United States securities and exchange commission logo





                               June 17, 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. 6 to
Registration Statement on Form S-4
                                                            Filed June 14, 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.

       Amendment No. 6 to Registration Statement on Form S-4

       General

   1.                                                   We note your response
to prior comment 1, and your revised disclosure regarding
                                                        indemnification
obligations of ArcLight and OPAL Fuels under the engagement letters.
                                                        Please also provide
such disclosure as it specifically relates to the Citi financial advisor
                                                        letter agreement. In
that regard, we note you discuss the indemnification obligations set
                                                        forth in the PIPE
Investment engagement letter, but it does not appear that you have
                                                        specifically discussed
the indemnification obligations set forth in the Citi financial advisor
                                                        letter agreement.
   2.                                                   To provide context for
your discussion of the indemnification provisions set forth in the
                                                        underwriting agreement
and engagement letters that will survive termination of the
                                                        engagement, please also
discuss any contribution provisions under such agreements that
 John F. Erhard
ArcLight Clean Transition Corp. II
June 17, 2022
Page 2
      will survive termination of the engagement, and whether, and if so how,
they are impacted
      by the waiver of fees by the underwriters and financial advisors. In the
alternative, please
      tell us why you believe such information is not material.
3.    With a view toward disclosure, please tell us whether your sponsor is, is
controlled by, or
      has substantial ties with a non-U.S. person. Please also tell us whether
anyone or any
      entity associated with or otherwise involved in the transaction, is, is
controlled by, or has
      substantial ties with a non-U.S. person. If so, also include risk factor
disclosure that
      addresses how this fact could impact your ability to complete your
initial business
      combination. For instance, discuss the risk to investors that you may not
be able to
      complete an initial business combination with a U.S. target company
should the
      transaction be subject to review by a U.S. government entity, such as the
Committee on
      Foreign Investment in the United States (CFIUS), or ultimately
prohibited. Further,
      disclose that the time necessary for government review of the transaction
or a decision to
      prohibit the transaction could prevent you from completing an initial
business
      combination and require you to liquidate. Disclose the consequences of
liquidation to
      investors, such as the losses of the investment opportunity in a target
company, any price
      appreciation in the combined company, and the warrants, which would
expire worthless.
       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 17, 2022 Page 2
cc:       Julian Seiguer
FirstName LastName