United States securities and exchange commission logo





                            July 12, 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. 5 to
Registration Statement on Form S-1
                                                            Filed June 29, 2021
                                                            File No. 333-253586

       Dear Mr. Cubbage:

              We have reviewed your amended registration statement and have the
following
       comment. In our comment, 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 comment applies 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 this comment, we may have additional comments.

       Amendment No. 5 to Registration Statement on Form S-1 filed June 29,
2021

       General

   1.                                                   We note the added
disclosure regarding the anchor investors. Please revise the cover page
                                                        and the defined term in
the Summary on page 1 to acknowledge that if the anchor
                                                        investors purchase the
allocated amount of units, your sponsor will sell the anchor
                                                        investors an aggregate
of 1,650,000 founder shares at their original purchase price of
                                                        $0.003 per share. In
appropriate places, please also discuss the dilutive impact that the
                                                        issuance of additional
founder shares to the anchor investors would have on investors in
                                                        this offering.
Additionally, we note that your anchor investors are not affiliated with
                                                        management. Please
revise to disclose whether any of the anchor investors are affiliated
                                                        with you, your sponsor,
or your directors, as well as any related conflicts or associated
                                                        risks.
 Vincent T. Cubbage
TortoiseEcofin Acquisition Corp. III
July 12, 2021
Page 2

       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
July 12, 2021 Page 2
cc:       Brenda Lenahan
FirstName LastName