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                             June 13, 2022

       John F. Erhard
       Chief Executive Officer
       ArcLight Clean Transition Corp. II
       200 Clarendon Street, 55th Floor
       Boston, Massachusetts 02116

                                                        Re: ArcLight Clean
Transition Corp. II
                                                            Amendment No. 5 to
Registration Statement on Form S-4
                                                            Filed May 31, 2022
                                                            File No. 333-262583

       Dear Mr. Erhard:

             We have reviewed your amended registration statement and have the
following
       comments. In some of our comments, we may ask you to provide us with
information so we
       may better understand your disclosure.

              Please respond to this letter by amending your registration
statement and providing the
       requested information. If you do not believe our comments apply to your
facts and
       circumstances or do not believe an amendment is appropriate, please tell
us why in your
       response.

              After reviewing any amendment to your registration statement and
the information you
       provide in response to these comments, we may have additional comments.
Unless we note
       otherwise, our references to prior comments are to comments in our May
23, 2022 letter.

       Amendment No. 5 to Registration Statement on Form S-4

       General

   1.                                                   We note your response
to prior comment 11, and your disclosure that ArcLight continues
                                                        to have customary
obligations with respect to use of information and indemnification
                                                        under the placement
agreement agreements with the Advisors, the financial advisory
                                                        agreement with
Citigroup Global Markets Inc. and the Underwriting Agreement with
                                                        Barclays Capital Inc.
and Citi, and OPAL Fuels continues to have customary obligations
                                                        with respect to use of
information and indemnification pursuant to the financial advisory
                                                        agreements with BofA
Securities, Inc. and Credit Suisse Securities (USA) LLC. Please
                                                        disclose all material
terms of such indemnification provisions, and discuss the impacts of
                                                        those obligations on
ArcLight and OPAL Fuels in the registration statement.
 John F. Erhard
ArcLight Clean Transition Corp. II
June 13, 2022
Page 2

       You may contact Mark Wojciechowski at (202) 551-3759 or John Cannarella
at (202)
551- 3337 if you have questions regarding comments on the financial statements
and related
matters. Please contact Kevin Dougherty at (202) 551-3271 or Laura Nicholson,
Special
Counsel, at (202) 551-3584 with any other questions.



                                                          Sincerely,
FirstName LastNameJohn F. Erhard
                                                          Division of
Corporation Finance
Comapany NameArcLight Clean Transition Corp. II
                                                          Office of Energy &
Transportation
June 13, 2022 Page 2
cc:       Julian Seiguer
FirstName LastName