$ 47,242	$ 77,221	$ 42,054

Borrowings - Schedule of Principal Maturities of Debt (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
2024	$ 1,608
2025	24,137
2026	24,277
2027	24,430
2028	123,668
Thereafter	10,951
Total	209,071
OPAL Term Loan \| OPAL Term Loan
Debt Instrument [Line Items]
2024	0
2025	22,394
2026	22,394
2027	22,394
2028	119,436
Thereafter	0
Total	186,618
Sunoma Loan
Debt Instrument [Line Items]
2024	1,608
2025	1,743
2026	1,883
2027	2,036
2028	4,232
Thereafter	10,951
Total	$ 22,453

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Cash Flows [Abstract]
Interest capitalized	$ 5,475	$ 3,678

Variable Interest Entities - Schedule of Variable Interest Entities on Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 38,348	$ 40,394
Accounts receivable, net	27,623	31,083
Restricted cash - current	4,395	32,402
Environmental credits held for sale	172	1,674
Prepaid expenses and other current assets	6,005	7,625
Total current assets	128,073	211,983
Property, plant and equipment, net	339,493	297,323
Restricted cash, non-current	4,499	4,425
Total assets	754,609	644,856
Current liabilities:
Accrued capital expenses	15,128	11,922
Other current liabilities	92	1,085
Sunoma Loan- current portion	1,608	380
Total current liabilities	76,391	152,905
Sunoma loan, net of debt issuance costs	20,010	21,712
Other long-term liabilities	7,599	825
Total liabilities	297,124	267,037
Equity
Stockholders' equity	(478,807)	(800,601)
Non-redeemable non-controlling interests	955	26,445
Total Stockholders' (deficit) equity	(477,852)	(774,156)	$ 1,202
Total liabilities, Redeemable preferred, Redeemable non-controlling interests and Stockholders' (deficit) equity	754,609	644,856
Related Party
Current liabilities:
Accounts payable	7,024	6,376
Primary Beneficiary
Current assets:
Cash and cash equivalents	166	12,506
Accounts receivable, net	33	966
Restricted cash - current	4,395	6,971
Environmental credits held for sale	29	0
Prepaid expenses and other current assets	107	415
Total current assets	4,730	20,858
Property, plant and equipment, net	26,626	73,140
Restricted cash, non-current	1,850	2,923
Total assets	33,206	96,921
Current liabilities:
Accounts payable	744	4,896
Accrued expenses	647	646
Accrued capital expenses	0	7,821
Other current liabilities	92	0
Sunoma Loan- current portion	1,608	380
Total current liabilities	4,137	14,176
Sunoma loan, net of debt issuance costs	20,010	21,712
Other long-term liabilities	211	0
Total liabilities	24,358	35,888
Equity
Stockholders' equity	7,893	34,588
Non-redeemable non-controlling interests	955	26,445
Total Stockholders' (deficit) equity	8,848	61,033
Total liabilities, Redeemable preferred, Redeemable non-controlling interests and Stockholders' (deficit) equity	33,206	96,921
Primary Beneficiary \| Related Party
Current liabilities:
Accounts payable	$ 1,046	$ 433

Summary of Significant Accounting Policies - Project Development and Startup Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Site lease expenses	$ 1,021	$ 1,000
Legal and professional fees	1,141	124
Royalties	833	1,444
Virtual pipeline costs	1,295	3,200
Management services	237	109
Other	339	561
Total Project development and startup costs	4,866	$ 6,438
Expense incurred on equity method investment entities	$ 1,454

Intangible Assets, Net - Schedule of Intangible Assets with Definite Lives (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Cost	$ 10,642	$ 11,449
Accumulated Amortization	(9,038)	(9,282)
Intangible Assets, Net	1,604	2,167
Power purchase agreements
Finite-Lived Intangible Assets [Line Items]
Cost	8,999	8,999
Accumulated Amortization	(7,926)	(7,488)
Intangible Assets, Net	$ 1,073	$ 1,511
Weighted Average Amortization Period (Years)	18 years 1 month 6 days	18 years 1 month 6 days
Transmission/distribution interconnection
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,600	$ 1,600
Accumulated Amortization	(1,076)	(971)
Intangible Assets, Net	$ 524	$ 629
Weighted Average Amortization Period (Years)	15 years 1 month 6 days	15 years 1 month 6 days
CNG sales contract
Finite-Lived Intangible Assets [Line Items]
Cost		$ 807
Accumulated Amortization		(799)
Intangible Assets, Net		$ 8
Weighted Average Amortization Period (Years)		10 years
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Cost	$ 43	$ 43
Accumulated Amortization	(36)	(24)
Intangible Assets, Net	$ 7	$ 19
Weighted Average Amortization Period (Years)	5 years	5 years

Derivative Financial Instruments and Fair Value Measurements - Fair Value of Derivative Instruments on Balance Sheet and Effect of Netting Arrangements (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	$ 0	$ 1,136
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets/(Liabilities) in the Balance Sheet	0	1,136
Derivative financial assets, current portion	633	182
Derivative financial liability, current portion	0	(4,596)
Interest rate swaps
Derivative [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	0	954
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets/(Liabilities) in the Balance Sheet	0	954
Swaption
Derivative [Line Items]
Gross Amounts of Recognized Assets/(Liabilities)	0	182
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets/(Liabilities) in the Balance Sheet	0	182
Commodity swap contracts \| Derivatives designated as economic hedges:
Derivative [Line Items]
Derivative financial assets, current portion	633	0
Derivative financial liability, current portion	$ 0	$ (130)

Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation expense	$ 5,903	$ 1,469
2022 Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation expense	5,264	830
Parent Equity Awards
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation expense	$ 639	$ 639

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 1D
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480483/718-10-35-1D

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480483/718-10-35-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (c)(1)(iii)
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(01)
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(02)
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(03)
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(04)
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 2
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Paragraph 2
-Subparagraph (c)(2)(iii)(02)
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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Reference 20: http://www.xbrl.org/2003/role/disclosureRef
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Reference 21: http://www.xbrl.org/2003/role/disclosureRef
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Reference 22: http://www.xbrl.org/2003/role/disclosureRef
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Reference 24: http://www.xbrl.org/2003/role/disclosureRef
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Reference 25: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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Reference 26: http://www.xbrl.org/2003/role/disclosureRef
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Reference 27: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(v)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

+ Details

Property, Plant, and Equipment, Net

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Property, Plant, and Equipment, Net

Property, plant, and equipment, net, consisted of the following as of December 31, 2023 and December 31, 2022:


	December 31, 2023		December 31, 2022
Plant and equipment	$	205,188	$	201,655
CNG/RNG fueling stations	51,749		34,567
Construction in progress (1)	175,060		152,105
Buildings	2,585		2,585
Land	1,303		1,303
Service equipment	2,481		1,888
Leasehold improvements	815		815
Vehicles	489		313
Office furniture and equipment	307		307
Computer software	277		277
Land Lease - finance lease	6,469		—
Vehicles - finance leases	2,580		1,236
Other	591		487
	449,894		397,538
Less: accumulated depreciation	(110,401)		(100,215)
Property, plant, and equipment, net	$	339,493	$	297,323

(1) Includes $5,475 of interest capitalized from our general borrowings for the year ended December 31, 2023 and $3,678 for the year ended December 31, 2022.

As of December 31, 2023, construction in progress primarily consists of capital expenditure incurred for the construction of RNG generation facilities including, but not limited to Polk County, Prince William, Central Valley and RNG dispensing facilities. The majority of these facilities, for which costs are in construction in progress as of December 31, 2023, are expected to be operational in early 2024.

Depreciation expense on property, plant, and equipment for the years ended December 31, 2023 and December 31, 2022 was $13,481 and $11,892 respectively.

Summary of Significant Accounting Policies - Other Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Gain on deconsolidation of VIEs	$ 122,873	$ 0
Gain on redemption of Note receivable	0	1,943
Gain on transfer of non-financial asset in exchange for services received	1,599	0
Other income	$ 124,472	$ 1,943

Investments in Other Entities - Summary of Equity Method Investments (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Sep. 14, 2023

May 30, 2023

Aug. 31, 2021

Increase (Decrease) In Equity Method Investments [Roll Forward]

Beginning balance

$ 51,765

$ 47,150

Additional investment representing capitalized interest

597

Other comprehensive income

334

Net income from equity method investments

5,525

5,784

Net income from equity method investment

8,580

Distributions from return of investment in equity method investment

(4,839)

(2,100)

Distributions from return on investment in equity method investment

(12,242)

Deconsolidation of VIEs

^[1]

36,045

Reclassification of adjustments into earnings

(334)

Contribution by the Company

8,314

Accumulated other comprehensive loss

(8)

Gain on deconsolidation of Emerald and Sapphire

122,873

Amortization of basis difference

(3,055)

Ending balance

207,099

51,765

Deferred Financing Costs And Capitalized Interest

Increase (Decrease) In Equity Method Investments [Roll Forward]

Deconsolidation of VIEs

1,383

Emerald And Sapphire

Increase (Decrease) In Equity Method Investments [Roll Forward]

Deconsolidation of VIEs

$ 34,662

Pine Bend

Schedule of Equity Method Investments [Line Items]

Percentage of ownership

50.00%

Increase (Decrease) In Equity Method Investments [Roll Forward]

Beginning balance

$ 22,518

21,188

Additional investment representing capitalized interest

597

Other comprehensive income

Net income from equity method investments

733

Net income from equity method investment

4,333

Distributions from return of investment in equity method investment

(459)

Distributions from return on investment in equity method investment

(5,066)

Reclassification of adjustments into earnings

Contribution by the Company

Accumulated other comprehensive loss

Gain on deconsolidation of Emerald and Sapphire

Amortization of basis difference

(264)

Ending balance

21,062

22,518

Pine Bend | Deferred Financing Costs And Capitalized Interest

Increase (Decrease) In Equity Method Investments [Roll Forward]

Deconsolidation of VIEs

Pine Bend | Emerald And Sapphire

Increase (Decrease) In Equity Method Investments [Roll Forward]

Deconsolidation of VIEs

$ 0

Noble Road

Schedule of Equity Method Investments [Line Items]

Percentage of ownership

50.00%

Increase (Decrease) In Equity Method Investments [Roll Forward]

Beginning balance

$ 25,165

24,516

Additional investment representing capitalized interest

Other comprehensive income

Net income from equity method investments

2,749

Net income from equity method investment

5,642

Distributions from return of investment in equity method investment

(1,159)

(2,100)

Distributions from return on investment in equity method investment

(6,291)

Reclassification of adjustments into earnings

Contribution by the Company

Accumulated other comprehensive loss

Gain on deconsolidation of Emerald and Sapphire

Amortization of basis difference

(1,183)

Ending balance

22,174

25,165

Noble Road | Deferred Financing Costs And Capitalized Interest

Increase (Decrease) In Equity Method Investments [Roll Forward]

Deconsolidation of VIEs

Noble Road | Emerald And Sapphire

Increase (Decrease) In Equity Method Investments [Roll Forward]

Deconsolidation of VIEs

$ 0

GREP

Schedule of Equity Method Investments [Line Items]

Percentage of ownership

20.00%

Increase (Decrease) In Equity Method Investments [Roll Forward]

Beginning balance

$ 4,082

1,446

Additional investment representing capitalized interest

Other comprehensive income

334

Net income from equity method investments

(1,212)

2,302

Net income from equity method investment

(1,212)

Distributions from return of investment in equity method investment

Distributions from return on investment in equity method investment

(521)

Reclassification of adjustments into earnings

(334)

Contribution by the Company

Accumulated other comprehensive loss

Gain on deconsolidation of Emerald and Sapphire

Amortization of basis difference

Ending balance

2,015

4,082

GREP | Deferred Financing Costs And Capitalized Interest

Increase (Decrease) In Equity Method Investments [Roll Forward]

Deconsolidation of VIEs

GREP | Emerald And Sapphire

Increase (Decrease) In Equity Method Investments [Roll Forward]

Deconsolidation of VIEs

$ 0

SJI

Schedule of Equity Method Investments [Line Items]

Percentage of ownership

50.00%

Increase (Decrease) In Equity Method Investments [Roll Forward]

Beginning balance

$ 0

Additional investment representing capitalized interest

Other comprehensive income

Net income from equity method investments

Net income from equity method investment

(547)

Distributions from return of investment in equity method investment

Distributions from return on investment in equity method investment

Reclassification of adjustments into earnings

Contribution by the Company

2,114

Accumulated other comprehensive loss

Gain on deconsolidation of Emerald and Sapphire

Amortization of basis difference

Ending balance

1,567

SJI | Deferred Financing Costs And Capitalized Interest

Increase (Decrease) In Equity Method Investments [Roll Forward]

Deconsolidation of VIEs

SJI | Emerald And Sapphire

Increase (Decrease) In Equity Method Investments [Roll Forward]

Deconsolidation of VIEs

$ 0

Paragon

Schedule of Equity Method Investments [Line Items]

Percentage of ownership

50.00%

Increase (Decrease) In Equity Method Investments [Roll Forward]

Beginning balance

$ 0

Additional investment representing capitalized interest

Other comprehensive income

Net income from equity method investments

Net income from equity method investment

364

Distributions from return of investment in equity method investment

(3,221)

Distributions from return on investment in equity method investment

(364)

Reclassification of adjustments into earnings

Contribution by the Company

6,200

Accumulated other comprehensive loss

(8)

Gain on deconsolidation of Emerald and Sapphire

122,873

Amortization of basis difference

(1,608)

Ending balance

160,281

$ 0

Paragon | Deferred Financing Costs And Capitalized Interest

Increase (Decrease) In Equity Method Investments [Roll Forward]

Deconsolidation of VIEs

1,383

Paragon | Emerald And Sapphire

Increase (Decrease) In Equity Method Investments [Roll Forward]

Deconsolidation of VIEs

$ 34,662

[1]	As of May 30, 2023, two of our RNG facilities, Emerald and Sapphire were deconsolidated and accounted for under equity method as per ASC 323. Please see Note 3. Investment in Other Entities and Note 12. Variable Interest Entities for additional information.

Net Income Per Share

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Net Income Per Share

The basic income per share of Class A common stock is computed by dividing the net income attributable to Class A common stockholders by the weighted average number of Class A common stock outstanding during the period. The basic income per share for year ended December 31, 2023 does not include 1,635,783 shares in treasury, 763,908 shares issued and outstanding but are contingent on achieving earnout targets. In the first quarter of 2023, the put option was exercised and 197,258 shares of Class A common stock were cancelled.

The diluted income per share of Class A common stock for the year ended December 31, 2023 does not include Redeemable preferred non-controlling interests because the substantive contingency for conversion has not been met as of December 31, 2023. It does not include 144,399,037 OPAL Fuels Class B units representing Redeemable non-controlling interest as its impact is anti-dilutive. It does not include 716,650 Sponsor Earnout Awards and 10,000,000 OPAL Earnout Awards as their target share price and adjusted EBITDA contingencies have not been met as of December 31, 2023. The outstanding stock options issued under the 2022 Plan are not included as their impact is antidilutive. The outstanding performance units under the 2022 Plan are not included as the performance conditions have not been met as of December 31, 2023.

The Class D common stock does not participate in the earnings or losses of the Company and are therefore not participating securities. As such, separate presentation of basic and diluted earnings per share of Class D common stock under the two-class method has not been presented.

The following table summarizes the calculation of basic and diluted net loss per share:


	Twelve Months Ended December 31,
	2023		2022
Net loss attributable to Class A common stockholders	$	18,936	$	3,391
Less:change in fair value of the put option on the forward purchase agreement	—		(134)
Diluted Net loss attributable to Class A common stockholders	18,936		3,257

Weighted average number of shares of Class A common stock - basic	27,148,538		25,774,312
Effect of dilutive Restricted Stock Units	345,478		14,203
Effect of the dilutive put option on the forward purchase agreement	—		273,883
Weighted average number of shares of Class A common stock - diluted	27,494,016		26,062,398
Net loss per share of Class A common stock
Basic	$	0.70	$	0.13
Diluted	$	0.69	$	0.12

Derivative Financial Instruments and Fair Value Measurements - Narrative (Details)		1 Months Ended			12 Months Ended
	May 30, 2023 USD ($) interest_rate_swap	Nov. 30, 2023 kWh uSD_per_Kilowatt_Hour	Nov. 30, 2022 uSD_per_Megawatt-Hour	Oct. 31, 2022 commodity_swap uSD_per_Megawatt-Hour	Dec. 31, 2023 USD ($) $ / shares yr commodity_swap	Dec. 31, 2022 USD ($) commodity_swap	Aug. 31, 2022 USD ($) interest_rate_swap	Aug. 16, 2022 USD ($)	Nov. 30, 2019 uSD_per_Megawatt-Hour
Derivative [Line Items]
Change in fair value of derivative instruments, net					$ 7,346,000	$ 33,081,000
Proceeds from settlement from swaption counterparty					136,000
Loss on termination of swaption					46,000
Effective portion of the cash flow hedge attributable to equity method investments					(8,000)	334,000
Long-term debt, excluding current portion					196,542,000	88,312,000
Change in fair value of derivative instruments, net					$ 1,100,000	498,000
Forward Contracts
Derivative [Line Items]
Average Contract Price (per MWh) \| uSD_per_Kilowatt_Hour		0.0599
Derivative, term of contract (in years)		2 years
Sponsor Earnout Awards
Derivative [Line Items]
Warrants expiration period					5 years
OPAL Earnout Awards
Derivative [Line Items]
Change in fair value of derivative instruments, net					$ 5,000,000
Warrants expiration period					2 years
Warrant remaining term (in years)					1 year
Share price \| Sponsor Earnout Awards
Derivative [Line Items]
Warrants, measurement input \| $ / shares					5.52
Share price \| OPAL Earnout Awards
Derivative [Line Items]
Warrants, measurement input \| $ / shares					5.52
Expected volatility \| Sponsor Earnout Awards
Derivative [Line Items]
Warrants, measurement input					0.55
Expected volatility \| OPAL Earnout Awards
Derivative [Line Items]
Warrants, measurement input					0.40
Risk free interest rate \| Sponsor Earnout Awards
Derivative [Line Items]
Warrants, measurement input					0.040
Risk free interest rate \| OPAL Earnout Awards
Derivative [Line Items]
Warrants, measurement input					0.048
Expected term \| Sponsor Earnout Awards
Derivative [Line Items]
Warrants, measurement input \| yr					3.5
Expected term \| OPAL Earnout Awards
Derivative [Line Items]
Warrants, measurement input \| yr					1
Dividend yield \| Sponsor Earnout Awards
Derivative [Line Items]
Warrants, measurement input					0
Dividend yield \| OPAL Earnout Awards
Derivative [Line Items]
Warrants, measurement input					0
Weighted average cost of capital \| OPAL Earnout Awards
Derivative [Line Items]
Warrants, measurement input					0.16
Minimum \| Forward Contracts
Derivative [Line Items]
Notional quantity (Kilowatt hour) \| kWh		1,875
Minimum \| Discount rate \| Level 3
Derivative [Line Items]
Asset retirement obligation, measurement input					0.0575
Maximum \| Forward Contracts
Derivative [Line Items]
Notional quantity (Kilowatt hour) \| kWh		2,145
Maximum \| Discount rate \| Level 3
Derivative [Line Items]
Asset retirement obligation, measurement input					0.085
Interest rate swaps
Derivative [Line Items]
Number of derivative instruments held \| interest_rate_swap	2						2
Notional amount					$ 0	61,926,000	$ 61,926,000
Fixed rate							2.47%
Change in fair value of derivative instruments, net	$ 812,000
Collateral balances with counterparties outstanding					0	$ 0
Interest rate swaps \| Paragon
Derivative [Line Items]
Number of derivative instruments held \| interest_rate_swap	4
Notional amount	$ 56,914,000
Fixed rate	3.52%
Change in fair value of derivative instruments, net					$ 812,000
Interest rate swaps \| Cash Flow Hedging
Derivative [Line Items]
Number of derivative instruments held \| interest_rate_swap							2
Interest rate swaption
Derivative [Line Items]
Notional amount								$ 13,074,000
Fixed rate								2.32%
Commodity swap contracts
Derivative [Line Items]
Number of derivative instruments held \| commodity_swap					3	3
Commodity swap contracts \| NextEra
Derivative [Line Items]
Average Contract Price (per MWh) \| uSD_per_Megawatt-Hour			81.50
Number of additional commodity swaps \| commodity_swap				2
Derivative, term of contract (in years)			2 years	2 years
Commodity swap contracts \| Minimum \| NextEra
Derivative [Line Items]
Average Contract Price (per MWh) \| uSD_per_Megawatt-Hour				65.50					35.75
Commodity swap contracts \| Maximum \| NextEra
Derivative [Line Items]
Average Contract Price (per MWh) \| uSD_per_Megawatt-Hour				68.50					51.25
Sponsor Earnout Awards
Derivative [Line Items]
Change in fair value of derivative instruments, net					$ 1,890,000	$ 1,911,000

Goodwill (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Goodwill

The following table summarizes the changes in goodwill, if any, by reporting segment from the beginning of the period to the end of the period:


	RNG Fuel		Fuel Station Services		Total
Balance at December 31, 2023	$	51,155	$	3,453	$	54,608
Balance at December 31, 2022	$	51,155	$	3,453	$	54,608

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1A

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-2

+ Details

Leases - Right-of-Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 27, 2023
Lessee, Lease, Description [Line Items]
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, plant, and equipment, net (includes $26,626 and $73,140 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	Property, plant, and equipment, net (includes $26,626 and $73,140 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other current liabilities (includes $647 and $646 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	Accrued expenses and other current liabilities (includes $647 and $646 at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other long-term liabilities (includes $211 and $— at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)	Other long-term liabilities (includes $211 and $— at December 31, 2023 and December 31, 2022, respectively, related to consolidated VIEs)
Operating leases, Right-of-use assets	$ 12,301	$ 11,744
Finance lease	9,048	1,236
Operating right-of use assets	21,349	12,980
Operating lease liabilities - current portion	638	630
Lease liabilities - current portion	2,036	1,079
Lease liabilities - non-current portion, operating lease	11,824	11,245
Lease liabilities - non-current portion	19,212	12,070
Total lease liabilities	21,248	13,149
Amortization of right-of-use assets - finance leases	667
Interest expense on lease liabilities - finance leases	105	45
Total lease expense	$ 2,343
Weighted average remaining lease term (years)
Operating leases	19 years 3 months 18 days
Financing leases	7 years
Weighted average discount rate
Operating leases	7.81%
Financing leases	6.60%
Minimum
Lessee, Lease, Description [Line Items]
Discount rate	3.59%
Maximum
Lessee, Lease, Description [Line Items]
Discount rate	8.44%
Site leases
Lessee, Lease, Description [Line Items]
Operating leases, Right-of-use assets	$ 11,330	10,338
Finance lease	6,468	0	$ 6,469
Operating lease liabilities - current portion	130	181
Lease liabilities - current portion, finance lease	571	0
Lease liabilities - non-current portion, operating lease	11,222	10,135
Lease liabilities - non-current portion, finance lease	5,587	0
Lease expense	$ 1,087
Weighted average discount rate
Operating leases	7.60%
Financing leases	6.50%
Office lease
Lessee, Lease, Description [Line Items]
Operating leases, Right-of-use assets	$ 971	1,406
Operating lease liabilities - current portion	508	449
Lease liabilities - non-current portion, operating lease	602	1,110
Lease expense	$ 484
Weighted average discount rate
Operating leases	3.60%
Vehicles
Lessee, Lease, Description [Line Items]
Finance lease	$ 2,580	1,236
Lease liabilities - current portion, finance lease	827	449
Lease liabilities - non-current portion, finance lease	$ 1,801	$ 825
Weighted average discount rate
Financing leases	6.30%

Organization and Description of Business	12 Months Ended
Organization and Description of Business	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business OPAL Fuels Inc. (including its subsidiaries, the "Company", “OPAL,” “we,” “us” or “our”) is a renewable energy company specializing in the capture and conversion of biogas for the (i) production of RNG for use as a vehicle fuel for heavy and medium-duty trucking fleets, (ii) generation of Renewable Power for sale to utilities, (iii) generation and sale of Environmental Attributes associated with RNG and Renewable Power, and (iv) sales of RNG as pipeline quality natural gas. OPAL also designs, develops, constructs, operates and services Fueling Stations for trucking fleets across the country that use natural gas to displace diesel as their transportation fuel. The biogas conversion projects ("Biogas Conversion Projects") currently use landfill gas and dairy manure as the source of the biogas. In addition, we have recently begun implementing design, development, and construction services for hydrogen Fueling Stations, and we are pursuing opportunities to diversify our sources of biogas to other waste streams. The Company is organized into four operating segments based on the characteristics and the nature of products and services. The four operating segments are - RNG Fuel, Fuel Station Services, Renewable Power and Corporate. During the first and third quarters of 2023, the Company changed its internal reporting to its executive leadership team ("Chief Operating Decision Makers") to change the composition of revenues included in our reportable segments. Please see Note 11. Reportable Segments and Geographic Information for additional information. All amounts in these footnotes are presented in thousands of dollars except per share data.

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

Variable Interest Entities

On May 30, 2023, the Company together with a third-party environmental solutions company formed Paragon RNG LLC ("Paragon"), a new joint venture holding company. The Company owns 50% of the ownership interest in Paragon. Concurrent to the formation of Paragon, the Company contributed its 50% ownership interests in Emerald and Sapphire to Paragon. Upon the execution of the above transaction, the Company reassessed its equity interests in Emerald RNG LLC ("Emerald") and Sapphire RNG LLC ("Sapphire") under ASC 810, Consolidation and determined that the Company did not have a controlling financial interest in Paragon under ASC 810 because the governance of Paragon is driven by a board jointly controlled equally by the joint venture partner and the Company and there are substantive participating rights held by the joint venture partner in the significant activities of Paragon. As a result of the reassessment, the Company deconsolidated these two entities effective May 30, 2023. Prior to May 30, 2023, the Company consolidated these two entities in accordance with the variable interest entity model guidance under ASC 810, Consolidation.

On September 14, 2023, OPAL Land2Gas LLC (“OPAL L2G”), a wholly-owned indirect subsidiary of OPAL Fuels Inc. (the “Company”), entered into a Limited Liability Company Agreement (for purposes of this paragraph, the “Agreement”) with SJI Landfill RNG LLC (“SJI LRNG”), a wholly-owned indirect subsidiary of South Jersey Industries (“SJI”), establishing the terms and conditions of governance and operation of Land2Gas LLC (the “ SJI Joint Venture”). The purpose of the Joint Venture, which is owned 50/50 by OPAL L2G and SJI LRNG, is to develop, construct, own and operate facilities (“Facilities”) to produce RNG using biogas generated by certain landfills. The Agreement governs the terms and conditions of capital contributions to be made by the SJI Joint Venture members to fund the development, construction and operations of the Facilities. The Agreement requires members of the SJI Joint Venture to contribute their respective share (50% each) of such capital requirements. The Agreement initially contemplates two RNG projects (RNG Atlantic and RNG Burlington) in New Jersey with each RNG project represented as a separate series of membership interests, also owned 50-50 by the members. Further, the Agreement provides for the SJI Joint Venture to enter into a Management Services Agreement (“MSA”), Operations and Maintenance Agreement (“O&M Agreement”), and dispensing agreement with certain wholly-owned, indirect subsidiaries of the Company. The MSA establishes the terms and conditions for the day-to-day administration of the projects, including responsibility for managing the development and overseeing the construction of the Facilities. The O&M Agreement establishes the terms and conditions for operating and maintaining the Facilities once construction is completed. The Dispensing Agreement provides for the acquisition, marketing and sale of the Environmental Attributes associated with RNG produced by the Facilities.

Upon the execution of the above transaction, the Company assessed its equity interests in the SJI Joint Venture under ASC 810, Consolidation and determined that the Company does not have a controlling financial interest in SJI Joint Venture under ASC 810 because the governance of the joint venture is driven by a board jointly controlled by the joint venture partner and OPAL equally and there are substantive participating rights held by the joint venture partner in the significant activities of SJI Joint Venture. As of December 31, 2023, the Company contributed $2,115 towards RNG Atlantic.

As of December 31, 2023, the Company accounted for its ownership interests in Pine Bend RNG LLC ("Pine Bend"), Noble Road RNG LLC ("Noble Road"), Emerald, Sapphire, Paragon, SJI Joint Venture (RNG Atlantic and RNG Burlington) and GREP BTB Holdings LLC ("GREP") under the equity method.

As of December 31, 2022, the Company accounted for its ownership interests in Pine Bend, Noble Road and GREP under the equity method. Please see Note 3. Investment in Other Entities, for additional information.

Use of estimates

Accounting Pronouncements Adopted

Accounting Pronouncements Not Yet Adopted

Emerging Growth Company Status

We are an emerging growth company as defined in the JOBS Act. The JOBS Act provides emerging growth companies with certain exemptions from public company reporting requirements for up to five fiscal years while a company remains an emerging growth company. As part of these exemptions, we need only provide two fiscal years of audited financial statements instead of three, we have reduced disclosure obligations such as for executive compensation, and we are not required to comply with auditor attestation requirements from Section 404(b) of the Sarbanes-Oxley Act regarding our internal control over financial reporting. Additionally, the JOBS Act has allowed us the option to delay adoption of new or revised financial accounting standards until private companies are required to comply with new or revised financial accounting standards.

Cash, Cash Equivalents, and Restricted Cash

Cash, cash equivalents, and restricted cash consisted of the following as of December 31, 2023 and December 31, 2022:


	December 31, 2023		December 31, 2022
Current assets:
Cash and cash equivalents	$	38,348	$	40,394
Restricted cash - current (1)	4,395		32,402
Long-term assets:
Restricted cash held as collateral (2)	4,499		4,425
Total cash, cash equivalents, and restricted cash	$	47,242	$	77,221

(2) Restricted cash held as collateral represents the collateral requirements on our debt facilities.

Short term investments

Earnout Awards

Put option on forward purchase agreement

Prior to the closing of the Business Combination, the Company entered into a Forward Purchase Agreement with Meteora pursuant to which Meteora agreed to purchase 2,000,000 shares of Class A common stock from shareholders who had previously tendered such shares for redemption but agreed to reverse their redemption and sell such shares to Meteora at the redemption price. The Company placed $20,040 in escrow at the closing of the Business Combination to secure its purchase obligation to repurchase these 2,000,000 shares at Meteora’s option for a price of $10.02 per share on the date that is six months after closing of the Business Combination. The put option written to Meteora on 2,000,000 shares of Class A common stock is recorded as a liability under Topic 480 Distinguishing Liabilities from Equity with the change in the fair market value recognized in the statement of operations as part of change in fair value of derivative instruments, net.

On January 23, 2023, pursuant to the terms of the Forward Purchase Agreement, Meteora exercised its option to sell back 1,635,783 shares to the Company. $16,391 of the funds held in escrow which were previously recorded as part of Restricted Cash - current on the Company's consolidated balance sheet as of December 31, 2022 were released to Meteora (excluding accrued interest). In connection with the above, the Sponsor forfeited 197,258 shares of Class A common stock on January 26, 2023 pursuant to the terms of that certain Letter Agreement dated July 21, 2022. The Company treated the repurchased shares as treasury shares and recorded $11,614 representing the fair value of those shares at the closing share price of $7.01 as an adjustment to Stockholders' deficit. Additionally, the Company recorded $4,777 as an offset to the Derivative financial liability - current in its consolidated balance sheet as of December 31, 2023.

Redeemable non-controlling interests

At each balance sheet date, the mezzanine equity classified Redeemable non-controlling interests is adjusted up to their maximum redemption value if necessary, with an offset in Stockholders' equity. As of December 31, 2023, the maximum redemption value was $802,720.

Stock-based compensation

Project development and start up costs

The following table provides information on the types of expenses classified under this expense category:


	Twelve Months Ended December 31,
	2023		2022
Site lease expenses	$	1,021	$	1,000
Legal and professional fees	1,141		124
Royalties	833		1,444
Virtual pipeline costs (1)	1,295		3,200
Management services (2)	237		109
Other	339		561
Total Project development and startup costs (3)	$	4,866	6,438

(1) Virtual pipeline costs for the year ended December 31, 2023 relate to New River and Prince William. For the year ended December 31, 2022, they relate to New River which came online in May 2022.

(2) Relates to charges billed to the individual projects by Fortistar. See Note. 10 Related parties for additional information.

(3) Excludes 1,454 of expenses for the year ended December 31, 2023 incurred on our equity method investment entities which are not consolidated.

Net income per share

The Company's basic earnings per share of Class A common stock is computed based on the average number of outstanding shares of Class A common stock for the period.

Accounts Receivable, Net

The Company's allowance for credit losses was $0 and $0 at December 31, 2023 and December 31, 2022.

Fuel Tax Credit Receivable/Payable

At December 31, 2023, the Company accrued federal fuel tax credits of $0.50 per gasoline gallon equivalent of CNG that the Company sold as vehicle fuel in 2023. At December 31, 2023 and 2022, fuel tax credits receivable were $5,345 and $4,144, respectively. Under the terms of its fuel sales agreements with certain of its customers, the Company is obligated to share portions of these tax credits. At December 31, 2023 and 2022, the amounts of fuel tax credits owed to customers were $4,558 and $3,320, respectively. The Company recorded its portion of tax credits earned as a reduction to cost of sales — RNG fuel in the consolidated statements of operations.

Asset Retirement Obligation

As of December 31, 2023 and 2022, the Company estimated the value of its total asset retirement obligations to be $6,728 and $6,256, respectively.

The changes in the asset retirement obligations were as follows as of December 31, 2023:


	December 31, 2023
Balance, December 31, 2022	$	6,256
Payment of Asset retirement obligations during the year	(49)
Accretion expense	521
Total asset retirement obligation	6,728
Less: current portion	(3,860)
Total asset retirement obligation, net of current portion	$	2,868

Revenue Recognition

recognized over time as services are provided. Capacity payments fluctuate based on peak times of the year and revenues from capacity payments are recognized monthly as earned.

Disaggregation of Revenue

The following table shows the disaggregation of revenue according to product line:


	Twelve Months Ended December 31,
	2023		2022
Renewable power sales	$	33,648	$	33,881
Third party construction	49,318		49,458
Service	16,711		16,449
Brown gas sales	19,587		38,356
Environmental credits (1)	126,573		86,901
Parts sales	4,680		4,391
Operating agreements	—		893
Other	632		328
Total revenue from contracts with customers	251,149		230,657
Lease revenue (2)	4,959		4,874
Total revenue	$	256,108	$	235,531

(1) Includes revenues of $16,325 and $3,114 for the years ended December 31, 2023 and 2022, from customers domiciled outside of United States.

For the years ended December 31, 2023 and 2022, 19% and 21%, respectively of revenue was recognized over time, and the remainder was for products and services transferred at a point in time.

Other income

The following table shows the items consisting of items recorded as Other income:


	Twelve Months Ended December 31,
	2023		2022
Gain on deconsolidation of VIEs (1)	$	122,873	$	—
Gain on redemption of Note receivable	—		1,943
Gain on transfer of non-financial asset in exchange for services received (2)	1,599		—
Other income	$	124,472	$	1,943

(1) Represents non-cash gain on deconsolidation of Emerald and Sapphire on May 30, 2023.

(2) Represents the fair value of RINs transferred as consideration for services received.

Contract Assets

Contract Liabilities

Contract Balances

The following table provides information about receivables, contract assets, and contract liabilities from contracts with customers:


	December 31, 2023		December 31, 2022
Accounts receivable, net	$	27,623	$	31,083
Contract assets:
Cost and estimated earnings in excess of billings	$	4,630	$	7,027
Accounts receivable retainage, net	2,160		2,744
Contract assets total	$	6,790	$	9,771
Contract liabilities:
Billings in excess of costs and estimated earnings	$	6,314	$	8,013
Contract liabilities total	$	6,314	$	8,013

During the twelve months ended December 31, 2023, the Company recognized revenue of $8,013 that was included in "Contract liabilities" at December 31, 2022. During the twelve months ended December 31, 2022, the Company recognized revenue of $9,785 that was included in "Contract liabilities" at December 31, 2021.

Parts Inventory

Capital Spares

expensed when placed into service as part of a routine maintenance project or capitalized when part of a plant improvement project.

Property, Plant, and Equipment, net


Plant and equipment						5 - 30 years
CNG/RNG fueling stations						10-20 years
Construction in progress						N/A
Buildings						40 years
Land						N/A
Service equipment						5-10 years
Leasehold improvements						shorter of lease term or useful life
Vehicles						7 years
Office furniture and equipment						5-7 years
Computer software						3 years
Land lease - finance lease						Lease term
Vehicles - finance lease						shorter of lease term or useful life
Other						7 years

Deferred financing costs

Environmental credits held for sale

The Company provides credit monetization services to customers that own renewable gas generation facilities. The Company recognizes revenue from these services as the credits are minted on behalf of the customer. The Company receives non-cash consideration in the form of RINs or LCFSs for providing these services and recognizes the environmental credits received as part of Revenues - Fuel Station Services and Environmental credits held for sale within current assets based on their estimated fair value at contract inception. It is recorded at historical fair value at contract inception and adjusted to its net realizable value at each balance sheet date. Due to the historically higher LCFS pricing, the

fair value at contract inception may be significantly higher than the net realizable value of the environmental credits generated. For the years ended December 31, 2023 and 2022, the Company recorded $7,354 and $3,523 and as part of Cost of sales - Fuel Station Services.

Fuel Station Services Construction Backlog

The Company's remaining performance obligations ("backlog") represent the unrecognized revenue value of its contract commitments. The Company's backlog may significantly vary each reporting period based on the timing of major new contract commitments. At December 31, 2023, the Company had a backlog of $37,531 of which $29,450 is anticipated to be recognized as revenue in the next 12-months.

Major Maintenance

Major maintenance is a component of maintenance expense and encompasses overhauls of internal combustion engines, gas compressors and electrical generators. Major maintenance is expensed as incurred. Major maintenance expense was $7,240 and $4,701 for the years ended December 31, 2023 and 2022 respectively, and is included in cost of sales — renewable power in the consolidated statements of operations.

Goodwill

Intangible Assets and Liabilities

Impairment of Long-Lived Assets

Derivative Instruments

Vulnerability Due to Certain Concentrations

Income Taxes

Significant Customers, Vendors and Concentration of Credit Risk

For the year ended December 31, 2023 two customer accounted for 47% of revenue. For the year ended December 31, 2022, two customers accounted for 49% of revenue. At December 31, 2023, two customers accounted for 54% of accounts receivable. At December 31, 2022, two customers accounted for 45%, of accounts receivable.

As of December 31, 2023 one vendor accounted for 32% of the accounts payable. As of December 31, 2022, one vendor accounted for 19% of the accounts payable.

Investment in other entities

Redeemable non-controlling interests, Redeemable preferred non-controlling interests and Stockholders' Equity - Changes in Redeemable Preferred Units (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) shares
Redeemable Preferred non-controlling interests
Increase (Decrease) In Temporary Equity, Amount [Roll Forward]
Beginning balance	$ 138,142
Paid-in-kind dividends attributable to OPAL Fuels	9,219
Paid-in kind dividends attributable to Class A common stockholders	1,792
Repayment of paid-in-kind preferred dividends	(16,536)
Ending balance	$ 132,617
Series A-1 preferred units
Increase (Decrease) In Temporary Equity, Units [Roll Forward]
Beginning balance (in shares) \| shares	300,000
Ending balance (in shares) \| shares	300,000
Increase (Decrease) In Temporary Equity, Amount [Roll Forward]
Beginning balance	$ 32,736
Paid-in-kind dividends attributable to OPAL Fuels	2,168
Paid-in kind dividends attributable to Class A common stockholders	422
Repayment of paid-in-kind preferred dividends	(4,722)
Ending balance	$ 30,604
Series A preferred units
Increase (Decrease) In Temporary Equity, Units [Roll Forward]
Beginning balance (in shares) \| shares	1,000,000
Ending balance (in shares) \| shares	1,000,000
Increase (Decrease) In Temporary Equity, Amount [Roll Forward]
Beginning balance	$ 105,406
Paid-in-kind dividends attributable to OPAL Fuels	7,051
Paid-in kind dividends attributable to Class A common stockholders	1,370
Repayment of paid-in-kind preferred dividends	(11,814)
Ending balance	$ 102,013

Net Income Per Share - Narrative (Details) - shares	3 Months Ended	12 Months Ended
Net Income Per Share - Narrative (Details) - shares	Mar. 31, 2023	Dec. 31, 2023
Class A common stock in treasury
Class of Warrant or Right [Line Items]
Antidilutive shares (in shares)		1,635,783
Class A common stock
Class of Warrant or Right [Line Items]
Forfeited shares (in shares)	197,258
Common Class B
Class of Warrant or Right [Line Items]
Antidilutive shares (in shares)		144,399,037
Earnout Target
Class of Warrant or Right [Line Items]
Antidilutive shares (in shares)		763,908
Sponsor Earnout Awards
Class of Warrant or Right [Line Items]
Antidilutive shares (in shares)		716,650
OPAL Earnout Awards
Class of Warrant or Right [Line Items]
Antidilutive shares (in shares)		10,000,000

Related Parties

12 Months Ended

Dec. 31, 2023

Related Parties

Related parties are represented by Fortistar and other affiliates, subsidiaries and entities under common control with Fortistar or NextEra.

Sale of non-controlling interests to Related Parties

On November 29, 2021, as part of an exchange agreement, OPAL Fuels issued 14 newly authorized common units and 300,000 Series A-1 preferred units to Hillman in return for Hillman’s non-controlling interest in four RNG project subsidiaries for total consideration of $30,000. Upon the consummation of the Business Combination, the Series A-1 preferred units have been converted to Redeemable preferred non-controlling interests. The Company recorded preferred dividend of $2,590 and $2,526 for the years ended December 31, 2023 and 2022, respectively. Please see Note 13. Redeemable non-controlling interests, Redeemable preferred non-controlling interests and Stockholders' Equity, for additional information. As of December 31, 2023 and 2022, there was accrued preferred dividend payable of $604 and $2,526, respectively.

Issuance of Redeemable preferred non-controlling interests

On November 29, 2021, NextEra subscribed for up to 1,000,000 Series A preferred units, which are issuable (in whole or in increments) at the Company’s discretion prior to June 30, 2022. During the year ended December 31, 2022, the

Company had drawn $100,000 and issued 1,000,000 Series A preferred units. The Company recorded paid-in-kind preferred dividend of $8,421 and $5,406 for the years ended December 31, 2023 and 2022 respectively. As of December 31, 2023 and 2022, there was accrued preferred dividend payable of $2,013 and $5,406, respectively. Please see Note 13. Redeemable non-controlling interests, Redeemable preferred non-controlling interests and Stockholders' Equity, for additional information.

Purchase and sale agreement for environmental attributes

On November 29, 2021, the Company entered into a purchase and sale agreement with NextEra for the environmental attributes generated by the RNG Fuels business. Under this agreement, the Company plans to sell a minimum of 90% of the environmental attributes generated and will receive net proceeds based on the agreed upon price less a specified discount. A specified volume of environmental attributes sold per quarter will incur a fee per environmental attribute in addition to the specified discount. The agreement was effective beginning January 1, 2022. For the years ended December 31, 2023 and 2022, the Company earned net revenues after discount and fees of $84,537 and $76,920, respectively under this contract which was recorded as part of Revenues - RNG fuel and Fuel Station Services. Please see Note 2. Summary of Significant Accounting Policies for additional information.

Commodity swap contracts under ISDA and REC sales contracts

The Company entered into an ISDA agreement with NextEra in November 2019. Pursuant to the agreement, the Company entered into commodity swap contracts on a periodic basis. As of December 31, 2023 and 2022, there were three commodity swap contracts outstanding. The Company records the realized and unrealized gain (loss) on these commodity swap contracts as part of Revenues - Renewable Power. Please see Note 9. Derivative Instruments and Fair Value Measurements for additional information. Additionally, the Company has contracts to sell RECs and capacity to NextEra on multiple Renewable Power facilities at market price. The Company recorded $6,614 and $5,495 as revenues earned under these contracts.

Purchase of investments from Related Parties

In August 2021, the Company acquired a 100% of the ownership interests in Reynolds, an RNG production facility for $12,020 which was funded with cash on hand. Reynolds held an equity investment of 1,570 Class B units in GREP representing 20% interest for a cash consideration of $1,570 which owns 50% of Biotown, a power generation facility under development to convert to an RNG facility. The Reynolds transaction was an asset acquisition from an affiliate under common control. The Company accounts for its 20% equity investment in GREP under the equity method. The Company recorded $(1,212) and $2,302 as its share of net (loss) income for the years ended December 31, 2023 and 2022.

Sales contracts with Related Parties

The Company's wholly owned subsidiary, OPAL Fuel Station Services contracted with Pine Bend in December 2020, Noble Road in March 2021, Emerald in December 2021 to provide the same services. Additionally, OPAL Fuel Station Services provides the same services to all wholly-owned subsidiaries of the Company. The revenues earned from these entities are fully eliminated in the consolidated financial statements.

The term of this contract runs for a term of 10 years. The Company receives non-cash consideration in the form of RINs or LCFSs for providing these services and recognizes the RINs or LCFSs received as inventory based on their estimated fair value at contract inception. The Pine Bend and Noble Road came online in the first and third quarter of 2022 and Emerald in the third quarter of 2023. For the years ended December 31, 2023 and 2022, the Company earned environmental processing fees of $2,615 and $709, net of inter segment elimination under this agreement which are included in Fuel Station Services revenues in the consolidated statements of operations.

Service agreements with Related Parties

On December 31, 2020, OPAL Fuels signed a management, operations, and maintenance services agreement (“Administrative Services Agreement”) with a subsidiary of Fortistar, pursuant to which Fortistar provides management, operations, and maintenance services to the Company. The agreement expires on December 31, 2023 with an auto renewal option on an annual basis, unless either party chooses to terminate with a written notice of 180 days termination occurs earlier due to dissolution of the Company or the agreement is terminated by the Company’s secured lenders in certain circumstances. The agreement provides for payment of service fees based on actual time incurred at contractually agreed rates provided for in the Administrative Services Agreement, as well as a fixed annual payment of $580 per year adjusted annually for inflation. Additionally, the agreement provides for the Company to receive credits for any services provided by the Company's employees to Fortistar. For the year ended December 31, 2023 and 2022, there have been no material services provided by the Company's employees to Fortistar.

In June 2021, the company entered into a management services agreement with Costar Partners LLC (“Costar”), an affiliate of Fortistar. Pursuant to the agreement, Costar provides information technology (“IT”) support services, software use, licensing services, management of third party infrastructure and security services and additional IT services as needed by the Company. The agreement provides for Costar to be compensated based on actual costs incurred and licensing fees per user for certain software applications. The agreement expires in June 2024 unless the termination occurs earlier due to dissolution of the Company or it is terminated by the Company’s secured lenders in certain circumstances.

On October 5, 2023, Ms.Ann Anthony gave notice of her intention to resign as Chief Financial Officer ("CFO") of the Company. On October 10, 2023, the board of directors of the Company appointed Mr.Scott Contino as Interim CFO. Mr.Contino has served as Fortistar's CFO for the past eighteen years. In connection with the appointment, the Company entered into an interim services agreement ("Interim Services Agreement") with Fortistar in accordance with the terms and conditions of the existing Administrative Services Agreement. Pursuant to the Interim Services Agreement, the Company will pay Fortistar an agreed hourly rate, such that the monthly fee does not exceed $50,000, on a cumulative basis. For the year ended December 31, 2023, the Company paid $128 which is included in Selling, general and administrative expenses in the consolidated statement of operations.

The following table summarizes the various fees recorded under the agreements described above which are included in "Selling, general, and administrative" expenses:


	Twelve Months Ended December 31,
	2023		2022
Staffing and management services	$	1,834	$	2,154
Rent - fixed compensation	668		604
IT services	2,954		2,205
Total	$	5,456	$	4,963

The following table presents the various balances for related parties included in our consolidated balance sheets as of December 31, 2023 and 2022.


		December 31,
	Location in Balance Sheet	2023		2022
Assets:
Trade AR - NextEra	Accounts receivable, related party	18,696		12,421
Liabilities:
Payables to equity method investment entities	Accounts payable, related party	5,692		5,030
NextEra	Accounts payable, related party	501		501
Staffing and management services - Fortistar	Accounts payable, related party	622		677
IT services - Costar	Accounts payable, related party	209		168
Total liabilities - related party		$	7,024	$	6,376

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-URI https://asc.fasb.org//1943274/2147480990/946-20-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147480990/946-20-50-6

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 2
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (e)
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-URI https://asc.fasb.org//1943274/2147481062/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147483326/850-10-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147483326/850-10-50-6

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483326/850-10-50-1

+ Details

Summary of Significant Accounting Policies - Variable Interest Entities, Cash, Cash Equivalents and Restricted Cash and Short Term Investments Narrative (Details) $ in Thousands			12 Months Ended
	Sep. 14, 2023 project	Nov. 29, 2021 project	Dec. 31, 2023 USD ($) variable_interest_entity	May 30, 2023 deconsolidated_entity	May 29, 2023 variable_interest_entity	Dec. 31, 2022 USD ($) variable_interest_entity
Variable Interest Entity [Line Items]
Number of deconsolidated entities \| deconsolidated_entity				2
Number of variable interest entities consolidated \| variable_interest_entity			2		2	4
Number of noncontrolling interests in renewable natural gas project subsidiaries \| project		4
Restricted cash held in escrow						$ 16,849
Cash held in restricted account						8,581
Short term investments			$ 9,875			64,976
Sunoma Loan
Variable Interest Entity [Line Items]
Interest reserve						1,127
Opal Term Loan II \| Secured Debt
Variable Interest Entity [Line Items]
Contribution to joint venture						$ 5,845
NEW JERSEY
Variable Interest Entity [Line Items]
Number of noncontrolling interests in renewable natural gas project subsidiaries \| project	2
Paragon
Variable Interest Entity [Line Items]
Percentage of ownership			50.00%	50.00%
Paragon \| Emerald And Sapphire
Variable Interest Entity [Line Items]
Percentage of ownership transferred				50.00%
OPAL L2G
Variable Interest Entity [Line Items]
Percentage of ownership	50.00%
SJI
Variable Interest Entity [Line Items]
Percentage of ownership	50.00%		50.00%
SJI \| RNG Atlantic
Variable Interest Entity [Line Items]
Contributions to project subsidiary			$ 2,115
SJI \| NEW JERSEY
Variable Interest Entity [Line Items]
Percentage of ownership	50.00%

Commitments and Contingencies (Details) $ in Thousands	1 Months Ended	12 Months Ended	21 Months Ended
Commitments and Contingencies (Details) $ in Thousands	Jul. 31, 2015	Dec. 31, 2023 USD ($) contract standby_letters_of_credit	Mar. 15, 2024 USD ($)	Dec. 31, 2022 USD ($) standby_letters_of_credit
Line of Credit Facility [Line Items]
Number of standby letters of credit held \| standby_letters_of_credit		9		9
VEC Partners, Inc. dba CEI Builders (“CEI”) \| MD Digester, LLC
Line of Credit Facility [Line Items]
Estimated loss per contract		$ 14,000
Estimated loss from claim		$ 28,000
Compressed Natural Gas (CNG)
Line of Credit Facility [Line Items]
Number of purchase option contracts to provide CNG \| contract		2
Compressed Natural Gas (CNG) \| Minimum
Line of Credit Facility [Line Items]
Term of purchase option contract (in years)		7 years
Compressed Natural Gas (CNG) \| Maximum
Line of Credit Facility [Line Items]
Term of purchase option contract (in years)		10 years
Fuel
Line of Credit Facility [Line Items]
Term of purchase option contract (in years)	10 years
Standby Letters of Credit
Line of Credit Facility [Line Items]
Standby letters of credit outstanding balance		$ 13,750		$ 2,292
Standby Letters of Credit \| Subsequent Event
Line of Credit Facility [Line Items]
Draws on standby letters of credit			$ 0

Reportable Segments and Geographic Information - Total Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets:	$ 754,609	$ 644,856
Equity Method Investment(s)	207,099	51,765	$ 47,150
Operating Segments \| Renewable Power
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets:	37,479	43,468
Operating Segments \| RNG Fuel
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets:	342,176	376,933
Operating Segments \| Fuel Station Services
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets:	152,625	90,486
Operating Segments \| Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets:	$ 15,230	$ 82,204

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (bb)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/exampleRef
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Reference 7: http://www.xbrl.org/2003/role/exampleRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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+ Details

Property, Plant, and Equipment, Net - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Interest capitalized	$ 5,475	$ 3,678
Depreciation	$ 13,481	$ 11,892

Redeemable non-controlling interests, Redeemable preferred non-controlling interests and Stockholders' Equity

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Redeemable non-controlling interests, Redeemable preferred non-controlling interests and Stockholders' Equity

Common stock

As of December 31, 2023, there are (i) 29,701,146 shares of Class A common stock issued and outstanding, (ii) 144,399,037 shares of New OPAL Class D common stock issued and outstanding, (iii) no shares of Class B common stock, par value $0.0001 per share, of (“Class B common stock”) issued and outstanding (shares of Class B common stock do not have any economic value except voting rights as described below) and (iv) no shares of Class C common stock, par value $0.0001 per share, (“ Class C common stock”) issued and outstanding (shares of Class D common stock do not have any economic value except voting rights as described below).

During the first quarter of 2023, Meteora exercised the put option pursuant to the terms of the Forward Purchase Contract. The Company repurchased 1,635,783 shares at a price of $10.02 per share. The Company recorded $11,614 representing the fair value of the treasury stock as part of stockholders' deficit and $4,777 as an offset to the derivative financial liability, current on its consolidated balance sheet as of December 31, 2023.

In March 2023, the Company issued 49,633 shares to certain warrant holders as consideration for their prior agreement to tender all warrants held by the warrant holders in the Company's voluntary exchange offer which closed on December 22, 2022. The Company recorded $338 representing the fair value of the shares issued based on the closing price on March 30, 2023 as part of Loss on warrant exchange on its consolidated statement of operations for the year ended December 31, 2023.

ATM Program

On November 17, 2023, OPAL Fuels Inc. (the “Company”) entered into an At Market Issuance Sales Agreement (the “ATM Program”) with B. Riley Securities, Inc., Cantor Fitzgerald & Co. and Stifel, Nicolaus & Company, Incorporated (each, an “Agent,” and collectively, the “Agents”) pursuant to which the Company may issue and sell shares of its Class A common stock having an aggregate offering price of up to $75 million from time to time through the Agents. Pursuant to the terms and conditions of the agreement, the Agents will use commercially reasonable efforts consistent with their normal trading and sales practices and applicable state and federal laws, rules and regulations to sell the Company’s Class A common stock from time to time, based upon the Company’s instructions (including any price, time or size limits or other customary parameters or conditions the Company imposes). The Company is not obligated to make any sales of common stock under the Sales Agreement.

Unless earlier terminated as provided below, the Sales Agreement will automatically terminate upon the issuance and sale of all of the Class A common stock subject to the Sales Agreement. The Sales Agreement may also be terminated by the Company or the Agents at any time upon two days’ notice to the other party, or by the Agents at any time in certain circumstances, including the occurrence of a material adverse change in the Company.The Company will pay each Agent, upon the sale by such Agent of Class A common stock pursuant to the Sales Agreement, an amount equal to up to 3.0% of the gross proceeds of each such sale of Class A common stock. The Company has also provided the Agents with customary indemnification rights.

Under the ATM Program, the Company issued 90,103 shares of Class A common stock in December 2023 at prices ranging between $5.52 and $5.85 and received net proceeds of $366.

Redeemable preferred non-controlling interests

On November 29, 2021, as part of an Exchange Agreement, the Company issued 300,000 Series A-1 preferred units to Hillman in return for Hillman’s non-controlling interest in four RNG project subsidiaries.

Upon completion of the Business Combination, the Company assumed Series A-1 preferred units and Series A preferred units which were issued and outstanding by OPAL Fuels. The Company recorded the Series A-1 preferred units and Series A preferred units as Redeemable preferred non-controlling interests. The Company has elected to adjust the carrying value of the preferred units to the redemption value at the end of each reporting period by immediately amortizing the issuance costs in the first reporting period after issuance of the preferred units.

During the third quarter of 2023, the Company repaid all outstanding paid-in-kind preferred dividends at that time.


	Series A-1 preferred units			Series A preferred units			Total
	Units	Amount		Units	Amount
Balance, December 31, 2022	300,000	$	32,736	1,000,000	$	105,406	$	138,142
Paid-in-kind dividends attributable to OPAL Fuels	—	2,168		—	7,051		9,219
Paid-in kind dividends attributable to Class A common stockholders	—	422		—	1,370		1,792
Repayment of paid-in-kind preferred dividends	—	(4,722)		—	(11,814)		(16,536)
Balance, December 31, 2023	300,000	$	30,604	1,000,000	$	102,013	$	132,617

Terms of Redeemable Preferred Units

The Series A and Series A-1 preferred units (together the “Preferred Units”) are subject to substantially the same terms and features which are listed below:

Voting: The Series A-1 preferred units to Hillman do not have any voting rights. The Series A preferred units issued to NextEra have limited rights to prevent the Company from taking certain actions including (i) major issuances of new debt or equity (ii) executing transactions with affiliates which are not at arm-length basis (iii) major dispositions of assets and (iv) major acquisitions of assets outside of the Company’s primary business.

Dividends: The Preferred Units are entitled to receive dividends at the rate of 8% per annum. Dividends begin accruing for each unit from the date of issuance and are payable each quarter end regardless of whether they are declared. The dividends are mandatory and cumulative. The Company is allowed to elect to issue additional Preferred Units (paid-in-kind) in lieu of cash for the first eight dividend payment dates. The Company elected to pay the dividends to be paid-in-kind for all periods presented. The annual dividend rate increases to 12% if certain events of defaults occur. Additionally, the dividend rate increases by 2% for each unrelated uncured event of default up to a maximum of 20%.

Liquidation preference: In the event of liquidation of the Company, each holder of Series A units and Series A-1 units is entitled to be paid on pro-rata basis the original issue price of $100 per unit plus any accrued and unpaid dividends out of the assets of the Company available for distribution after payment of the Company’s debt and liabilities and liquidation expenses.

Redemption: Any time after issuance, the Company may redeem the Redeemable preferred units for a price equal to original issue price of $100 per unit plus any accrued and unpaid dividends. Holders of the Preferred Units may redeem for an amount equal to original issue price of $100 per unit plus any accrued and unpaid dividends (i) upon the occurrence of certain change in control event (ii) at the end of four years from the date of issuance, except that the Preferred Units issued to Hillman can only be redeemed 30 days after the fourth year anniversary of the first issuance of Preferred Units to NextEra. The maturity date is determined to be the date at which the Holder’s redemption option becomes exercisable as this is the date on which both the Company and the Holder may redeem the Preferred Units. The maturity date may be as early as November 29, 2025 but shall not occur later than June 30, 2026.

Conversion: Holders may elect to convert Preferred Units into common units in the event that the Company fails to redeem the Preferred Units under an optional redemption. The annual dividend rate shall increase to 12% and will further increase to 14% after one year, and thereafter by 2% every 90 days up to a maximum of 20%. The Company must also redeem all NextEra Series A preferred units on which the redemption option has been exercised prior to redeeming any Hillman Series A-1 preferred units. If elected, the Holder may convert all or a portion of its Preferred Units into a number of common units equal to the number of Preferred Units, multiplied by $100, plus accrued and unpaid cash dividends, divided by the conversion price. The conversion price is equal to the value of the Company’s common units determined as follows, and reduced by (i) a 20% discount if conversion occurs during the first year of delayed redemption, (ii) a 25% discount during the 2nd year, and (iii) a 30% discount thereafter:

1. Using 20-day volume-weighted average price (“VWAP”) of the Company's common shares.

2. Otherwise the estimated proceeds to be received by the Holder of a common unit if the net assets of the Company were sold at fair market value and distributed.

Redeemable non-controlling interests

Upon consummation of the Business Combination, OPAL Fuels and its members caused the existing Limited Liability Company Agreement to be amended and restated. In connection therewith, all of the common units of OPAL Fuels issued and outstanding immediately prior to the Business Combination were re-classified into 144,399,037 Class B Units. Each Class B Unit is paired with a single non-economic share of Class D common stock issued by the Company. Each pair of Class B Unit and a single share of Class D common stock is exchangeable to either a single share of Class A common stock or a single share of Class C common stock at the holder's option. Upon an exchange for Class A common stock, the Company has the option to redeem shares for cash at their market value.

Redeemable non-controlling interests have been presented as mezzanine equity in the consolidated statements of change in Redeemable non-controlling interests, Redeemable preferred non-controlling interests and stockholders' (deficit) equity. At each balance sheet date, the Redeemable non-controlling interests are adjusted up to their redemption value if necessary, with an offset in Stockholders' equity. As of December 31, 2023, the Company recorded $(312,396) to adjust the carrying value to their redemption value based on a five-day VWAP of $5.56 per share.

Related Parties (Tables)

12 Months Ended

Dec. 31, 2023

Fees Upon Entering Into Management Services Agreement with Related Party and Various Balances for Related Parties

The following table summarizes the various fees recorded under the agreements described above which are included in "Selling, general, and administrative" expenses:


	Twelve Months Ended December 31,
	2023		2022
Staffing and management services	$	1,834	$	2,154
Rent - fixed compensation	668		604
IT services	2,954		2,205
Total	$	5,456	$	4,963

The following table presents the various balances for related parties included in our consolidated balance sheets as of December 31, 2023 and 2022.


		December 31,
	Location in Balance Sheet	2023		2022
Assets:
Trade AR - NextEra	Accounts receivable, related party	18,696		12,421
Liabilities:
Payables to equity method investment entities	Accounts payable, related party	5,692		5,030
NextEra	Accounts payable, related party	501		501
Staffing and management services - Fortistar	Accounts payable, related party	622		677
IT services - Costar	Accounts payable, related party	209		168
Total liabilities - related party		$	7,024	$	6,376

Property, Plant, and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Useful Lives of Property, Plant and Equipment, Net

Depreciation is computed using the straight-line method over the estimated useful lives of the assets as follows:


Plant and equipment						5 - 30 years
CNG/RNG fueling stations						10-20 years
Construction in progress						N/A
Buildings						40 years
Land						N/A
Service equipment						5-10 years
Leasehold improvements						shorter of lease term or useful life
Vehicles						7 years
Office furniture and equipment						5-7 years
Computer software						3 years
Land lease - finance lease						Lease term
Vehicles - finance lease						shorter of lease term or useful life
Other						7 years

Property, plant, and equipment, net, consisted of the following as of December 31, 2023 and December 31, 2022:


	December 31, 2023		December 31, 2022
Plant and equipment	$	205,188	$	201,655
CNG/RNG fueling stations	51,749		34,567
Construction in progress (1)	175,060		152,105
Buildings	2,585		2,585
Land	1,303		1,303
Service equipment	2,481		1,888
Leasehold improvements	815		815
Vehicles	489		313
Office furniture and equipment	307		307
Computer software	277		277
Land Lease - finance lease	6,469		—
Vehicles - finance leases	2,580		1,236
Other	591		487
	449,894		397,538
Less: accumulated depreciation	(110,401)		(100,215)
Property, plant, and equipment, net	$	339,493	$	297,323

(1) Includes $5,475 of interest capitalized from our general borrowings for the year ended December 31, 2023 and $3,678 for the year ended December 31, 2022.

Borrowings (Tables)

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Schedule of Borrowings

The following table summarizes the borrowings under the various debt facilities as of December 31, 2023 and December 31, 2022:


	December 31, 2023		December 31, 2022
Senior Secured Credit Facility, term loan	$	—	$	15,250
Less: current portion	—		(15,250)
Senior Secured Credit Facility, term loan	—		—
Senior Secured Credit Facility, working capital facility	—		7,500
Less: current portion	—		(7,500)
Senior Secured Credit Facility, working capital facility	—		—
OPAL Term Loan	186,618		96,090
Less: unamortized debt issuance costs	(10,086)		(1,758)
Less: current portion	—		(27,732)
OPAL Term Loan, net of debt issuance costs	176,532		66,600
Sunoma Loan	22,453		23,000
Less: unamortized debt issuance costs	(835)		(908)
Less: current portion	(1,608)		(380)
Sunoma Loan, net of debt issuance costs	20,010		21,712
Convertible Note Payable	—		28,528
Less: current portion	—		(28,528)
Convertible Note Payable	—		—
Municipality Loan	—		76
Less: current portion	—		(76)
Municipality Loan	—		—
Non-current borrowings total	$	196,542	$	88,312

Schedule of Principal Maturities of Debt

As of December 31, 2023, principal maturities of debt are expected as follows, excluding any undrawn debt facilities as of the date of the consolidated balance sheet:


	OPAL Term Loan		Sunoma Loan		Total
Fiscal year:
2024	$	—	$	1,608	$	1,608
2025	22,394		1,743		24,137
2026	22,394		1,883		24,277
2027	22,394		2,036		24,430
2028	119,436		4,232		123,668
Thereafter	—		10,951		10,951
	$	186,618	$	22,453	$	209,071

Schedule of Interest Expense on Borrowings

The following table summarizes the Company's total interest and financing expense, net for the year ended December 31, 2023 and 2022:


	Twelve Months Ended December 31,
	2023		2022
Senior Secured Credit Facility	$	311	$	3,779
Municipality loan	—		7
Convertible Note Payable	1,579		413
Sunoma Loan	1,803		1,810
OPAL Term Loan (1)	5,231		894
Commitment fees and other finance fees	1,491		1,027
Interest expense on finance leases	105		45
Amortization of deferred financing cost	1,720		1,943
Interest income	(2,934)		(3,278)
Total interest and financing expense, net	$	9,306	$	6,640

Redeemable non-controlling interests, Redeemable preferred non-controlling interests and Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands						1 Months Ended		3 Months Ended	12 Months Ended
	Nov. 17, 2023 USD ($)	Jan. 23, 2023 USD ($) shares	Jul. 21, 2022 $ / shares shares	Jul. 20, 2022 shares	Nov. 29, 2021 project shares	Dec. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2023 $ / shares shares	Mar. 31, 2023 $ / shares shares	Dec. 31, 2023 USD ($) dividend_payment $ / shares shares	Dec. 31, 2022 USD ($) shares
Preferred Units [Line Items]
Stock issued (in shares)										1,000,000
Fair value of treasury shares acquired \| $									$ 11,614
Conversion of stock (in shares)					300,000		49,633
Loss on warrant exchange \| $									338	$ 3,368
Proceeds from issuance of shares of Class A common stock under the ATM program, net \| $									$ 366	0
Number of noncontrolling interests in renewable natural gas project subsidiaries \| project					4
Stock subscribed (in shares)					1,000,000
Amount sold \| $										$ 100,000
Preferred stock dividend rate									8.00%
Preferred stock, number of dividend payments to elect to issue additional Preferred Units \| dividend_payment									8
Preferred stock dividend rate, event of default									12.00%
Preferred stock dividend rate, event of default, increase for each event									2.00%
Preferred stock dividend rate, event of default, maximum after increases									20.00%
Preferred stock liquidation preference (in dollars per share) \| $ / shares						$ 100			$ 100
Preferred stock redemption price (in dollars per share) \| $ / shares						100			$ 100
Preferred stock redemption period after which redeemable									4 years
Preferred stock redemption period after fourth anniversary									30 days
Preferred stock dividend rate if failed to redeem									12.00%
Preferred stock dividend rate, increase to after one year if failed to redeem									14.00%
Preferred stock dividend rate, quarterly increase after one year if failed to redeem									2.00%
Preferred stock dividend rate if failed to redeem, maximum									20.00%
Preferred stock conversion price (in dollars per share) \| $ / shares						100			$ 100
Preferred stock conversion, first year discount									20.00%
Preferred stock conversion, second year discount									25.00%
Preferred stock conversion, thereafter discount									30.00%
Preferred stock conversion, VWAP period									20 days
Redemption price (in dollars per share) \| $ / shares						$ 5.56			$ 5.56
Meteora \| Forward Purchase Agreement
Preferred Units [Line Items]
Contingent consideration, price (in dollars per share) \| $ / shares			$ 10.02				$ 10.02	$ 10.02
Fair value of treasury shares acquired \| $		$ 11,614							$ 11,614
Offset to derivative financial liability \| $						$ 4,777			$ 4,777
Agent \| Scenario, Plan
Preferred Units [Line Items]
Aggregate offering price, up to \| $	$ 75,000
Class A common stock
Preferred Units [Line Items]
Common stock, shares issued (in shares)						29,701,146			29,701,146	29,477,766
Common stock, shares outstanding (in shares)						29,701,146			29,701,146	29,477,766
Common stock, par value (in dollars per share) \| $ / shares						$ 0.0001			$ 0.0001
Class A common stock \| Agent
Preferred Units [Line Items]
Stock issued (in shares)									90,103
Percentage of gross proceeds on each sale	3.00%
Proceeds from issuance of shares of Class A common stock under the ATM program, net \| $						$ 366
Class A common stock \| Agent \| Minimum
Preferred Units [Line Items]
Sales price (in dollars per share) \| $ / shares						$ 5.52			$ 5.52
Class A common stock \| Agent \| Maximum
Preferred Units [Line Items]
Sales price (in dollars per share) \| $ / shares						$ 5.85			$ 5.85
Class D common stock
Preferred Units [Line Items]
Common stock, shares issued (in shares)						144,399,037			144,399,037	144,399,037
Common stock, shares outstanding (in shares)						144,399,037			144,399,037	144,399,037
Common stock, par value (in dollars per share) \| $ / shares						$ 0.0001			$ 0.0001
Class C common stock
Preferred Units [Line Items]
Common stock, shares issued (in shares)						0			0	0
Common stock, shares outstanding (in shares)						0			0	0
Common stock, par value (in dollars per share) \| $ / shares						$ 0.0001			$ 0.0001
ArcLight Class A Common Stock \| Meteora \| Forward Purchase Agreement
Preferred Units [Line Items]
Stock issued (in shares)		1,635,783		2,000,000				1,635,783
Common Class B
Preferred Units [Line Items]
Common stock, shares issued (in shares)						0			0	0
Common stock, shares outstanding (in shares)						0			0	0
Common stock, par value (in dollars per share) \| $ / shares						$ 0.0001			$ 0.0001
Common Class B \| Opal Fuels
Preferred Units [Line Items]
Stock issued (in shares)			144,399,037
Redeemable non-controlling interests
Preferred Units [Line Items]
Change in redemption value of Redeemable non-controlling interests \| $									$ (312,396)

Investments in Other Entities

12 Months Ended

Dec. 31, 2023

Equity Method Investments and Joint Ventures [Abstract]

Investments in Other Entities

Investment in Other Entities

have reclassified our portion of income (loss) from equity method investments to Operating income for all periods presented.

Formation Of A New Joint Venture

On September 14, 2023, OPAL L2G, a wholly-owned indirect subsidiary of the Company, entered into the Agreement with SJI LRNG, a wholly-owned indirect subsidiary of SJI, establishing the terms and conditions of governance and operation of the SJI Joint Venture. The purpose of the SJI Joint Venture, which is owned 50/50 by OPAL L2G and SJI LRNG, is to develop, construct, own and operate Facilities to produce RNG using biogas generated by certain landfills. The Agreement governs the terms and conditions of capital contributions to be made by the SJI Joint Venture members to fund the development, construction and operations of the Facilities. The Agreement requires members of the SJI Joint Venture to contribute their respective share (50% each) of such capital requirements. The Agreement initially contemplates two RNG projects (RNG Atlantic and RNG Burlington) in New Jersey with each RNG project represented as a separate series of membership interests, also owned 50-50 by the members. Further, the Agreement provides for the SJI Joint Venture to enter into a MSA, O&M Agreement, and dispensing agreement with certain wholly-owned, indirect subsidiaries of the Company. The MSA establishes the terms and conditions for the day-to-day administration of the projects, including responsibility for managing the development and overseeing the construction of the Facilities. The O&M Agreement establishes the terms and conditions for operating and maintaining the Facilities once construction is completed. The Dispensing Agreement provides for the acquisition, marketing and sale of the Environmental Attributes associated with RNG produced by the Facilities.

Upon the execution of the above transaction, the Company reassessed its equity interests in the SJI Joint Venture under ASC 810, Consolidation and determined that the Company does not have a controlling financial interest in SJI Joint Venture under ASC 810 because the governance of the joint venture is driven by a board jointly controlled by the joint venture partner and OPAL equally and there are substantive participating rights held by the joint venture partner in the significant activities of SJI Joint Venture. As of December 31, 2023, the Company contributed $2,115 towards RNG Atlantic.

Deconsolidation of Emerald and Sapphire

On May 30, 2023, the Company together with a third-party environmental solutions company formed Paragon. The Company owns 50% of the ownership interest in Paragon. Concurrent to the formation of Paragon, the Company contributed its 50% ownership interests in Emerald and Sapphire to Paragon.

On May 30, 2023, OPAL Fuels Intermediate Holdco 2 LLC (“OPAL Intermediate Holdco 2”), a wholly-owned indirect subsidiary of the Company, assigned to Paragon its rights and obligations under its existing senior secured credit facility, OPAL Term Loan II.

Upon the execution of the above two transactions, the Company reassessed its equity interests in Emerald and Sapphire under ASC 810, Consolidation and determined that the Company does not have a controlling financial interest in Paragon under ASC 810 because the governance of the Paragon is driven by a board jointly controlled by the joint venture partner and OPAL equally and there are substantive participating rights held by the joint venture partner in the significant activities of Paragon.

Prior to May 30, 2023, the Company consolidated these two entities in accordance with the variable interest entity model guidance under ASC 810, Consolidation. Additionally, the Company deconsolidated $2,765 capitalized interest on these two projects. Upon deconsolidation, the Company remeasured the fair value of the retained investment and recognized a gain of $122,873 in the consolidated statement of operations for the year ended December 31, 2023 and a corresponding increase in its basis in Investment in Other Entities on its consolidated balance sheet as of December 31, 2023. The Company determined that the gain on deconsolidation is attributable to the construction in progress and, therefore, will be amortized over the useful life of the asset which begins on the date the asset is placed in service. The fair value of the retained investment was measured based on a discounted cash flows model in which the future net cash flows from the two RNG facilities were discounted to their present value using a discount factor of 14%.

The following table shows the movement of Investment in other entities:


	Pine Bend			Noble Road			GREP			SJI			Paragon			Total
Percentage of ownership	50		%	50		%	20		%	50		%	50		%

Balance at December 31, 2021	$	21,188		$	24,516		$	1,446		$	—		$	—		$	47,150
Additional investment representing capitalized interest	597			—			—			—			—			597
Other comprehensive income	—			—			334			—			—			334
Net income from equity method investments	733			2,749			2,302			—			—			5,784
Distributions from return of investment in equity method investment (2)	—			(2,100)			—			—			—			(2,100)
Balance at December 31, 2022	22,518			25,165			4,082			—			—			51,765
Deconsolidation of Emerald and Sapphire	—			—			—			—			34,662			34,662
Deconsolidation of deferred financing costs and capitalized interest	—			—			—			—			1,383			1,383
Net income from equity method investment	4,333			5,642			(1,212)			(547)			364			8,580
Reclassification of adjustments into earnings	—			—			(334)			—			—			(334)
Contribution by the Company	—			—			—			2,114			6,200			8,314
Distributions from return on investment in equity method investment (1)	(5,066)			(6,291)			(521)			—			(364)			(12,242)
Distributions from return of investment in equity method investment (2)	(459)			(1,159)			—			—			(3,221)			(4,839)
Accumulated other comprehensive loss	—			—			—			—			(8)			(8)
Gain on deconsolidation of Emerald and Sapphire (3)	—			—			—			—			122,873			122,873
Amortization of basis difference (4)	(264)			(1,183)			—			—			(1,608)			(3,055)
	$	21,062		$	22,174		$	2,015		$	1,567		$	160,281		$	207,099

(1) Recorded as part of cash flows from operating activities for the year ended December 31, 2023.

(2) Recorded as part of cash flows from investing activities for the years ended December 31, 2023 and 2022.

(3) Recorded as part of Other income in our consolidated statement of operations for the year ended December 31, 2023.

(4) Reflected in Income from equity method investments in the consolidated statement of operations for the year ended December 31, 2023.

Note receivable

In August 2021, the Company acquired 100% ownership interest in Reynolds which held a note receivable of $10,450 to Biotown. The Note receivable had a maturity date of July 15, 2027 and carried an interest rate of 12.5% of which 8% is payable in cash on a quarterly basis from the inception of the loan and 4.5% payment-in-kind interest adding to the outstanding debt balance until the facility becomes operational.

On July 15, 2022, Biotown repaid the total amount outstanding under the Note receivable including paid-in-kind interest and prepayment penalty.

The Note receivable also entitles Reynolds to receive 4.25% of any revenue-based distributions made up to a maximum of $4,500 over the term of the debt. The Company recorded the fair value of the Note receivable — variable fee component of $1,538 as an allocation of the initial investment balance of $10,450 and recorded payment-in-kind interest income of $413 and $288 as a reduction to interest and financing expense, net in the consolidated statement of operations for the years ended December 31, 2023 and 2022, respectively.

The Note receivable - variable fee component of $2,302 and $1,942 is recorded as a long-term asset on its consolidated balance sheets as of December 31, 2023 and December 31, 2022, respectively.

The following table summarizes financial information of the unconsolidated entities:


	December 31, 2023		December 31, 2022
Current assets	$	25,114	$	14,563
Non-current assets	171,633		109,414
Current liabilities	26,205		6,765
Non-current liabilities	34,021		13,825
Members' equity	136,521		103,388

The following table summarizes the income from equity method investments:


	Twelve Months Ended
		December 31, 2023		December 31, 2022
Revenue (1)		$	50,074	$	58,013
Gross profit		12,065		41,932
Net income		6,323		29,983

Net income from equity method investments (2)		$	5,525	$	5,784

(1) Revenues for the year ended December 31, 2022 include a realized gain of $32,796 from commodity swap contracts on our equity method investment, GREP for the year ended December 31, 2022.

(2) Net income from equity method investments represents our portion of the net income from equity method investments.