Document:

Exhibit 10.3

 

INVESTMENT MANAGEMENT TRUST AGREEMENT

 

This Investment Management
Trust Agreement (this “Agreement”) is made effective as of [●], 2021 by and between TortoiseEcofin
Acquisition Corp. III, a Cayman Islands exempted company (the “Company”), and Continental Stock Transfer
& Trust Company, a New York corporation (the “Trustee”).

 

WHEREAS, the Company’s
registration statement on Form S-1, No. 333-[______] (the “Registration Statement”) and prospectus (the
“Prospectus”) for the initial public offering of the Company’s Class A ordinary shares, par value
$0.0001 per share (the “Ordinary Shares”) (such initial public offering hereinafter referred to as the
“Offering”), has been declared effective as of the date hereof by the U.S. Securities and Exchange Commission;

 

WHEREAS, the Company
has entered into an Underwriting Agreement (the “Underwriting Agreement”) with Barclays Capital Inc.
and Goldman Sachs & Co. LLC as representatives (the “Representatives”) of the several underwriters
(the “Underwriters”) named therein;

 

WHEREAS, as described
in the Registration Statement, $300,000,000 of the gross proceeds of the Offering and sale of the Private Placement Shares (as
defined in the Underwriting Agreement) (or $345,000,000 if the Underwriters’ over-allotment option is exercised in full)
will be delivered to the Trustee to be deposited and held in a segregated trust account located at all times in the United States
(the “Trust Account”) for the benefit of the Company and the holders of the Ordinary Shares issued in
the Offering as hereinafter provided (the amount to be delivered to the Trustee (and any interest subsequently earned thereon)
is referred to herein as the “Property,” the shareholders for whose benefit the Trustee shall hold the
Property will be referred to as the “Public Shareholders,” and the Public Shareholders and the Company
will be referred to together as the “Beneficiaries”);

 

WHEREAS, pursuant to
the Underwriting Agreement, a portion of the Property equal to $10,500,000, or $12,075,000 if the Underwriters’ over-allotment
option is exercised in full, is attributable to deferred underwriting discounts and commissions that may be payable by the Company
to the Underwriters upon the consummation of the Business Combination (as defined below) (the “Deferred Discount”);
and

 

WHEREAS, the Company
and the Trustee desire to enter into this Agreement to set forth the terms and conditions pursuant to which the Trustee shall hold
the Property.

 

NOW THEREFORE, IT IS
AGREED:

 

1. Agreements
and Covenants of Trustee. The Trustee hereby agrees and covenants to:

 

(a) Hold
the Property in trust for the Beneficiaries in accordance with the terms of this Agreement in the Trust Account established by
the Trustee in the United States at J.P. Morgan Chase Bank, N.A. (or at another U.S. chartered commercial bank with consolidated
assets of $100 billion or more and at a brokerage institution selected by the Trustee that is reasonably satisfactory to the Company);

 

(b) Manage,
supervise and administer the Trust Account subject to the terms and conditions set forth herein;

 

(c) In
a timely manner, upon the written instruction of the Company, invest and reinvest the Property in United States government securities
within the meaning of Section 2(a)(16) of the Investment Company Act of 1940, as amended (the “Investment Company Act”),
having a maturity of 185 days or less, or in money market funds meeting the conditions of paragraphs (d)(1), (d)(2), (d)(3) and
(d)(4) of Rule 2a-7 promulgated under the Investment Company Act, which invest only in direct U.S. government treasury obligations,
as determined by the Company; the Trustee may not invest in any other securities or assets, it being understood that the Trust
Account will earn no interest while account funds are uninvested awaiting the Company’s instructions hereunder and the Trustee
may earn bank credits and other consideration;

 

(d) Collect
and receive, when due, all interest or other income arising from the Property, which shall become part of the “Property,”
as such term is used herein;

 

     

     

    

 

(e) Promptly
notify the Company and the Representatives of all communications received by the Trustee with respect to any Property requiring
action by the Company;

 

(f) Supply
any necessary information or documents as may be requested by the Company (or its authorized agents) in connection with the Company’s
preparation of the tax returns relating to assets held in the Trust Account;

 

(g) Participate
in any plan or proceeding for protecting or enforcing any right or interest arising from the Property if, as and when instructed
by the Company to do so;

 

(h) Render
to the Company monthly written statements of the activities of, and amounts in, the Trust Account reflecting all receipts and disbursements
of the Trust Account;

 

(i) Commence
liquidation of the Trust Account only after and promptly after (x) receipt of, and only in accordance with, the terms of a letter
from the Company (“Termination Letter”) in a form substantially similar to that attached hereto as either
Exhibit A or Exhibit B, as applicable, signed on behalf of the Company by its Chief Executive Officer, President,
Chief Financial Officer, Secretary or Chairman of the board of directors of the Company (the “Board”)
or other authorized officer of the Company, and complete the liquidation of the Trust Account and distribute the Property in the
Trust Account, including interest not previously released to the Company to pay its income taxes (less up to $100,000 of interest
that may be released to the Company to pay dissolution expenses), only as directed in the Termination Letter and the other documents
referred to therein, or (y) upon the date which is the later of (1) 24 months after the closing of the Offering, or 27 months from
the closing of the Offering if the Company has executed a letter of intent, agreement in principal or definitive agreement for
a Business Combination within 24 months from the closing of the Offering but has not completed the Business Combination within
such 24-month period, and (2) such later date as may be approved by the Company’s shareholders in accordance with the Company’s
amended and restated memorandum and articles of association, as may be amended from time to time (the “Memorandum and
Articles”), if a Termination Letter has not been received by the Trustee prior to such date, in which case the Trust
Account shall be liquidated in accordance with the procedures set forth in the Termination Letter attached as Exhibit B
and the Property in the Trust Account, including interest not previously released to the Company to pay its income taxes (less
up to $100,000 of interest that may be released to the Company to pay dissolution expenses) shall be distributed to the Public
Shareholders of record as of such date;

 

(j) Upon
written request from the Company, which may be given from time to time in a form substantially similar to that attached hereto
as Exhibit C (a “Tax Payment Withdrawal Instruction”), withdraw from the Trust Account and distribute
to the Company the amount of interest earned on the Property requested by the Company to cover any income tax obligation owed by
the Company as a result of assets of the Company or interest or other income earned on the Property, which amount shall be delivered
directly to the Company by electronic funds transfer or other method of prompt payment, and the Company shall forward such payment
to the relevant taxing authority; provided, however, that to the extent there is not sufficient cash in the Trust
Account to pay such tax obligation, the Trustee shall liquidate such assets held in the Trust Account as shall be designated by
the Company in writing to make such distribution. The written request of the Company referenced above shall constitute presumptive
evidence that the Company is entitled to said funds, and the Trustee shall have no responsibility to look beyond said request;

 

(k) Upon
written request from the Company, which may be given from time to time in a form substantially similar to that attached hereto
as Exhibit D (a “Shareholder Redemption Withdrawal Instruction”), the Trustee shall distribute
on behalf of the Company the amount requested by the Company to be used to redeem Ordinary Shares from Public Shareholders properly
submitted in connection with a shareholder vote to approve an amendment to the Memorandum and Articles that would affect the substance
or timing of the Company’s obligation to redeem one hundred percent (100%) of its public Ordinary Shares if the Company has
not consummated an initial Business Combination within such time as is described in the Memorandum and Articles. The written request
of the Company referenced above shall constitute presumptive evidence that the Company is entitled to distribute said funds, and
the Trustee shall have no responsibility to look beyond said request; and

 

(l) Not
make any withdrawals or distributions from the Trust Account other than pursuant to Section 1(i), 1(j) or 1(k)
above.

 

    2

     

    

 

2. Agreements
and Covenants of the Company. The Company hereby agrees and covenants to:

 

(a) Give
all instructions to the Trustee hereunder in writing, signed by the Company’s Chairperson of the Board, President, Chief
Executive Officer, Chief Financial Officer or Secretary. In addition, except with respect to its duties under Sections 1(i),
1(j) or 1(k) hereof, the Trustee shall be entitled to rely on, and shall be protected in relying on, any verbal or
telephonic advice or instruction which it, in good faith and with reasonable care, believes to be given by any one of the persons
authorized above to give written instructions, provided that the Company shall promptly confirm such instructions in writing;

 

(b) Subject
to Section 4 hereof, hold the Trustee harmless and indemnify the Trustee from and against any and all expenses, including
reasonable counsel fees and disbursements, or losses suffered by the Trustee in connection with any action taken by it hereunder
and in connection with any action, suit or other proceeding brought against the Trustee involving any claim, or in connection with
any claim or demand, which in any way arises out of or relates to this Agreement, the services of the Trustee hereunder, or the
Property or any interest earned on the Property, except for expenses and losses resulting from the Trustee’s gross negligence,
fraud or willful misconduct. Promptly after the receipt by the Trustee of notice of demand or claim or the commencement of any
action, suit or proceeding, pursuant to which the Trustee intends to seek indemnification under this Section 2(b),
it shall notify the Company in writing of such claim (hereinafter referred to as the “Indemnified Claim”).
The Trustee shall have the right to conduct and manage the defense against such Indemnified Claim; provided that the Trustee
shall obtain the consent of the Company with respect to the selection of counsel, which consent shall not be unreasonably withheld.
The Trustee may not agree to settle any Indemnified Claim without the prior written consent of the Company, which such consent
shall not be unreasonably withheld. The Company may participate in such action with its own counsel;

 

(c) Pay
the Trustee the fees set forth on Schedule A hereto, including an initial acceptance fee, annual administration fee and
transaction processing fee which fees shall be subject to modification by the parties from time to time. It is expressly understood
that the Property shall not be used to pay such fees unless and until it is distributed to the Company pursuant to Sections 1(i)
through 1(k) hereof. The Company shall pay the Trustee the initial acceptance fee and the first annual administration fee
at the consummation of the Offering. The Trustee shall refund to the Company the annual administration fee (on a pro rata basis)
with respect to any period after the liquidation of the Trust Account. The Company shall not be responsible for any other fees
or charges of the Trustee except as set forth in this Section 2(c), Schedule A and as may be provided in Section 2(b)
hereof;

 

(d) In
connection with any vote of the Company’s shareholders regarding a merger, amalgamation, share exchange, asset acquisition,
share purchase, reorganization or similar business combination involving the Company and one or more businesses or entities (the
“Business Combination”), provide to the Trustee an affidavit or certificate of the inspector of elections
for the general meeting verifying the vote of such shareholders regarding such Business Combination;

 

(e) Provide
the Representatives with a copy of any Termination Letter(s) and/or any other correspondence that is sent to the Trustee with respect
to any proposed withdrawal from the Trust Account promptly after it issues the same;

 

(f) Instruct
the Trustee to make only those distributions that are permitted under this Agreement, and refrain from instructing the Trustee
to make any distributions that are not permitted under this Agreement; and

 

(g) Within
four (4) business days after the Underwriters exercise the over-allotment option (or any unexercised portion thereof) or such over-allotment
option expires, provide the Trustee with a notice in writing of the total amount of the Deferred Discount, which shall in no event
be less than $10,500,000.

 

    3

     

    

 

3. Limitations
of Liability. The Trustee shall have no responsibility or liability to:

 

(a) Imply
obligations, perform duties, inquire or otherwise be subject to the provisions of any agreement or document other than this Agreement
and that which is expressly set forth herein;

 

(b) Take
any action with respect to the Property, other than as directed in Section 1 hereof, and the Trustee shall have no
liability to any party except for liability arising out of the Trustee’s gross negligence, fraud or willful misconduct;

 

(c) Institute
any proceeding for the collection of any principal and income arising from, or institute, appear in or defend any proceeding of
any kind with respect to, any of the Property unless and until it shall have received instructions from the Company given as provided
herein to do so and the Company shall have advanced or guaranteed to it funds sufficient to pay any expenses incident thereto;

 

(d) Refund
any depreciation in principal of any Property;

 

(e) Assume
that the authority of any person designated by the Company to give instructions hereunder shall not be continuing unless provided
otherwise in such designation, or unless the Company shall have delivered a written revocation of such authority to the Trustee;

 

(f) The
other parties hereto or to anyone else for any action taken or omitted by it, or any action suffered by it to be taken or omitted,
in good faith and in the Trustee’s best judgment, except for the Trustee’s gross negligence, fraud or willful misconduct.
The Trustee may rely conclusively and shall be protected in acting upon any order, notice, demand, certificate, opinion or advice
of counsel (including counsel chosen by the Trustee, which counsel may be the Company’s counsel), statement, instrument,
report or other paper or document (not only as to its due execution and the validity and effectiveness of its provisions, but also
as to the truth and acceptability of any information therein contained) which the Trustee believes, in good faith and with reasonable
care, to be genuine and to be signed or presented by the proper person or persons. The Trustee shall not be bound by any notice
or demand, or any waiver, modification, termination or rescission of this Agreement or any of the terms hereof, unless evidenced
by a written instrument delivered to the Trustee, signed by the proper party or parties and, if the duties or rights of the Trustee
are affected, unless it shall give its prior written consent thereto;

 

(g) Verify
the accuracy of the information contained in the Registration Statement;

 

(h) Provide
any assurance that any Business Combination entered into by the Company or any other action taken by the Company is as contemplated
by the Registration Statement;

 

(i) File
information returns with respect to the Trust Account with any local, state or federal taxing authority or provide periodic written
statements to the Company documenting the taxes payable by the Company, if any, relating to any interest income earned on the Property;

 

(j) Prepare,
execute and file tax reports, income or other tax returns and pay any taxes with respect to any income generated by, and activities
relating to, the Trust Account, regardless of whether such tax is payable by the Trust Account or the Company, including, but not
limited to, income tax obligations, except pursuant to Section 1(j) hereof; or

 

(k) Verify
calculations, qualify or otherwise approve the Company’s written requests for distributions pursuant to Sections 1(i),
1(j) or 1(k) hereof.

 

4. Trust
Account Waiver. The Trustee has no right of set-off or any right, title, interest or claim of any kind (“Claim”)
to, or to any monies in, the Trust Account, and hereby irrevocably waives any Claim to, or to any monies in, the Trust Account
that it may have now or in the future. In the event the Trustee has any Claim against the Company under this Agreement, including,
without limitation, under Section 2(b) or Section 2(c) hereof, the Trustee shall pursue such Claim solely
against the Company and its assets outside the Trust Account and not against the Property or any monies in the Trust Account.

 

    4

     

    

 

5. Termination.
This Agreement shall terminate as follows:

 

(a) If the Trustee
gives written notice to the Company that it desires to resign under this Agreement, the Company shall use its reasonable
efforts to locate a successor trustee, pending which the Trustee shall continue to act in accordance with this Agreement. At
such time that the Company notifies the Trustee that a successor trustee has been appointed and has agreed to become subject
to the terms of this Agreement, the Trustee shall transfer the management of the Trust Account to the successor trustee,
including but not limited to the transfer of copies of the reports and statements relating to the Trust Account, whereupon
this Agreement shall terminate; provided, however, that in the event that the Company does not locate a
successor trustee within ninety (90) days of receipt of the resignation notice from the Trustee, the Trustee may submit an
application to have the Property deposited with any court in the State of New York or with the United States District Court
for the Southern District of New York and upon such deposit, the Trustee shall be immune from any liability whatsoever;
or

 

(b) At
such time that the Trustee has completed the liquidation of the Trust Account and its obligations in accordance with the provisions
of Section 1(i) hereof (which section may not be amended under any circumstances) and distributed the Property in accordance
with the provisions of the Termination Letter, this Agreement shall terminate except with respect to Section 2(b).

 

6. Miscellaneous.

 

(a) The
Company and the Trustee each acknowledge that the Trustee will follow the security procedures set forth below with respect to funds
transferred from the Trust Account. The Company and the Trustee will each restrict access to confidential information relating
to such security procedures to authorized persons. Each party must notify the other party immediately if it has reason to believe
unauthorized persons may have obtained access to such confidential information, or of any change in its authorized personnel. In
executing funds transfers, the Trustee shall rely upon all information supplied to it by the Company, including, account names,
account numbers and all other identifying information relating to a Beneficiary, Beneficiary’s bank or intermediary bank.
Except for any liability arising out of the Trustee’s gross negligence, fraud or willful misconduct, the Trustee shall not
be liable for any loss, liability or expense resulting from any error in the information or transmission of the funds.

 

(b) This
Agreement shall be governed by and construed and enforced in accordance with the laws of the State of New York, without giving
effect to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction. This
Agreement may be executed in several original or facsimile counterparts, each one of which shall constitute an original, and together
shall constitute but one instrument.

 

(c) This
Agreement contains the entire agreement and understanding of the parties hereto with respect to the subject matter hereof. Except
for Sections 1(i), 1(j) or 1(k) hereof (which sections may not be modified, amended or deleted without
the affirmative vote of sixty-five percent (65%) of the then outstanding Ordinary Shares and Class B ordinary shares, par value
$0.0001 per share, of the Company, voting together as a single class; provided that no such amendment will affect any Public
Shareholder who has properly elected to redeem his, her or its Ordinary Shares in connection with a shareholder vote to approve
an amendment to this Agreement that would affect the substance or timing of the Company’s obligation to redeem one hundred
percent (100%) of its public Ordinary Shares if the Company does not complete its initial Business Combination within the time
frame specified in the Memorandum and Articles), this Agreement or any provision hereof may only be changed, amended or modified
(other than to correct a typographical error) by a writing signed by each of the parties hereto.

 

(d) The
parties hereto consent to the jurisdiction and venue of any state or federal court located in the City of New York, State of New
York, for purposes of resolving any disputes hereunder. AS TO ANY CLAIM, CROSS-CLAIM OR COUNTERCLAIM IN ANY WAY RELATING TO THIS
AGREEMENT, EACH PARTY WAIVES THE RIGHT TO TRIAL BY JURY.

 

    5

     

    

 

(e) Any
notice, consent or request to be given in connection with any of the terms or provisions of this Agreement shall be in writing
and shall be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery
or by facsimile or email transmission:

 

if to the Trustee, to:

 

Continental Stock Transfer &
Trust Company

1 State Street, 30th Floor

New York, New York 10004

Attn: Francis Wolf and Celeste Gonzalez

Email: fwolf@continentalstock.com

Email: cgonzalez@continentalstock.com

 

if to the Company, to:

 

TortoiseEcofin Acquisition Corp.
III

5100 W. 115th Place

Leawood, KS 66211

Attn: Steven Schnitzer

 

in each case, with copies to:

 

Vinson & Elkins L.L.P.

1114 Avenue of the Americas, 32nd Floor

New York, NY 10036

Attn: Brenda Lenahan

Fax No.: (212) 237-0100

 

and

 

Barclays Capital Inc. and Goldman Sachs
& Co. LLC

 

Barclays Capital Inc.

745 Seventh Avenue

New York, New York 10019

Attn: General Counsel

Fax No.: (212) 412-7300

 

Goldman Sachs & Co. LLC

200 West Street

New York, New York 10282

Attn: General Counsel

Fax No.:

 

    6

     

    

 

and

 

Skadden, Arps, Slate, Meagher &
Flom LLP

525 University Avenue, Suite 1400

Palo Alto, California 94301

Attn: Gregg A. Noel and Michael J. Mies

Fax No.: (650) 470-4570

 

(f) Each
of the Company and the Trustee hereby represents that it has the full right and power and has been duly authorized to enter into
this Agreement and to perform its respective obligations as contemplated hereunder. The Trustee acknowledges and agrees that it
shall not make any claims or proceed against the Trust Account, including by way of set-off, and shall not be entitled to any funds
in the Trust Account under any circumstance.

 

(g) Each
of the Company and the Trustee hereby acknowledges and agrees that each of the Representatives, on behalf of the Underwriters,
is a third party beneficiary of this Agreement.

 

(h) Except
as specified herein, no party to this Agreement may assign its rights or delegate its obligations hereunder to any other person
or entity.

 

[Signature Page Follows]

 

    7

     

    

 

IN WITNESS WHEREOF,
the parties have duly executed this Investment Management Trust Agreement as of the date first written above.

 

	 	Continental Stock Transfer & Trust Company, as Trustee

 

	 	By:	 
	 	Name: 	Francis Wolf
	 	Title: 	Vice President

 

	 	TortoiseEcofin Acquisition Corp. III

 

	 	By:	 
	 	Name: 	Vincent T. Cubbage
	 	Title: 	Chief Executive Officer

 

[Signature Page to Investment Management
Trust Agreement]

 

     

     

    

 

SCHEDULE A

 

	Fee Item	 	Time and method of payment	 	Amount	 
	Initial set-up fee	 	Initial closing of Offering by wire transfer.	 	$	3,500.00	 
	Trustee administration fee	 	Payable annually. First year fee payable at initial closing of Offering by wire transfer; thereafter, payable by wire transfer or check.	 	$	10,000.00	 
	Transaction processing fee for disbursements to Company under Sections 1(i), 1(j) and 1(k)	 	Billed to Company following disbursement made to Company under Section 1.	 	$	250.00	 
	Paying Agent services as required pursuant to Section 1(i) and 1(k)	 	Billed to Company upon delivery of service pursuant to Section 1(i) and 1(k).	 	 	Prevailing rates	 

 

    Schedule A

     

    

 

Exhibit A

 

[Letterhead of Company]

 

[Insert date]

 

Continental Stock Transfer & Trust
Company

1 State Street, 30th Floor

New York, New York 10004

Attn: Francis Wolf and Celeste Gonzalez

 

		Re:	Trust Account - Termination Letter

 

Ladies and Gentlemen:

 

Pursuant to Section 1(i)
of the Investment Management Trust Agreement between TortoiseEcofin Acquisition Corp. III (the “Company”)
and Continental Stock Transfer & Trust Company (the “Trustee”), dated as of [●], 2021 (the
“Trust Agreement”), this is to advise you that the Company has entered into an agreement with        
(the “Target Business”) to consummate a business combination with Target Business (the “Business
Combination”) on or about [   ],
20[     ]. The Company shall notify you at least seventy-two (72) hours in advance of the actual date
of the consummation of the Business Combination (the “Consummation Date”). Capitalized terms used but
not defined herein shall have the meanings set forth in the Trust Agreement.

 

In accordance with
the terms of the Trust Agreement, we hereby authorize you to commence to liquidate all of the assets of the Trust Account and to
transfer the proceeds into the trust operating account in the United States at J.P. Morgan Chase Bank, N.A. to the effect that,
on the Consummation Date, all of the funds held in the Trust Account will be immediately available for transfer to the account
or accounts that the Company shall direct on the Consummation Date. It is acknowledged and agreed that while the funds are on deposit
in the trust operating account at J.P. Morgan Chase Bank, N.A. awaiting distribution, the Company will not earn any interest or
dividends.

 

On the Consummation
Date (i) counsel for the Company shall deliver to you written notification that the Business Combination has been consummated,
or will be consummated concurrently with your transfer of funds to the accounts as directed by the Company (the “Notification”),
(ii) the Company shall deliver to you (a) a certificate of the Chief Executive Officer of the Company, which verifies that the
Business Combination has been approved by a vote of the Company’s shareholders, if a vote is held and (b) written instruction
signed by the Company with respect to the transfer of the funds held in the Trust Account, including payment of the Deferred Discount
from the Trust Account (the “Instruction Letter”) and (iii) Barclays Capital Inc. and Goldman Sachs &
Co. LLC shall deliver to you joint written instructions for delivery of the Deferred Discount. You are hereby directed and authorized
to transfer the funds held in the Trust Account immediately upon your receipt of the Notification and the Instruction Letter, in
accordance with the terms of the Instruction Letter. In the event that certain deposits held in the Trust Account may not be liquidated
by the Consummation Date without penalty, you will notify the Company in writing of the same and the Company shall direct you as
to whether such funds should remain in the Trust Account and be distributed after the Consummation Date to the Company. Upon the
distribution of all the funds, net of any payments necessary for reasonable unreimbursed expenses related to liquidating the Trust
Account, your obligations under the Trust Agreement shall be terminated.

 

    Exhibit A-1

     

    

 

In the event that the
Business Combination is not consummated on the Consummation Date described in the notice thereof and we have not notified you on
or before the original Consummation Date of a new Consummation Date, then upon receipt by the Trustee of written instructions from
the Company, the funds held in the Trust Account shall be reinvested as provided in Section 1(c) of the Trust Agreement
on the business day immediately following the Consummation Date as set forth in such written instructions as soon thereafter as
possible.

 

	 	Very truly yours,
	 	 
	 	TortoiseEcofin
    Acquisition Corp. III

 

	 	By:	 
	 	Name: 	 
	 	Title: 	 

 

		cc:	Barclays Capital Inc. and Goldman Sachs & Co. LLC

 

    Exhibit A-2

     

    

 

Exhibit B

 

[Letterhead of Company]

 

[Insert date]

 

Continental Stock Transfer & Trust
Company

1 State Street, 30th Floor

New York, New York 10004

Attn: Francis Wolf and Celeste Gonzalez

 

		Re:	Trust Account - Termination Letter

 

Dear Mr. Wolf and Ms. Gonzalez:

 

Pursuant to Section 1(i)
of the Investment Management Trust Agreement between TortoiseEcofin Acquisition Corp. III (the “Company”)
and Continental Stock Transfer & Trust Company (the “Trustee”), dated as of [●], 2021 (the
“Trust Agreement”), this is to advise you that the Company has been unable to effect a business combination
with a Target Business within the time frame specified in the Company’s amended and restated memorandum and articles of association
(the “Memorandum and Articles”), as described in the Company’s Prospectus relating to the Offering.
Capitalized terms used but not defined herein shall have the meanings set forth in the Trust Agreement.

 

In accordance with
the terms of the Trust Agreement, we hereby authorize you to liquidate all of the assets in the Trust Account and to transfer the
total proceeds into the trust operating account in the United States at J.P. Morgan Chase Bank, N.A. to await distribution to the
Public Shareholders. The Company has selected        , 20      
as the effective date for the purpose of determining when the Public Shareholders will be entitled to receive their share of the
liquidation proceeds. You agree to be the Paying Agent of record and, in your separate capacity as Paying Agent, agree to distribute
said funds directly to the Public Shareholders in accordance with the terms of the Trust Agreement and the Memorandum and Articles.
Upon the distribution of all the funds, net of any payments necessary for reasonable unreimbursed expenses related to liquidating
the Trust Account, your obligations under the Trust Agreement shall be terminated, except to the extent otherwise provided in Section 1(j)
of the Trust Agreement.

 

	 	Very truly yours,
	 	 
	 	TortoiseEcofin
    Acquisition Corp. III

 

	 	By:	 
	 	Name: 	 
	 	Title: 	 

 

		cc:	Barclays Capital Inc. and Goldman Sachs & Co. LLC

 

    Exhibit B-1

     

    

 

Exhibit C

 

[Letterhead of Company]

 

[Insert date]

 

Continental Stock Transfer & Trust
Company

1 State Street, 30th Floor

New York, New York 10004

Attn: Francis Wolf and Celeste Gonzalez

 

		Re:	Trust Account - Tax Payment Withdrawal Instruction

 

Dear Mr. Wolf and Ms. Gonzalez:

 

Pursuant to Section 1(j)
of the Investment Management Trust Agreement between TortoiseEcofin Acquisition Corp. III (the “Company”)
and Continental Stock Transfer & Trust Company (the “Trustee”), dated as of [●], 2021 (the
“Trust Agreement”), the Company hereby requests that you deliver to the Company $
of the interest income earned on the Property as of the date hereof. Capitalized terms used but not defined herein shall have the
meanings set forth in the Trust Agreement.

 

The Company needs such
funds to pay for the tax obligations as set forth on the attached tax return or tax statement. In accordance with the terms of
the Trust Agreement, you are hereby directed and authorized to transfer (via wire transfer) such funds promptly upon your receipt
of this letter to the Company’s operating account at:

 

[WIRE INSTRUCTION INFORMATION]

 

	 	Very truly yours,
	 	 
	 	TortoiseEcofin
    Acquisition Corp. III

 

	 	By:	 
	 	Name: 	 
	 	Title: 	 

 

		cc:	Barclays Capital Inc. and Goldman Sachs & Co. LLC

 

    Exhibit C-1

     

    

 

Exhibit D

 

[Letterhead of Company]

 

[Insert date]

 

Continental Stock Transfer & Trust
Company

1 State Street, 30th Floor

New York, New York 10004

Attn: Francis Wolf and Celeste Gonzalez

 

		Re:	Trust Account - Shareholder Redemption Withdrawal Instruction

 

Dear Mr. Wolf and Ms. Gonzalez:

 

Pursuant to Section 1(k)
of the Investment Management Trust Agreement between TortoiseEcofin Acquisition Corp. III (the “Company”)
and Continental Stock Transfer & Trust Company (the “Trustee”), dated as of [●], 2021 (the
“Trust Agreement”), the Company hereby requests that you deliver to the redeeming Public Shareholders
of the Company $      of the principal
and interest income earned on the Property as of the date hereof. Capitalized terms used but not defined herein shall have the
meanings set forth in the Trust Agreement.

 

The Company needs such
funds to pay its Public Shareholders who have properly elected to have their Ordinary Shares redeemed by the Company in connection
with a shareholder vote to approve an amendment to the Company’s amended and restated memorandum and articles of association
(the “Memorandum and Articles”) that affects the substance or timing of the Company’s obligation
to redeem one hundred percent (100%) of its public Ordinary Shares if the Company has not consummated an initial Business Combination
within such time as is described in the Memorandum and Articles. As such, you are hereby directed and authorized to transfer (via
wire transfer) such funds promptly upon your receipt of this letter to the redeeming Public Shareholders in accordance with your
customary procedures.

 

	 	Very truly yours,
	 	 
	 	TortoiseEcofin
    Acquisition Corp. III

 

	 	By:	 
	 	Name: 	 
	 	Title: 	 

 

		cc:	Barclays Capital Inc. and Goldman Sachs & Co. LLC

  

 

Exhibit D-1Exhibit 10.4

 

REGISTRATION RIGHTS AGREEMENT

 

THIS REGISTRATION RIGHTS
AGREEMENT (this “Agreement”), dated as of [●], 2021, is made and entered into by and among TortoiseEcofin
Acquisition Corp. III, a Cayman Islands exempted company (the “Company”), TortoiseEcofin Sponsor III
LLC, a Cayman Islands limited liability company (the “Sponsor”), TortoiseEcofin Borrower LLC, a Delaware
limited liability company (“TortoiseEcofin Borrower”), and the undersigned parties listed under Holder
on the signature pages hereto (each such party, together with the Sponsor, TortoiseEcofin Borrower and any person or entity who
hereafter becomes a party to this Agreement pursuant to Section 5.2 of this Agreement, a “Holder”
and collectively the “Holders”).

 

RECITALS

 

WHEREAS, the
Sponsor owns an aggregate of 8,625,000 of the Company’s Class B ordinary shares, par value $0.0001 per share (the “Founder
Shares”);

 

WHEREAS, the
Founder Shares will automatically convert into the Company’s Class A ordinary shares, par value $0.0001 per share (the “Ordinary
Shares”), at the time of the Company’s initial Business Combination (as defined below) on a one-for-one basis,
subject to adjustment, on the terms and conditions provided in the Company’s amended and restated memorandum and articles
of association, as may be further amended from time to time;

 

WHEREAS, on
[●], 2021, the Company and TortoiseEcofin Borrower entered into that certain Private Placement Shares Purchase Agreement,
pursuant to which TortoiseEcofin Borrower agreed to purchase 850,000 shares (or 940,000 shares if the over-allotment option in
connection with the Company’s initial public offering is exercised in full) (the “Private Placement Shares”)
in a private placement transaction occurring in connection with the closing of the Company’s initial public offering; and

 

WHEREAS, the
Company and the Holders desire to enter into this Agreement, pursuant to which the Company shall grant the Holders certain registration
rights with respect to certain securities of the Company, as set forth in this Agreement.

 

NOW, THEREFORE,
in consideration of the representations, covenants and agreements contained herein, and certain other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the parties hereto, intending to be legally bound, hereby agree as
follows:

 

Article 1

DEFINITIONS

 

1.1 Definitions.
The terms defined in this Article 1 shall, for all purposes of this Agreement, have the respective meanings
set forth below:

 

“Adverse
Disclosure” shall mean any public disclosure of material non-public information, which disclosure, in the good faith
judgment of the Chief Executive Officer or principal financial officer of the Company, after consultation with counsel to the Company,
(a) would be required to be made in (i) any Registration Statement in order for the applicable Registration Statement not
to contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary
to make the statements therein not misleading or (ii) any Prospectus in order for the applicable Prospectus not to include any
untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the
light of the circumstances under which they were made, not misleading, (b) would not be required to be made at such time if
the Registration Statement were not being filed and (c) the Company has a bona fide business purpose for not making such information
public.

 

     

     

    

 

“Agreement”
shall have the meaning given in the Preamble.

 

“Board”
shall mean the board of directors of the Company.

 

“Business
Combination” shall mean any merger, amalgamation, share exchange, asset acquisition, share purchase, reorganization
or other similar business combination with one or more businesses or entities, involving the Company.

 

“Commission”
shall mean the Securities and Exchange Commission.

 

“Company”
shall have the meaning given in the Preamble.

 

“Demanding
Holder” shall mean any Initial Holder or group of Initial Holders, that together elects to dispose of Registrable
Securities having an aggregate value of at least $25 million, at the time of the Underwritten Demand, under a Registration Statement
pursuant to an Underwritten Offering.

 

“Effectiveness
Period” shall have the meaning given in subsection 3.1.1.

 

“Exchange
Act” shall mean the Securities Exchange Act of 1934, as it may be amended from time to time.

 

“Founder
Shares” shall have the meaning given in the Recitals hereto.

 

“Holder
Indemnified Persons” shall have the meaning given in subsection 4.1.1.

 

“Holders”
shall have the meaning given in the Preamble.

 

“Initial
Holders” shall mean the Sponsor, TortoiseEcofin Borrower and each of the undersigned officers, directors and director
nominees of the Company listed under Holder on the signature pages hereto.

 

“Maximum
Number of Securities” shall have the meaning given in subsection 2.1.4.

 

“Misstatement”
shall mean, in the case of a Registration Statement, an untrue statement of a material fact or an omission to state a material
fact required to be stated therein, or necessary to make the statements therein not misleading, and in the case of a Prospectus,
an untrue statement of a material fact or an omission to state a material fact necessary in order to make the statements therein,
in the light of the circumstances under which they were made, not misleading.

 

“Ordinary
Shares” shall have the meaning given in the Recitals hereto.

 

    2

     

    

 

“Piggyback
Registration” shall have the meaning given in subsection 2.2.1.

 

“Private
Placement Shares” shall have the meaning given in the Recitals hereto.

 

“Pro Rata”
shall have the meaning given in subsection 2.1.4.

 

“Prospectus”
shall mean the prospectus included in any Registration Statement, as supplemented by any and all prospectus supplements and as
amended by any and all post-effective amendments and including all material incorporated by reference in such prospectus.

 

“Registrable
Security” shall mean (a) the Ordinary Shares issued or issuable upon the conversion of any Founder Shares, (b) the
Private Placement Shares, (c) any outstanding Ordinary Shares or any other equity security (including the Ordinary Shares issued
or issuable upon the exercise of any other equity security) of the Company held by a Holder as of the date of this Agreement or
acquired prior to or in connection with the Business Combination, which, for the avoidance of doubt, shall include any Ordinary
Shares received by a Holder on or after the date hereof as a distribution from the Sponsor in connection with its liquidation and
dissolution, (d) any equity securities (including the Ordinary Shares issued or issuable upon the exercise of any such equity
security) of the Company issuable upon conversion of any working capital loans in an amount up to $1,500,000 made to the Company
by a Holder and (e) any other equity security of the Company issued or issuable with respect to any such Ordinary Shares by
way of a share capitalization or share sub-division or in connection with a combination of shares, merger, consolidation or reorganization;
provided, however, that, as to any particular Registrable Securities, such securities shall cease to be Registrable Securities
when: (i) a Registration Statement with respect to the sale of such securities shall have become effective under the Securities
Act and such securities shall have been sold, transferred, disposed of or exchanged in accordance with such Registration Statement;
(ii) such securities shall have been otherwise transferred, new certificates for such securities not bearing a legend restricting
further transfer shall have been delivered by the Company and subsequent public distribution of such securities shall not require
registration under the Securities Act; (iii) such securities shall have ceased to be outstanding; or (iv) such securities may be
sold without registration pursuant to Rule 144 promulgated under the Securities Act (or any successor rule promulgated thereafter
by the Commission) (but with no volume or other restrictions or limitations).

 

“Registration”
shall mean a registration effected by preparing and filing a registration statement or similar document in compliance with the
requirements of the Securities Act, and the applicable rules and regulations promulgated thereunder, and any such registration
statement having become effective by the Commission.

 

“Registration
Expenses” shall mean the out-of-pocket expenses of a Registration, including, without limitation, the following:

 

(a) all
registration and filing fees (including fees with respect to filings required to be made with the Financial Industry Regulatory
Authority) and any securities exchange on which the Ordinary Shares are then listed;

 

    3

     

    

 

(b) fees
and expenses of compliance with securities or blue sky laws (including reasonable fees and disbursements of counsel for the Underwriters
in connection with blue sky qualifications of Registrable Securities);

 

(c) printing,
messenger, telephone and delivery expenses;

 

(d) reasonable
fees and disbursements of counsel for the Company;

 

(e) reasonable
fees and disbursements of all independent registered public accountants of the Company incurred specifically in connection with
such Registration or Underwritten Offering;

 

(f) the
fees and expenses incurred in connection with the listing of any Registrable Securities on each securities exchange or automated
quotation system on which similar securities issued by the Company are then listed;

 

(g) the
fees and expenses incurred by the Company in connection with any road show for any Underwritten Offerings; and

 

(h) reasonable
fees and expenses of one (1) legal counsel selected jointly by the Demanding Holders initiating an Underwritten Demand, the
Requesting Holders participating in an Underwritten Offering and the Holders participating in a Piggyback Registration, as applicable.

 

“Registration
Statement” shall mean any registration statement under the Securities Act that covers the Registrable Securities
pursuant to the provisions of this Agreement, including the Prospectus included in such registration statement, amendments (including
post-effective amendments) and supplements to such registration statement and all exhibits to and all material incorporated by
reference in such registration statement.

 

“Requesting
Holder” shall have the meaning given in subsection 2.1.3.

 

“Securities
Act” shall mean the Securities Act of 1933, as amended from time to time.

 

“Shelf
Registration” shall have the meaning given in subsection 2.1.1.

 

“Sponsor”
shall have the meaning given in the Preamble.

 

“TortoiseEcofin
Borrower” shall have the meaning given in the Preamble.

 

“Underwriter”
shall mean a securities dealer who purchases any Registrable Securities as principal in an Underwritten Offering and not as part
of such dealer’s market-making activities.

 

“Underwritten
Demand” shall have the meaning given in subsection 2.1.3.

 

“Underwritten
Offering” shall mean a Registration in which securities of the Company are sold to an Underwriter in a firm commitment
underwriting for distribution to the public.

 

    4

     

    

 

Article 2

REGISTRATIONS

 

2.1 Registration.

 

2.1.1 Shelf
Registration. The Company agrees that, within thirty (30) days after the consummation of the Business Combination, the Company
will file with the Commission (at the Company’s sole cost and expense) a Registration Statement registering the resale or
other disposition of the Registrable Securities (a “Shelf Registration”).

 

2.1.2 Effective
Registration. The Company shall use its reasonable best efforts to cause such Registration Statement to become effective by
the Commission as soon as reasonably practicable after the initial filing of the Registration Statement. Subject to the limitations
contained in this Agreement, the Company shall effect any Shelf Registration on such appropriate registration form of the Commission
(a) as shall be selected by the Company and (b) as shall permit the resale or other disposition of the Registrable Securities
by the Holders. If at any time a Registration Statement filed with the Commission pursuant to Section 2.1.1 is effective
and a Holder provides written notice to the Company that it intends to effect an offering of all or part of the Registrable Securities
included on such Registration Statement, the Company will use its reasonable best efforts to amend or supplement such Registration
Statement as may be necessary in order to enable such offering to take place in accordance with the terms of this Agreement.

 

2.1.3 Underwritten
Offering. Subject to the provisions of subsection 2.1.4 and Section 2.3 hereof, any Demanding Holder
may make a written demand for an Underwritten Offering pursuant to a Registration Statement filed with the Commission in accordance
with Section 2.1.1 (an “Underwritten Demand”). The Company shall, within five (5) business days
of the Company’s receipt of the Underwritten Demand, notify, in writing, all other Holders of such demand, and each Holder
who thereafter requests to include all or a portion of such Holder’s Registrable Securities in such Underwritten Offering
pursuant to such Underwritten Demand (each such Holder that requests to include all or a portion of such Holder’s Registrable
Securities in such Underwritten Offering, a “Requesting Holder”) shall so notify the Company, in writing,
within two (2) days (one (1) day if such offering is an overnight or bought Underwritten Offering) after the receipt
by the Holder of the notice from the Company. Upon receipt by the Company of any such written notification from a Requesting Holder(s),
such Requesting Holder(s) shall be entitled to have their Registrable Securities included in such Underwritten Offering pursuant
to such Underwritten Demand. All such Holders proposing to distribute their Registrable Securities through such Underwritten Offering
under this subsection 2.1.3 shall enter into an underwriting agreement in customary form with the Underwriter(s) selected
for such Underwritten Offering by the Demanding Holders initiating such Underwritten Offering. Notwithstanding the foregoing, the
Company is not obligated to effect more than an aggregate of three (3) Underwritten Offerings pursuant to this subsection 2.1.3
and is not obligated to effect an Underwritten Offering pursuant to this subsection 2.1.3 within ninety (90) days after
the closing of an Underwritten Offering.

 

    5

     

    

 

2.1.4 Reduction
of Underwritten Offering. If the managing Underwriter or Underwriters in an Underwritten Offering pursuant to an Underwritten
Demand, in good faith, advises the Company, the Demanding Holders, the Requesting Holders and other persons or entities holding
Ordinary Shares or other equity securities of the Company that the Company is obligated to include pursuant to separate written
contractual arrangements with such persons or entities (if any) in writing that the dollar amount or number of Registrable Securities
or other equity securities of the Company requested to be included in such Underwritten Offering exceeds the maximum dollar amount
or maximum number of equity securities of the Company that can be sold in the Underwritten Offering without adversely affecting
the proposed offering price, the timing, the distribution method or the probability of success of such offering (such maximum dollar
amount or maximum number of such securities, as applicable, the “Maximum Number of Securities”), then
the Company shall include in such Underwritten Offering, as follows: (a) first, the Registrable Securities of the Demanding
Holders (pro rata based on the respective number of Registrable Securities that each Demanding Holder has requested be included
in such Underwritten Offering and the aggregate number of Registrable Securities that the Demanding Holders have requested be included
in such Underwritten Offering (such proportion is referred to herein as “Pro Rata”)) that can be sold
without exceeding the Maximum Number of Securities; (b) second, to the extent that the Maximum Number of Securities has not
been reached under the foregoing clause (a), the Registrable Securities of the Requesting Holders, Pro Rata, which
can be sold without exceeding the Maximum Number of Securities; (c) third, to the extent that the Maximum Number of Securities
has not been reached under the foregoing clauses (a) and (b), Ordinary Shares or other equity securities of
the Company that the Company desires to sell and that can be sold without exceeding the Maximum Number of Securities; and (d) fourth,
to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses (a), (b)
and (c), Ordinary Shares or other equity securities of the Company held by other persons or entities that the Company
is obligated to include pursuant to separate written contractual arrangements with such persons or entities and that can be sold
without exceeding the Maximum Number of Securities.

 

2.2 Piggyback
Registration.

 

2.2.1 Piggyback
Rights. Subject to the provisions of subsection 2.2.2 and Section 2.3 hereof, if, at any time on or
after the date the Company consummates a Business Combination, the Company proposes to consummate an Underwritten Offering for
its own account or for the account of shareholders of the Company, then the Company shall give written notice of such proposed
action to all of the Holders as soon as practicable, which notice shall (a) describe the amount and type of securities to
be included, the intended method(s) of distribution and the name of the proposed managing Underwriter or Underwriters, if any,
and (b) offer to all of the Holders the opportunity to include of such number of Registrable Securities as such Holders may
request in writing within two (2) days (unless such offering is an overnight or bought Underwritten Offering, then one (1) day),
in each case after receipt of such written notice (such Registration a “Piggyback Registration”). The
Company shall, in good faith, cause such Registrable Securities to be included in such Piggyback Registration and shall use its
reasonable best efforts to cause the managing Underwriter or Underwriters of a proposed Underwritten Offering to permit the Registrable
Securities requested by the Holders pursuant to this subsection 2.2.1 to be included in a Piggyback Registration on
the same terms and conditions as any similar securities of the Company included in such Piggyback Registration and to permit the
resale or other disposition of such Registrable Securities in accordance with the intended method(s) of distribution thereof. All
such Holders proposing to include Registrable Securities in an Underwritten Offering under this subsection 2.2.1 shall
enter into an underwriting agreement in customary form with the Underwriter(s) selected for such Underwritten Offering by the Company.

 

    6

     

    

 

2.2.2 Reduction
of Piggyback Registration. If the managing Underwriter or Underwriters in an Underwritten Offering that is to be a Piggyback
Registration, in good faith, advises the Company and the Holders of Registrable Securities participating in the Piggyback Registration
in writing that the dollar amount or number of shares or equity securities of the Company that the Company desires to sell, taken
together with (a) the shares or equity securities of the Company, if any, as to which the Underwritten Offering has been demanded
pursuant to separate written contractual arrangements with persons or entities other than the Holders of Registrable Securities
hereunder, (b) the Registrable Securities as to which a Piggyback Registration has been requested pursuant to Section 2.2
hereof and (c) the shares or equity securities of the Company, if any, as to which inclusion in the Underwritten Offering
has been requested pursuant to separate written contractual piggyback registration rights of other shareholders of the Company,
exceeds the Maximum Number of Securities, then:

 

(i) If
the Underwritten Offering is undertaken for the Company’s account, the Company shall include in any such Underwritten Offering
(A) first, the Ordinary Shares or other equity securities of the Company that the Company desires to sell, which can be sold
without exceeding the Maximum Number of Securities; (B) second, to the extent that the Maximum Number of Securities has not
been reached under the foregoing clause (A), the Registrable Securities of Holders requesting a Piggyback Registration
pursuant to subsection 2.2.1 hereof, Pro Rata, which can be sold without exceeding the Maximum Number of Securities;
and (C) third, to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses (A)
and (B), Ordinary Shares or other equity securities of the Company, if any, as to which inclusion in the Underwritten
Offering has been requested pursuant to written contractual piggyback registration rights of other shareholders of the Company,
which can be sold without exceeding the Maximum Number of Securities; or

 

(ii) If
the Underwritten Offering is pursuant to a request by persons or entities other than the Holders of Registrable Securities, then
the Company shall include in any such Underwritten Offering (A) first, Ordinary Shares or other equity securities of the Company,
if any, of such requesting persons or entities, other than the Holders, which can be sold without exceeding the Maximum Number
of Securities; (B) second, to the extent that the Maximum Number of Securities has not been reached under the foregoing clause (A),
the Registrable Securities of Holders requesting a Piggyback Registration pursuant to subsection 2.2.1, Pro Rata, which
can be sold without exceeding the Maximum Number of Securities; (C) third, to the extent that the Maximum Number of Securities
has not been reached under the foregoing clauses (A) and (B), Ordinary Shares or other equity securities
of the Company that the Company desires to sell, which can be sold without exceeding the Maximum Number of Securities; and (D) fourth,
to the extent that the Maximum Number of Securities has not been reached under the foregoing clauses (A), (B)
and (C), Ordinary Shares or other equity securities of the Company for the account of other persons or entities that
the Company is obligated to register pursuant to separate written contractual arrangements with such persons or entities, which
can be sold without exceeding the Maximum Number of Securities.

 

2.2.3 Piggyback
Registration Withdrawal. Any Holder shall have the right to withdraw from a Piggyback Registration for any or no reason whatsoever
upon written notification to the Company and the Underwriter or Underwriters (if any) of his, her or its intention to withdraw
from such Piggyback Registration prior to the commencement of the Underwritten Offering. Notwithstanding anything to the contrary
in this Agreement, the Company shall be responsible for the Registration Expenses incurred in connection with the Piggyback Registration
prior to its withdrawal under this subsection 2.2.3.

 

    7

     

    

 

2.2.4 Unlimited
Piggyback Registration Rights. For purposes of clarity, any Registration or Underwritten Offering effected pursuant to Section 2.2
hereof shall not be counted as an Underwritten Offering pursuant to an Underwritten Demand effected under Section 2.1
hereof.

 

2.3 Restrictions
on Registration Rights. If (a) the Holders have requested an Underwritten
Offering pursuant to an Underwritten Demand and the Company and the Holders are unable to obtain the commitment of underwriters
to firmly underwrite the offer; or (b) the Holders have requested an Underwritten Offering pursuant to an Underwritten Demand
and in the good faith judgment of the Board such Underwritten Offering would be seriously detrimental to the Company and the Board
concludes as a result that it is essential to defer the undertaking of such Underwritten Offering at such time, then in each case
the Company shall furnish to such Holders a certificate signed by the Chairman of the Board stating that in the good faith judgment
of the Board it would be seriously detrimental to the Company to undertake such Underwritten Offering in the near future and that
it is therefore essential to defer the undertaking of such Underwritten Offering. In such event, the Company shall have the right
to defer such offering for a period of not more than thirty (30) days; provided, however, that the Company shall not defer its
obligation in this manner more than once in any twelve (12)-month period.

 

Article 3

COMPANY PROCEDURES

 

3.1 General
Procedures. The Company shall use its reasonable best efforts to effect
such Registration or Underwritten Offering to permit the resale or other disposition of such Registrable Securities in accordance
with the intended plan of distribution thereof, and pursuant thereto the Company shall, as expeditiously as possible and to the
extent applicable:

 

3.1.1 prepare
and file with the Commission after the consummation of the Business Combination a Registration Statement with respect to such Registrable
Securities and use its reasonable best efforts to cause such Registration Statement to become effective in accordance with Section 2.1
and remain effective, including filing a replacement Registration Statement, if necessary, until all Registrable Securities covered
by such Registration Statement have been sold or are no longer outstanding (such period, the “Effectiveness Period”);

 

3.1.2 prepare
and file with the Commission such amendments and post-effective amendments to the Registration Statement, and such supplements
to the Prospectus, as may be reasonably requested by the Holders or any Underwriter or as may be required by the rules, regulations
or instructions applicable to the registration form used by the Company or by the Securities Act or rules and regulations thereunder
to keep the Registration Statement effective until all Registrable Securities covered by such Registration Statement are sold in
accordance with the intended plan of distribution set forth in such Registration Statement or supplement to the Prospectus or are
no longer outstanding;

 

    8

     

    

 

3.1.3 prior
to filing a Registration Statement or Prospectus, or any amendment or supplement thereto, furnish without charge to the Underwriters,
if any, and the Holders of Registrable Securities included in such Registration or Underwritten Offering, and such Holders’
legal counsel, copies of such Registration Statement as proposed to be filed, each amendment and supplement to such Registration
Statement (in each case including all exhibits thereto and documents incorporated by reference therein), the Prospectus (including
each preliminary Prospectus) and such other documents as the Underwriters and the Holders of Registrable Securities included in
such Registration or Underwritten Offering or the legal counsel for any such Holders may reasonably request in order to facilitate
the disposition of the Registrable Securities owned by such Holders; provided, that the Company will not have any obligation to
provide any document pursuant to this clause that is available on the Commission’s EDGAR system;

 

3.1.4 prior
to any Underwritten Offering of Registrable Securities, use its best efforts to (a) register or qualify the Registrable Securities
covered by the Registration Statement under such securities or “blue sky” laws of such jurisdictions
in the United States as the Holders of Registrable Securities included in such Registration Statement (in light of their intended
plan of distribution) may request and (b) take such action necessary to cause such Registrable Securities covered by the Registration
Statement to be registered with or approved by such other governmental authorities as may be necessary by virtue of the business
and operations of the Company and do any and all other acts and things that may be necessary or advisable to enable the Holders
of Registrable Securities included in such Registration Statement to consummate the disposition of such Registrable Securities
in such jurisdictions; provided, however, that the Company shall not be required to qualify generally to do business in any jurisdiction
where it would not otherwise be required to qualify or take any action to which it would be subject to general service of process
or taxation in any such jurisdiction where it is not then otherwise so subject;

 

3.1.5 cause
all such Registrable Securities to be listed on each securities exchange or automated quotation system on which similar securities
issued by the Company are then listed;

 

3.1.6 provide
a transfer agent or warrant agent, as applicable, and registrar for all such Registrable Securities no later than the effective
date of such Registration Statement or Underwritten Offering;

 

3.1.7 advise
each seller of such Registrable Securities, promptly after it shall receive notice or obtain knowledge thereof, of the issuance
of any stop order by the Commission suspending the effectiveness of such Registration Statement or the initiation or threatening
of any proceeding for such purpose and promptly use its reasonable best efforts to prevent the issuance of any stop order or to
obtain its withdrawal if such stop order should be issued;

 

3.1.8 during
the Effectiveness Period, furnish a conformed copy of each filing of any Registration Statement or Prospectus or any amendment
or supplement to such Registration Statement or Prospectus or any document that is to be incorporated by reference into such Registration
Statement or Prospectus, promptly after such filing of such documents with the Commission to each seller of such Registrable Securities
or its counsel; provided, that the Company will not have any obligation to provide any document pursuant to this clause that is
available on the Commission’s EDGAR system;

 

    9

     

    

 

3.1.9 notify
the Holders at any time when a Prospectus relating to such Registration Statement is required to be delivered under the Securities
Act, of the happening of any event as a result of which the Prospectus included in such Registration Statement, as then in effect,
includes a Misstatement, and then to correct such Misstatement as set forth in Section 3.4 hereof;

 

3.1.10 permit
a representative of the Holders, the Underwriters, if any, and any attorney or accountant retained by such Holders or Underwriter
to participate, at each such person’s own expense, in the preparation of the Registration Statement or the Prospectus, and
cause the Company’s officers, directors and employees to supply all information reasonably requested by any such representative,
Underwriter, attorney or accountant in connection with the Registration; provided, however, that such representatives or Underwriters
enter into a confidentiality agreement, in form and substance reasonably satisfactory to the Company, prior to the release or disclosure
of any such information;

 

3.1.11 obtain
a comfort letter from the Company’s independent registered public accountants in the event of an Underwritten Offering, in
customary form and covering such matters of the type customarily covered by comfort letters as the managing Underwriter may reasonably
request, and reasonably satisfactory to a majority-in-interest of the participating Holders;

 

3.1.12 on
the date the Registrable Securities are delivered for sale pursuant to such Registration, obtain an opinion, dated such date, of
counsel representing the Company for the purposes of such Registration, addressed to the placement agent or sales agent, if any,
and the Underwriters, if any, covering such legal matters with respect to the Registration in respect of which such opinion is
being given as the placement agent, sales agent or Underwriter may reasonably request and as are customarily included in such opinions
and negative assurance letters, and reasonably satisfactory to such placement agent, sales agent or Underwriter;

 

3.1.13 in
the event of any Underwritten Offering, enter into and perform its obligations under an underwriting agreement, in usual and customary
form, with the managing Underwriter of such offering;

 

3.1.14 make
available to its security holders, as soon as reasonably practicable, an earnings statement covering the period of at least twelve
(12) months beginning with the first day of the Company’s first full calendar quarter after the effective date of the Registration
Statement which satisfies the provisions of Section 11(a) of the Securities Act and Rule 158 thereunder (or any successor
rule promulgated thereafter by the Commission);

 

3.1.15 use
its reasonable efforts to make available senior executives of the Company to participate in customary “road show”
presentations that may be reasonably requested by the Underwriter in any Underwritten Offering; and

 

3.1.16 otherwise,
in good faith, cooperate reasonably with, and take such customary actions as may reasonably be requested by the Holders, in connection
with such Registration.

 

    10

     

    

 

3.2 Registration
Expenses. The
Registration Expenses in respect of all Registrations shall be borne by the Company. It is acknowledged by the Holders that the
Holders shall bear all incremental selling expenses relating to the sale of Registrable Securities, such as Underwriters’
commissions and discounts, brokerage fees, Underwriter marketing costs and, other than as set forth in the definition of “Registration
Expenses,” all reasonable fees and expenses of any legal counsel representing
the Holders.

 

3.3 Requirements
for Participation in Underwritten Offerings. No person or
entity may participate in any Underwritten Offering for equity securities of the Company pursuant to a Registration initiated
by the Company hereunder unless such person or entity (a) agrees to sell such person’s or entity’s securities
on the basis provided in any underwriting arrangements approved by the Company and (b) completes and executes all customary
questionnaires, powers of attorney, indemnities, lock-up agreements, underwriting agreements and other customary documents as
may be reasonably required under the terms of such underwriting arrangements.

 

3.4 Suspension
of Sales; Adverse Disclosure. Upon
receipt of written notice from the Company that a Registration Statement or Prospectus contains or includes a Misstatement, each
of the Holders shall forthwith discontinue disposition of Registrable Securities until he, she or it has received copies of a
supplemented or amended Registration Statement or Prospectus correcting the Misstatement (it being understood that the Company
hereby covenants to prepare and file such supplement or amendment as soon as practicable after the time of such notice), or until
he, she or it is advised in writing by the Company that the use of the Registration Statement or Prospectus may be resumed. If
the filing, initial effectiveness or continued use of a Registration Statement in respect of any Registration or Underwritten
Offering at any time would require the Company to make an Adverse Disclosure or would require the inclusion in such Registration
Statement of financial statements that are unavailable to the Company for reasons beyond the Company’s control, the Company
may, upon giving prompt written notice of such action to the Holders, delay the filing or initial effectiveness of, or suspend
use of, such Registration Statement for the shortest period of time, but in no event more than thirty (30) days, determined in
good faith by the Company to be necessary for such purpose. In the event the Company exercises its rights under the preceding
sentences in this Section 3.4, the Holders agree to suspend, immediately upon their receipt of the notices referred
to in this Section 3.4, their use of the Registration Statement or Prospectus in connection with any resale or other
disposition of Registrable Securities. The Company shall immediately notify the Holders of the expiration of any period during
which it exercised its rights under this Section 3.4.

 

3.5 Reporting
Obligations. As
long as any Holder shall own Registrable Securities, the Company, at all times while it shall be a reporting company under the
Exchange Act, covenants to file timely (or obtain extensions in respect thereof and file within the applicable grace period) all
reports required to be filed by the Company after the date hereof pursuant to Section 13(a) or 15(d) of the Exchange Act.
The Company further covenants that it shall take such further action as any Holder may reasonably request, all to the extent required
from time to time to enable such Holder to resell or otherwise dispose of Registrable Securities held by such Holder without registration
under the Securities Act within the limitation of the exemptions provided by Rule 144 promulgated under the Securities Act
(or any successor rule promulgated thereafter by the Commission), including providing any legal opinions. Upon the request of
any Holder, the Company shall deliver to such Holder a written certification of a duly authorized officer as to whether it has
complied with such requirements.

 

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Article 4

INDEMNIFICATION AND CONTRIBUTION

 

4.1 Indemnification.

 

4.1.1 The
Company agrees to indemnify, to the extent permitted by law, each Holder of Registrable Securities, its officers, directors, employees,
advisors, agents, representatives, members and each person who controls such Holder (within the meaning of the Securities Act)
(collectively, the “Holder Indemnified Persons”) against all losses, claims, damages, liabilities and
expenses (including reasonable attorneys’ fees and inclusive of all reasonable attorneys’ fees arising out of the enforcement
of each such persons’ rights under this Section 4.1) resulting from any Misstatement, except insofar as the same
are caused by or contained or included in any information furnished in writing to the Company by or on behalf of such Holder Indemnified
Person specifically for use therein.

 

4.1.2 In
connection with any Registration Statement in which a Holder of Registrable Securities is participating, such Holder shall furnish
to the Company in writing such information and affidavits as the Company reasonably requests for use in connection with any such
Registration Statement or Prospectus and, to the extent permitted by law, shall, severally and not jointly, indemnify the Company,
its officers, directors, employees, advisors, agents, representatives and each person who controls the Company (within the meaning
of the Securities Act) against any losses, claims, damages, liabilities and expenses (including reasonable attorneys’ fees
and inclusive of all reasonable attorneys’ fees arising out of the enforcement of each such persons’ rights under this
Section 4.1) resulting from any Misstatement, but only to the extent that the same are made in reliance on and in conformity
with information relating to the Holder so furnished in writing to the Company by or on behalf of such Holder specifically for
use therein. In no event shall the liability of any selling Holder hereunder be greater in amount than the net proceeds received
by such Holder from the sale of Registrable Securities pursuant to such Registration Statement giving rise to such indemnification
obligation.

 

4.1.3 Any
person entitled to indemnification herein shall (a) give prompt written notice to the indemnifying party of any claim with
respect to which it seeks indemnification (provided that the failure to give prompt notice shall not impair any person’s
right to indemnification hereunder to the extent such failure has not materially prejudiced the indemnifying party) and (b) unless
in such indemnified party’s reasonable judgment a conflict of interest between such indemnified and indemnifying parties
may exist with respect to such claim or there may be reasonable defenses available to the indemnified party that are different
from or additional to those available to the indemnifying party, permit such indemnifying party to assume the defense of such claim
with counsel reasonably satisfactory to the indemnified party. If such defense is assumed, the indemnifying party shall not be
subject to any liability for any settlement made by the indemnified party without its consent (but such consent shall not be unreasonably
withheld). An indemnifying party who is not entitled to, or elects not to, assume the defense of a claim shall not be obligated
to pay the fees and expenses of more than one counsel for all parties indemnified by such indemnifying party with respect to such
claim, unless in the reasonable judgment of any indemnified party a conflict of interest may exist between such indemnified party
and any other of such indemnified parties with respect to such claim. No indemnifying party shall, without the consent of the indemnified
party, consent to the entry of any judgment or enter into any settlement which cannot be settled in all respects by the payment
of money (and such money is so paid by the indemnifying party pursuant to the terms of such settlement) or which settlement does
not include as an unconditional term thereof the giving by the claimant or plaintiff to such indemnified party of a release from
all liability in respect to such claim or litigation.

 

    12

     

    

 

4.1.4 The
indemnification provided for under this Agreement shall remain in full force and effect regardless of any investigation made by
or on behalf of the indemnified party or any officer, director, employee, advisor, agent, representative, member or controlling
person of such indemnified party and shall survive the transfer of securities.

 

4.1.5 If
the indemnification provided under Section 4.1 is held by a court of competent jurisdiction to be unavailable to an
indemnified party in respect of any losses, claims, damages, liabilities and expenses referred to herein, then the indemnifying
party, in lieu of indemnifying the indemnified party, shall to the extent permitted by law contribute to the amount paid or payable
by the indemnified party as a result of such losses, claims, damages, liabilities and expenses in such proportion as is appropriate
to reflect the relative fault of the indemnifying party and the indemnified party, as well as any other relevant equitable considerations.
The relative fault of the indemnifying party and indemnified party shall be determined by a court of law by reference to, among
other things, whether the Misstatement relates to information supplied by such indemnifying party or such indemnified party and
the indemnifying party’s and indemnified party’s relative intent, knowledge, access to information and opportunity
to correct or prevent such action; provided, however, that the liability of any Holder under this subsection 4.1.5
shall be limited to the amount of the net proceeds received by such Holder in such offering giving rise to such liability. The
amount paid or payable by a party as a result of the losses or other liabilities referred to above shall be deemed to include,
subject to the limitations set forth in subsections 4.1.1, 4.1.2 and 4.1.3 above, any legal
or other fees, charges or expenses reasonably incurred by such party in connection with any investigation or proceeding. The parties
hereto agree that it would not be just and equitable if contribution pursuant to this subsection 4.1.5 were determined
by pro rata allocation or by any other method of allocation, which does not take account of the equitable considerations referred
to in this subsection 4.1.5. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f)
of the Securities Act) shall be entitled to contribution pursuant to this subsection 4.1.5 from any person who was
not guilty of such fraudulent misrepresentation.

 

Article 5

MISCELLANEOUS

 

5.1 Notices.
Any notice or communication under this Agreement must be in writing
and given by (a) deposit in the United States mail, addressed to the party to be notified, postage prepaid and registered
or certified with return receipt requested, (b) delivery in person or by courier service or sent by overnight mail via a
reputable overnight carrier, in each case providing evidence of delivery or (c) transmission by facsimile or email. Each
notice or communication that is mailed, delivered or transmitted in the manner described above shall be deemed sufficiently given,
served, sent, and received, in the case of mailed notices, on the third (3rd) business day following the date on which it is mailed,
in the case of notices delivered by courier service, hand delivery or overnight mail, at such time as it is delivered to the addressee
(with the delivery receipt or the affidavit of messenger) or at such time as delivery is refused by the addressee upon presentation,
and in the case of notices delivered by facsimile or email, at such time as it is successfully transmitted to the addressee. Any
notice or communication under this Agreement must be addressed, if to the Company, to: 5100 W. 115th Place, Leawood,
KS 66211, attention: Steve Schnitzer, or by email at: SSchnitzer@tortoiseecofin.com, if to the Sponsor or TortoiseEcofin Borrower,
to: 5100 W. 115th Place, Leawood, KS 66211, attention: Michelle Johnston, or by email at: mjohnston@tortoiseecofin.com,
and, if to any other Holder, to the address of such Holder as it appears in the applicable register for the Registrable Securities
or such other address as may be designated in writing by such Holder (including on the signature pages hereto). Any party may
change its address for notice at any time and from time to time by written notice to the other parties hereto, and such change
of address shall become effective thirty (30) days after delivery of such notice as provided in this Section 5.1.

 

    13

     

    

 

5.2 Assignment;
No Third Party Beneficiaries.

 

5.2.1 This
Agreement and the rights, duties and obligations of the Company hereunder may not be assigned or delegated by the Company in whole
or in part.

 

5.2.2 This
Agreement and the provisions hereof shall be binding upon and shall inure to the benefit of each of the parties and its successors.

 

5.2.3 This
Agreement shall not confer any rights or benefits on any persons that are not parties hereto, other than as expressly set forth
in this Agreement and Section 5.2 hereof.

 

5.2.4 No
assignment by any party hereto of such party’s rights, duties and obligations hereunder shall be binding upon or obligate
the Company unless and until the Company shall have received (a) written notice of such assignment as provided in Section 5.1
hereof and (b) the written agreement of the assignee, in a form reasonably satisfactory to the Company, to be bound by the
terms and provisions of this Agreement (which may be accomplished by an addendum or certificate of joinder to this Agreement).
Any transfer or assignment made other than as provided in this Section 5.2 shall be null and void.

 

5.3 Counterparts.
This Agreement may be executed in multiple counterparts (including
facsimile or PDF counterparts), each of which shall be deemed an original, and all of which together shall constitute the same
instrument, but only one of which need be produced.

 

5.4 Governing
Law; Venue. NOTWITHSTANDING
THE PLACE WHERE THIS AGREEMENT MAY BE EXECUTED BY ANY OF THE PARTIES HERETO, THE PARTIES EXPRESSLY AGREE THAT THIS AGREEMENT SHALL
BE GOVERNED BY AND CONSTRUED UNDER THE LAWS OF THE STATE OF NEW YORK AS APPLIED TO AGREEMENTS AMONG NEW YORK RESIDENTS ENTERED
INTO AND TO BE PERFORMED ENTIRELY WITHIN NEW YORK, WITHOUT REGARD TO THE CONFLICT OF LAW PROVISIONS OF SUCH JURISDICTION.

 

5.5 Amendments
and Modifications. Upon
the written consent of the Company and the Holders of at least a majority in interest of the Registrable Securities at the time
in question, compliance with any of the provisions, covenants and conditions set forth in this Agreement may be waived, or any
of such provisions, covenants or conditions may be amended or modified; provided, however, that notwithstanding the foregoing,
any amendment hereto or waiver hereof that adversely affects any Holder, solely in his, her or its capacity as a holder of the
shares of the Company, in a manner that is materially different from the other Holders (in such capacity) shall require the consent
of each such Holder so affected. No course of dealing between any Holder or the Company and any other party hereto or any failure
or delay on the part of a Holder or the Company in exercising any rights or remedies under this Agreement shall operate as a waiver
of any rights or remedies of any Holder or the Company. No single or partial exercise of any rights or remedies under this Agreement
by a party shall operate as a waiver or preclude the exercise of any other rights or remedies hereunder or thereunder by such
party.

 

5.6 Other
Registration Rights. The
Company represents and warrants that no person, other than a Holder, has any right to require the Company to register any securities
of the Company for sale or to include such securities of the Company in any Registration by the Company for the sale of securities
for its own account or for the account of any other person. Further, the Company represents and warrants that this Agreement supersedes
any other registration rights agreement or agreement with similar terms and conditions and in the event of a conflict between
any such agreement or agreements and this Agreement, the terms of this Agreement shall prevail.

 

5.7 Term.
This Agreement shall terminate upon the earlier of (a) the
tenth (10th) anniversary of the date of this Agreement and (b) the date as of which the Holders cease to hold any Registrable
Securities. The provisions of Article 4 shall survive any termination.

 

[Signature Page Follows]

 

    14

     

    

 

IN WITNESS WHEREOF,
the undersigned have caused this Agreement to be executed as of the date first written above.

 

	 	COMPANY:
	 	 
	 	TortoiseEcofin Acquisition Corp. III
	 	a Cayman Islands exempted company
	 	 
	 	By:	 
	 	Name:	Vincent T. Cubbage
	 	Title:	Chief Executive Officer
	 	 	 
	 	HOLDERS:
	 	 
	 	TORTOISEECOFIN SPONSOR III LLC,
	 	a Cayman Islands limited liability company
	 	 
	 	By:  TORTOISEECOFIN BORROWER LLC, its managing member
	 	 
	 	By:	 
	 	Name:	Michelle Johnston
	 	Title:	Chief Financial Officer
	 	 	 
	 	TORTOISEECOFIN BORROWER LLC,
	 	a Delaware limited liability company
	 	 
	 	By:	                                        
	 	Name:	Michelle Johnston
	 	Title:	Chief Financial Officer
	 	 	 
	 	 
	 	Vincent T. Cubbage
	 	 
	 	Address for notice:
	 	5100 W. 115th Place
	 	Leawood, KS 66211
	 	Attention: Vincent T. Cubbage
	 	Electronic Mail: vcubbage@tortoiseecofin.com

 

[Signature Page to Registration Rights Agreement]

 

     

     

    

 

	 	 
	 	Stephen Pang
	 	 
	 	Address for notice:
	 	5100 W. 115th Place
	 	Leawood, KS 66211
	 	Attention: Stephen Pang
	 	Electronic Mail: spang@tortoiseecofin.com
	 	 
	 	 
	 	Steven C. Schnitzer
	 	 
	 	Address for notice:
	 	5100 W. 115th Place
	 	Leawood, KS 66211
	 	Attention: Steven C. Schnitzer
	 	Electronic Mail: sschnitzer@tortoiseecofin.com
	 	 
	 	 
	 	Darrell Brock, Jr.
	 	 
	 	Address for notice:
	 	5100 W. 115th Place
	 	Leawood, KS 66211
	 	Attention: Darrell Brock, Jr.
	 	Electronic Mail: darrell@brockjr.com
	 	 
	 	 
	 	Evan Zimmer
	 	 
	 	Address for notice:
	 	5100 W. 115th Place
	 	Leawood, KS 66211
	 	Attention: Evan Zimmer
	 	Electronic Mail: ezimmer@tortoiseecofin.com
	 	 
	 	 
	 	Ed Russell
	 	 
	 	Address for notice:
	 	5100 W. 115th Place
	 	Leawood, KS 66211
	 	Attention: Ed Russell
	 	Electronic Mail: erussell@tortoiseecofin.com

 

[Signature Page to Registration Rights Agreement]

 

     

     

    

 

	 	 
	 	[●]	 
	 	 	                                   
	 	Address for notice:
	 	Attention:
	 	Electronic Mail:
	 	 	 
	 	 	 
	 	[●]	 
	 	 	 
	 	Address for notice:
	 	Attention:
	 	Electronic Mail:
	 	 	 
	 	 
	 	[●]	 
	 	 	 
	 	Address for notice:
	 	Attention:
	 	Electronic Mail:

 

[Signature Page to Registration Rights Agreement]

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