UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or Section 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 25, 2021

ARCLIGHT CLEAN TRANSITION CORP. II

(Exact name of registrant as specified in its charter)

(617) 531-6300

Registrant’s telephone number, including area code

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation to the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.

Emerging growth company  ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Item 8.01. Other Events.

On March 25, 2021, ArcLight Clean Transition Corp. II (the “Company”) consummated an initial public offering (the “IPO”) of 31,116,305 units (the “Units”) at an offering price of $10.00 per Unit, which includes an additional sale of 3,616,305 units, pursuant to the partial exercise of the underwriters’ option to purchase an additional 4,125,000 Units at the initial public offering price to cover over-allotments, and a private placement with ArcLight CTC Holdings II, L.P. of 9,223,261 private placement warrants at a price of $1.00 per warrant (the “Private Placement”). The net proceeds from the IPO together with certain of the proceeds from the Private Placement, $311,163,050 in the aggregate (the “Offering Proceeds”), were placed in a trust account established for the benefit of the Company’s public shareholders and the underwriters of the IPO with Continental Stock Transfer & Trust Company acting as trustee. Except with respect to interest earned on the Offering Proceeds held in the trust account that may be released to the Company to pay its income taxes, if any, the Company’s amended and restated memorandum and articles of association will provide that the Offering Proceeds will not be released from the trust account (1) to the Company, until the completion of its initial business combination, or (2) to its public shareholders, until the earliest of (a) the completion of the its initial business combination, and then only in connection with those Class A ordinary shares that such shareholders properly elected to redeem, (b) the redemption of any public shares properly tendered in connection with a shareholder vote to amend the Company’s amended and restated memorandum and articles of association (A) to modify the substance or timing of the Company’s obligation to provide holders of its Class A ordinary shares the right to have their shares redeemed in connection with the Company’s initial business combination or to redeem 100% of its public shares if the Company does not complete its initial business combination within 24 months from the closing of the IPO, or 30 months from the closing of the IPO if the Company has executed a letter of intent, agreement in principle or definitive agreement for an initial business combination within 24 months from the closing of the IPO, or (B) with respect to any other provision relating to the rights of holders of its Class A ordinary shares, and (c) the redemption of the public shares if the Company has not consummated its business combination within 24 months from the closing of the IPO, or 30 months from the closing of the IPO if the Company has executed a letter of intent, agreement in principle or definitive agreement for an initial business combination within 24 months from the closing of the IPO, subject to applicable law.

An audited balance sheet as of March 25, 2021 reflecting receipt of the Offering Proceeds has been issued by the Company and is included as Exhibit 99.1 to this Current Report on Form 8-K.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: March 31, 2021

Exhibit 99.1

ARCLIGHT CLEAN TRANSITION CORP. II

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Shareholders and Board of Directors of

ArcLight Clean Transition Corp. II

Opinion on the Financial Statement

We have audited the accompanying balance sheet of ArcLight Clean Transition Corp. II (the “Company”) as of March 25, 2021, and the related notes (collectively referred to as the “financial statement”). In our opinion, the financial statement present fairly, in all material respects, the financial position of the Company as of March 25, 2021, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

This financial statement is the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statement based on our audit. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (“PCAOB”) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statement is free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audit we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audit included performing procedures to assess the risks of material misstatement of the financial statement, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statement. Our audit also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statement. We believe that our audit provides a reasonable basis for our opinion.

/s/ Marcum LLP

Marcum LLP

We have served as the Company’s auditor since 2021.

Hartford, CT

March 31, 2021

F-2

ARCLIGHT CLEAN TRANSITION CORP. II

BALANCE SHEET

MARCH 25, 2021

The accompanying notes are an integral part of the financial statement.

F-3

ARCLIGHT CLEAN TRANSITION CORP. II

NOTES TO FINANCIAL STATEMENT

NOTE 1. DESCRIPTION OF ORGANIZATION, BUSINESS OPERATIONS, AND LIQUIDITY

ArcLight Clean Transition Corp. II (the “Company”) is a blank check company incorporated as a Cayman Islands exempted company on January 13, 2021. The Company was incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses that the Company has not yet identified (“Business Combination”).

As of March 25, 2021, the Company had not yet commenced operations. All activity for the period from January 13, 2021 (inception) through March 25, 2021 relates to the Company’s formation and the initial public offering (the “Initial Public Offering”), which is described below. The Company will not generate any operating revenues until after the completion of its initial Business Combination, at the earliest. The Company will generate non-operating income in the form of interest income from the proceeds derived from the Initial Public Offering. The Company has selected December 31 as its fiscal year end.

The Company’s sponsor is ArcLight CTC Holdings II, L.P., a Delaware limited partnership (“Sponsor”). The registration statement for the Company’s Initial Public Offering was declared effective on March 22, 2021. On March 25, 2021, the Company consummated its Initial Public Offering of 31,116,305 units (the “Units” and, with respect to the Class A ordinary shares included in the Units being offered, the “Public Shares”), including the partial exercise of the underwriters’ option to purchase 3,616,305 additional Units (the “Over-Allotment Units”), at $10.00 per Unit, generating gross proceeds of approximately $311.2 million (see Note 3), and incurring offering costs of approximately $17.6 million, of which approximately $10.9 million was for deferred underwriting commissions (see Note 6).

Simultaneously with the closing of the Initial Public Offering, the Company consummated the private placement (“Private Placement”) of 9,223,261 warrants (each, a “Private Placement Warrant” and collectively, the “Private Placement Warrants”), at a price of $1.00 per Private Placement Warrant with the Sponsor, generating gross proceeds of approximately $9.2 million (see Note 4).

Upon the closing of the Initial Public Offering and the Private Placement, approximately $311.2 million ($10.00 per Unit) of the net proceeds of the Initial Public Offering and certain of the proceeds of the Private Placement were placed in a trust account (“Trust Account”) with Continental Stock Transfer & Trust Company acting as trustee and invested in United States “government securities” within the meaning of Section 2(a)(16) of the Investment Company Act of 1940, as amended, or the Investment Company Act, having a maturity of 185 days or less or in money market funds meeting certain conditions under Rule 2a-7 promulgated under the Investment Company Act which invest only in direct U.S. government treasury obligations, as determined by the Company, until the earlier of: (i) the completion of a Business Combination and (ii) the distribution of the Trust Account as described below.

The Company’s management has broad discretion with respect to the specific application of the net proceeds of its Initial Public Offering and the sale of Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. The Company’s initial Business Combination must be with one or more operating businesses or assets with a fair market value equal to at least 80% of the net assets held in the Trust Account (excluding the deferred underwriting commissions and taxes payable on the interest earned on the Trust Account) at the time the Company signs a definitive agreement in connection with the initial Business Combination. However, the Company will only complete a Business Combination if the post-transaction company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act.

The Company will provide its holders of the Public Shares (the “Public Shareholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a shareholder meeting called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The Public Shareholders will be entitled to redeem their Public Shares for a pro rata portion of the amount then in the Trust Account ($10.00 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations). The per-share amount to be distributed to Public Shareholders who redeem their Public Shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriters (as discussed in Note 6). These Public

F-4

ARCLIGHT CLEAN TRANSITION CORP. II

NOTES TO FINANCIAL STATEMENT

Shares were recorded at a redemption value and classified as temporary equity, in accordance with Accounting Standards Codification (“ASC”) Topic 480 “Distinguishing Liabilities from Equity.” In such case, the Company will proceed with a Business Combination if the Company has net tangible assets of at least $5,000,001 upon such consummation of a Business Combination and a majority of the shares voted are voted in favor of the Business Combination. If a shareholder vote is not required by law and the Company does not decide to hold a shareholder vote for business or other legal reasons, the Company will, pursuant to the amended and restated memorandum and articles of association which will be adopted by the Company upon the consummation of the Initial Public Offering (the “Amended and Restated Memorandum and Articles of Association”), conduct the redemptions pursuant to the tender offer rules of the U.S. Securities and Exchange Commission (the “SEC”), and file tender offer documents with the SEC prior to completing a Business Combination. If, however, a shareholder approval of the transactions is required by law, or the Company decides to obtain shareholder approval for business or legal reasons, the Company will offer to redeem shares in conjunction with a proxy solicitation pursuant to the proxy rules and not pursuant to the tender offer rules. Additionally, each Public Shareholder may elect to redeem their Public Shares irrespective of whether they vote for or against the proposed transaction. If the Company seeks shareholder approval in connection with a Business Combination, the holders of the Founder Shares prior to this Initial Public Offering (the “Initial Shareholders”) agreed to vote their Founder Shares (as defined in Note 5) and any Public Shares purchased during or after the Initial Public Offering in favor of a Business Combination. In addition, the Initial Shareholders agreed to waive their redemption rights with respect to their Founder Shares and Public Shares in connection with the completion of a Business Combination. In addition, the Company agreed not to enter into a definitive agreement regarding an initial Business Combination without the prior consent of the Sponsor.

Notwithstanding the foregoing, the Company’s Amended and Restated Memorandum and Articles of Association provide that a Public Shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), will be restricted from redeeming its shares with respect to more than an aggregate of 15% or more of the Class A ordinary shares sold in the Initial Public Offering, without the prior consent of the Company.

The Company’s Sponsor, executive officers and directors agreed not to propose an amendment to the Company’s Amended and Restated Memorandum and Articles of Association that would affect the substance or timing of the Company’s obligation to provide for the redemption of its Public Shares in connection with a Business Combination or to redeem 100% of its Public Shares if the Company does not complete a Business Combination, unless the Company provides the Public Shareholders with the opportunity to redeem their Class A ordinary shares in conjunction with any such amendment.

If the Company is unable to complete a Business Combination within 24 months from the closing of the Initial Public Offering, or March 25, 2023 (the “Combination Period”), the Company will (i) cease all operations except for the purpose of winding up; (ii) as promptly as reasonably possible but not more than ten business days thereafter, redeem the Public Shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account and not previously released to the Company to pay its income taxes, if any (less up to $100,000 of interest to pay dissolution expenses) divided by the number of the then-outstanding Public Shares, which redemption will completely extinguish Public Shareholders’ rights as shareholders (including the right to receive further liquidation distributions, if any); and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the remaining shareholders and the board of directors, liquidate and dissolve, subject in the case of clauses (ii) and (iii), to the Company’s obligations under Cayman Islands law to provide for claims of creditors and the requirements of other applicable law.

In connection with the redemption of 100% of the Company’s outstanding Public Shares for a portion of the funds held in the Trust Account, each holder will receive a full pro rata portion of the amount then in the Trust Account, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay the Company’s taxes payable (less up to $100,000 of interest to pay dissolution expenses).

The Initial Shareholders agreed to waive their liquidation rights with respect to the Founder Shares if the Company fails to complete a Business Combination within the Combination Period. However, if the Initial Shareholders should acquire Public Shares in or after the Initial Public Offering, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete a Business Combination within

F-5

ARCLIGHT CLEAN TRANSITION CORP. II

NOTES TO FINANCIAL STATEMENT

the Combination Period. The underwriters agreed to waive their rights to their deferred underwriting commission (see Note 6) held in the Trust Account in the event the Company does not complete a Business Combination within in the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Company’s Public Shares. In the event of such distribution, it is possible that the per share value of the residual assets remaining available for distribution (including Trust Account assets) will be only $10.00 per share initially held in the Trust Account. In order to protect the amounts held in the Trust Account, the Sponsor agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or other similar agreement or business combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Public Share and (ii) the actual amount per Public Share held in the Trust Account as of the date of the liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the Trust assets, less taxes payable, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriters of the Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). In the event that an executed waiver is deemed to be unenforceable against a third party, the Sponsor will not be responsible to the extent of any liability for such third-party claims. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have vendors, service providers (except the Company’s independent registered public accounting firm), prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account.

Liquidity and Management’s Plan

Prior to the completion of the initial public offering, the Company lacked the liquidity it needed to sustain operations for a reasonable period or time, which is considered to be one year from the issuance date of the financial statement. The Company has since completed its initial Public Offering at which time capital in excess of the funds deposited in the trust and/or used to fund offering expenses was released to the Company for general working capital purposes. Accordingly, management has since reevaluated the Company’s liquidity and financial condition and determined that sufficient capital exists to sustain operations one year from the date this financial statement is issued and therefore substantial doubt has been alleviated.

Risks and Uncertainties

Management continues to evaluate the impact of the COVID-19 global pandemic on the industry and has concluded that while it is reasonably possible that the virus could have a negative effect on the Company’s financial position, results of its operations, and/or search for a target company, the specific impact is not readily determinable as of the date of this financial statement. The financial statement does not include any adjustments that might result from the outcome of this uncertainty.

NOTE 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of presentation

The accompanying financial statement is presented in U.S. dollars in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the SEC.

Emerging growth company

The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved.

F-6

ARCLIGHT CLEAN TRANSITION CORP. II

NOTES TO FINANCIAL STATEMENT

Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statement with another public company which is neither an emerging growth company nor an emerging growth company which has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used.

Concentration of credit risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash accounts in a financial institution, which, at times, may exceed the Federal Deposit Insurance Corporation limit of $250,000. As of March 25, 2021, the Company has not experienced losses on these accounts.

Cash and cash equivalents

The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of March 25, 2021.

Cash held in Trust Account

As of March 25, 2021, the Company had approximately $311.2 million in cash held in the Trust Account.

Use of estimates

The preparation of financial statement in conformity with GAAP requires the Company’s 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 financial statement.

Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statement, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates.

Fair value of financial instruments

The fair value of the Company’s assets and liabilities, which qualify as financial instruments under the FASB ASC 820, “Fair Value Measurements and Disclosures,” approximates the carrying amounts represented in the balance sheet, primarily due to their short-term nature.

Offering costs associated with the Initial Public Offering

Offering costs consist of legal, accounting, underwriting and other costs incurred that were directly related to the Initial Public Offering and that were charged to shareholders’ equity upon the completion of the Initial Public Offering.

F-7

ARCLIGHT CLEAN TRANSITION CORP. II

NOTES TO FINANCIAL STATEMENT

Class A ordinary shares subject to possible redemption

The Company accounts for its Class A ordinary shares subject to possible redemption in accordance with the guidance in ASC Topic 480 “Distinguishing Liabilities from Equity.” Class A ordinary shares subject to mandatory redemption (if any) are classified as liability instruments and are measured at fair value. Conditionally redeemable Class A ordinary shares (including Class A ordinary shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, Class A ordinary shares are classified as shareholders’ equity. The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of uncertain future events. Accordingly, as of March 25, 2021, 29,777,340 Class A ordinary shares subject to possible redemption are presented as temporary equity, outside of the shareholders’ equity section of the Company’s balance sheet.

Income taxes

The Company complies with the accounting and reporting requirements of ASC Topic 740, “Income Taxes,” which requires an asset and liability approach to financial accounting and reporting for income taxes. Deferred income tax assets and liabilities are computed for differences between the financial statement and tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized.

ASC Topic 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities. The Company’s management determined that the Cayman Islands is the Company’s only major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. There were no unrecognized tax benefits and no amounts accrued for interest and penalties as of March 25, 2021. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position.

There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s financial statement. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months.

Recent Accounting Pronouncements

Management does not believe that any recently issued, but not yet effective, accounting pronouncements, if currently adopted, would have a material effect on the Company’s financial statement.

NOTE 3. INITIAL PUBLIC OFFERING

On March 25, 2021, the Company consummated its Initial Public Offering of 31,116,305 Units, including the partial exercise of the underwriters’ option to purchase 3,616,305 Over-Allotment Units, at $10.00 per Unit, generating gross proceeds of approximately $311.2 million, and incurring offering costs of approximately $17.6 million, of which approximately $10.9 million was for deferred underwriting commissions.

Each Unit consists of one Class A ordinary share and one-fifth of one redeemable warrant (“Public Warrant”). Each whole Public Warrant entitles the holder to purchase one Class A ordinary share at an exercise price of $11.50 per share, subject to adjustment (see Note 7).

F-8

ARCLIGHT CLEAN TRANSITION CORP. II

NOTES TO FINANCIAL STATEMENT

NOTE 4. PRIVATE PLACEMENT

Simultaneously with the closing of the Initial Public Offering, the Company consummated the Private Placement of 9,223,261 Private Placement Warrants, at a price of $1.00 per Private Placement Warrant with the Sponsor, generating gross proceeds of approximately $9.2 million.

Each whole Private Placement Warrant is exercisable for one whole share of Class A ordinary shares at a price of $11.50 per share. A portion of the proceeds from the sale of the Private Placement Warrants to the Sponsor was added to the proceeds from the Initial Public Offering held in the Trust Account. If the Company does not complete a Business Combination within the Combination Period, the Private Placement Warrants will expire worthless. The Private Placement Warrants will be non-redeemable for cash and exercisable on a cashless basis so long as they are held by the Sponsor or its permitted transferees.

The Sponsor and the Company’s officers and directors agreed, subject to limited exceptions, not to transfer, assign or sell any of their Private Placement Warrants until 30 days after the completion of the initial Business Combination.

NOTE 5. RELATED PARTY TRANSACTIONS

Founder Shares

On January 20, 2021, the Sponsor paid an aggregate of $25,000 for certain expenses on behalf of the Company in exchange for issuance of 7,187,500 Class B ordinary shares (the “Founder Shares”). On February 2, 2021, the Sponsor transferred 35,000 founder shares to each of Arno Harris, Ja-Chin Audrey Lee, Brian Goncher and Steven Berkenfeld, the Company’s independent directors. On March 22, 2021, the Company effected a share capitalization resulting in an aggregate of 7,906,250 Founder Shares issued and outstanding. The holders of the Founder Shares agreed to forfeit up to an aggregate of 1,031,250 Founder Shares, on a pro rata basis, to the extent that the option to purchase additional units is not exercised in full by the underwriters, so that the Founder Shares will represent 20% of the Company’s issued and outstanding shares after the Initial Public Offering. On March 25, 2021, the underwriters partially exercised the over-allotment option to purchase an additional 3,616,305 Units; thus, only 127,174 Class B ordinary shares remain subject to forfeiture.

The Initial Shareholders agreed not to transfer, assign or sell any of their Founder Shares until the earlier to occur of (A) one year after the completion of the initial Business Combination and (B) subsequent to the initial Business Combination, (x) if the closing price of Class A ordinary shares equals or exceeds $12.00 per share (as adjusted for share subdivisions, share capitalizations, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the initial Business Combination, or (y) the date on which the Company completes a liquidation, merger, share exchange or other similar transaction that results in all of the Public Shareholders having the right to exchange their ordinary shares for cash, securities or other property.

Related Party Loans

On January 20, 2021, the Sponsor agreed to loan the Company up to $300,000 pursuant to a promissory note (the “Note”). The Note was non-interest bearing, unsecured and due upon the closing of the Initial Public Offering. As of March 25, 2021, the Company borrowed approximately $172,000 under the Note. The Company fully repaid the Note on March 26, 2021 (see Note 8).

In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor, members of the Company’s founding team or any of their affiliates may, but are not obligated to, loan the Company funds as may be required (“Working Capital Loans”). If the Company completes a Business Combination, the Company would repay the Working Capital Loans out of the proceeds of the Trust Account released to the Company. Otherwise, the Working Capital Loans would be repaid only out of funds held outside the Trust Account. In the event that a Business Combination does not close, the Company may use a portion of proceeds held outside the Trust Account to repay the Working Capital Loans but no proceeds held in the Trust Account would be used to repay the Working Capital Loans. The Working Capital Loans would either be repaid upon consummation of a Business Combination, without interest, or, at the lender’s discretion, up to $1.5 million of such Working Capital Loans may be convertible into up to 1,500,000 private placement warrants of the post Business Combination entity at a price of $1.00 per warrant. The warrants

F-9

ARCLIGHT CLEAN TRANSITION CORP. II

NOTES TO FINANCIAL STATEMENT

would be identical to the Private Placement Warrants. Except for the foregoing, the terms of such Working Capital Loans, if any, have not been determined and no written agreements exist with respect to such loans. As of March 25, 2021, the Company had no borrowings under the Working Capital Loans.

Administrative Services Agreement

On March 25, 2021, the Company entered into an agreement that provided that, commencing on the date that the Company’s securities were first listed on Nasdaq through the earlier of consummation of the initial Business Combination and the liquidation, the Company agreed to pay the Sponsor $10,000 per month for office space, secretarial and administrative services provided to the Company.

In addition, the Sponsor, officers and directors, or their respective affiliates will be reimbursed for any out-of-pocket expenses incurred in connection with activities on the Company’s behalf such as identifying potential target businesses and performing due diligence on suitable Business Combinations. The Company’s audit committee will review on a quarterly basis all payments that were made by the Company to the Sponsor, executive officers or directors, or their affiliates. Any such payments prior to an initial Business Combination will be made using funds held outside the Trust Account.

NOTE 6. COMMITMENTS AND CONTINGENCIES

Registration and Shareholder Rights

The holders of the Founder Shares, Private Placement Warrants, and warrants that may be issued upon conversion of Working Capital Loans (and any Class A ordinary shares issuable upon the exercise of the Private Placement Warrants and warrants that may be issued upon conversion of Working Capital Loans) were entitled to registration rights pursuant to a registration and shareholder rights agreement signed upon the effective date of the Initial Public Offering. The holders of these securities were entitled to make up to three demands, excluding short form demands, that the Company registers such securities. In addition, the holders have certain “piggy-back” registration rights with respect to registration statements filed subsequent to the completion of the initial Business Combination. The Company will bear the expenses incurred in connection with the filing of any such registration statements.

Underwriting Agreement

The Company grant the underwriters a 45-day option from the date of this prospectus to purchase up to 4,125,000 additional Units at the Initial Public Offering price less the underwriting discounts and commissions. On March 25, 2021, the underwriters partially exercised the over-allotment option to purchase an additional 3,616,305 Units. The remaining unexercised over-allotment option will expire at the conclusion of the 45-day option period.

The underwriters were entitled to an underwriting discount of $0.20 per unit, or approximately $6.2 million in the aggregate, paid upon the closing of the Initial Public Offering. In addition, $0.35 per unit, or approximately $10.9 million in the aggregate will be payable to the underwriters for deferred underwriting commissions. The deferred fee will become payable to the underwriters from the amounts held in the Trust Account solely in the event that the Company completes a Business Combination, subject to the terms of the underwriting agreement.

NOTE 7. SHAREHOLDERS’ EQUITY

Preference Shares — The Company is authorized to issue 5,000,000 preference shares with a par value of $0.0001 per share. As of March 25, 2021, there were no preference shares issued or outstanding.

Class A Ordinary Shares — The Company is authorized to issue 500,000,000 Class A ordinary shares with a par value of $0.0001 per share. Holders of the Company’s Class A ordinary shares are entitled to one vote for each share. As of March 25, 2021, there were 1,338,965 Class A ordinary shares issued and outstanding, excluding 29,777,340 Class A ordinary shares subject to possible redemption.

Class B Ordinary Shares — The Company is authorized to issue 50,000,000 Class B ordinary shares with a par value of $0.0001 per share. On January 20, 2021, the Company issued 7,187,500 Class B ordinary shares. On March 22,

F-10

ARCLIGHT CLEAN TRANSITION CORP. II

NOTES TO FINANCIAL STATEMENT

2021, the Company effected a share capitalization resulting in an aggregate of 7,906,250 Class B ordinary shares issued and outstanding. Of the 7,906,250 Class B ordinary shares outstanding, up to 1,031,250 Class B ordinary shares are subject to forfeiture, to the Company by the Initial Shareholders for no consideration to the extent that the underwriters’ over-allotment option is not exercised in full or in part, so that the Initial Shareholders will collectively own 20% of the Company’s issued and outstanding ordinary shares after the Initial Public Offering. On March 25, 2021, the underwriters partially exercised the over-allotment option to purchase an additional 3,616,305 Units; thus, only 127,174 Class B ordinary shares remain subject to forfeiture.

Ordinary shareholders of record are entitled to one vote for each share held on all matters to be voted on by shareholders. Except as described below, holders of Class A ordinary shares and holders of Class B ordinary shares will vote together as a single class on all matters submitted to a vote of the shareholders except as required by law.

The Class B ordinary shares will automatically convert into Class A ordinary shares, which such Class A ordinary shares delivered upon conversion will not have any redemption rights or be entitled to liquidating distributions if the Company does not consummate an initial Business Combination, at the time of the initial Business Combination or earlier at the option of the holders thereof at a ratio such that the number of Class A ordinary shares issuable upon conversion of all Founder Shares will equal, in the aggregate, on an as-converted basis, 20% of the sum of (i) the total number of ordinary shares issued and outstanding upon completion of the Initial Public Offering, plus (ii) the total number of Class A ordinary shares issued or deemed issued or issuable upon conversion or exercise of any equity-linked securities or rights issued or deemed issued, by the Company in connection with or in relation to the consummation of the initial Business Combination, excluding any Class A ordinary shares or equity-linked securities exercisable for or convertible into Class A ordinary shares issued, deemed issued, or to be issued, to any seller in the initial Business Combination and any Private Placement Warrants issued to the Sponsor, its affiliates or any member of the management team upon conversion of Working Capital Loans. In no event will the Class B ordinary shares convert into Class A ordinary shares at a rate of less than one-to-one.

Warrants — Public Warrants may only be exercised for a whole number of shares. No fractional Public Warrants will be issued upon separation of the Units and only whole Public Warrants will trade. The Public Warrants will become exercisable 30 days after the completion of a Business Combination; provided that the Company has an effective registration statement under the Securities Act covering the Class A ordinary shares issuable upon exercise of the Public Warrants and a current prospectus relating to them is available and such shares are registered, qualified or exempt from registration under the securities, or blue sky, laws of the state of residence of the holder (or the Company permit holders to exercise their warrants on a cashless basis under certain circumstances). The Company agreed that as soon as practicable, but in no event later than 20 business days after the closing of the initial Business Combination, the Company will use commercially reasonable efforts to file with the SEC and have an effective registration statement covering the Class A ordinary shares issuable upon exercise of the warrants and to maintain a current prospectus relating to those Class A ordinary shares until the warrants expire or are redeemed, as specified in the warrant agreement. If a registration statement covering the Class A ordinary shares issuable upon exercise of the warrants is not effective by the 60th day after the closing of the initial Business Combination, warrant holders may, until such time as there is an effective registration statement and during any period when the Company will have failed to maintain an effective registration statement, exercise warrants on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act or another exemption. Notwithstanding the above, if the Class A ordinary shares are at the time of any exercise of a warrant not listed on a national securities exchange such that they satisfy the definition of a “covered security” under Section 18(b)(1) of the Securities Act, the Company may, at its option, require holders of Public Warrants who exercise their warrants to do so on a “cashless basis” and, in the event the Company so elects, the Company will not be required to file or maintain in effect a registration statement, and in the event the Company does not so elect, it will use commercially reasonable efforts to register or qualify the shares under applicable blue sky laws to the extent an exemption is not available.

The warrants have an exercise price of $11.50 per share, subject to adjustments, and will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation. In addition, if (x) the Company issues additional Class A ordinary shares or equity-linked securities for capital raising purposes in connection with the closing of the initial Business Combination at an issue price or effective issue price of less than $9.20 per ordinary share (with such issue price or effective issue price to be determined in good faith by the board of directors and, in the case of any such issuance to the Sponsor or its affiliates, without taking into account any Founder Shares held by the Sponsor or such affiliates, as applicable, prior to such issuance) (the “Newly Issued Price”), (y) the aggregate gross

F-11

ARCLIGHT CLEAN TRANSITION CORP. II

NOTES TO FINANCIAL STATEMENT

proceeds from such issuances represent more than 60% of the total equity proceeds, and interest thereon, available for the funding of the initial Business Combination on the date of the consummation of the initial Business Combination (net of redemptions), and (z) the volume weighted average trading price of the Class A ordinary shares during the 20 trading day period starting on the trading day prior to the day on which the Company consummates its initial Business Combination (such price, the “Market Value”) is below $9.20 per share, the exercise price of the warrants will be adjusted (to the nearest cent) to be equal to 115% of the higher of the Market Value and the Newly Issued Price, and the $18.00 per share redemption trigger price described under “Redemption of warrants when the price per Class A ordinary share equals or exceeds $18.00” will be adjusted (to the nearest cent) to be equal to 180% of the higher of the Market Value and the Newly Issued Price, and the $10.00 per share redemption trigger price described under the caption “Redemption of warrants when the price per Class A ordinary share equals or exceeds $10.00” will be adjusted (to the nearest cent) to be equal to the higher of the Market Value and the Newly Issued Price.

The Private Placement Warrants are identical to the Public Warrants underlying the Units sold in the Initial Public Offering, except that the Private Placement Warrants and the Class A ordinary shares issuable upon exercise of the Private Placement Warrants will not be transferable, assignable or salable until 30 days after the completion of a Business Combination, subject to certain limited exceptions. Additionally, the Private Placement Warrants will be non-redeemable so long as they are held by the initial purchasers or such purchasers’ permitted transferees. If the Private Placement Warrants are held by someone other than the Initial Shareholders or their permitted transferees, the Private Placement Warrants will be redeemable by the Company and exercisable by such holders on the same basis as the Public Warrants.

Redemption of warrants when the price per Class A ordinary share equals or exceeds $18.00: Once the warrants become exercisable, the Company may redeem the outstanding warrants (except as described herein with respect to the Private Placement Warrants):

The Company will not redeem the warrants as described above unless a registration statement under the Securities Act covering the Class A ordinary shares issuable upon exercise of the warrants is then effective and a current prospectus relating to those Class A ordinary shares is available throughout the 30-day redemption period.

Redemption of warrants when the price per Class A ordinary share equals or exceeds $10.00: Once the warrants become exercisable, the Company may redeem the outstanding warrants:

F-12

ARCLIGHT CLEAN TRANSITION CORP. II

NOTES TO FINANCIAL STATEMENT

The “fair market value” of Class A ordinary shares for the above purpose shall mean the volume weighted average price of Class A ordinary shares during the 10 trading days immediately following the date on which the notice of redemption is sent to the holders of warrants. In no event will the warrants be exercisable in connection with this redemption feature for more than 0.361 Class A ordinary shares per warrant (subject to adjustment).

In no event will the Company be required to net cash settle any warrant. If the Company is unable to complete a Business Combination within the Combination Period and the Company liquidates the funds held in the Trust Account, holders of warrants will not receive any of such funds with respect to their warrants, nor will they receive any distribution from the Company’s assets held outside of the Trust Account with the respect to such warrants. Accordingly, the warrants may expire worthless.

NOTE 8. SUBSEQUENT EVENTS

The Company fully repaid the Note amount of approximately $172,000 on March 26, 2021.

The Company evaluated subsequent events and transactions that occurred after the balance sheet date up to the date that the financial statement was issued. Based upon this review, the Company did not identify any subsequent events that would have required adjustment or disclosure in the financial statement, except as noted above.

F-13