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                              May 17, 2021

       Vincent T. Cubbage
       Chief Executive Officer
       TortoiseEcofin Acquisition Corp. III
       5100 W. 115th Place
       Leawood, KS 66211

                                                        Re: TortoiseEcofin
Acquisition Corp. III
                                                            Amendment No. 3 to
Registration Statement on Form S-1
                                                            Filed May 4, 2021
                                                            File No. 333-253586

       Dear Mr. Cubbage:

             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. 3 to Registration Statement on Form S-1

       Exhibits
       Exhibit 4.4, page II-2

   1.                                                   Your Risk Factors and
Description of Securities sections state that the exclusive forum
                                                        provision of the
warrant agreement identifies the courts of the State of New York or the
                                                        United States District
Court for the Southern District of New York as the exclusive forum
                                                        for claims under the
Securities Act and that the exclusive forum provision will not apply
                                                        to claims under the
Exchange Act. However, Section 9.3 of the warrant agreement does
                                                        not discuss the
provision's applicability to the Securities Act or Exchange Act. Please
                                                        revise Section 9.3 of
the warrant agreement to state that it applies to claims under the
                                                        Securities Act, but not
to claims under the Exchange Act or, if you determine not to revise
                                                        the warrant agreement,
tell us how you will inform investors in future filings of this fact.
 Vincent T. Cubbage
TortoiseEcofin Acquisition Corp. III
May 17, 2021
Page 2
Exhibit 5.2

2.    It is inappropriate to assume the legal authority of, authorization by,
or due execution by
      the Company and its representatives; please delete or revise assumptions
1, 4, 8 and 9
      accordingly. It is also inappropriate to assume facts that are readily
ascertainable; please
      delete or revise assumptions 2 and 3 accordingly.
       Please contact Cara Wirth at (202) 551-7127 or Lilyanna Peyser at (202)
551-3222 with
any questions.



                                                             Sincerely,
FirstName LastNameVincent T. Cubbage
                                                             Division of
Corporation Finance
Comapany NameTortoiseEcofin Acquisition Corp. III
                                                             Office of Trade &
Services
May 17, 2021 Page 2
cc:       Brenda Lenahan
FirstName LastName