Document:

Exhibit
10.3

 

FORM
OF INVESTMENT MANAGEMENT TRUST AGREEMENT

 

This
Investment Management Trust Agreement (this “Agreement”) is made effective as of [              ], 2019 by and between
Tortoise Acquisition Corp., a Delaware corporation (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 units (the “Units”),
each of which consists of one share of the Company’s Class A common stock, par value $0.0001 per share (the “Common
Stock”), and one-half of one warrant, each whole warrant entitling the holder thereof to purchase one share of
Common Stock (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., Goldman Sachs & Co. LLC and UBS Securities LLC as representatives (the “Representatives”)
of the several underwriters (the “Underwriters”) named therein;

 

WHEREAS,
as described in the Registration Statement, $[    ] of the gross proceeds of the Offering and sale of the Private Placement
Warrants (as defined in the Underwriting Agreement) (or $[    ] 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 Common Stock included
in the Units 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 stockholders for whose benefit the Trustee
shall hold the Property will be referred to as the “Public Stockholders,” and the Public Stockholders
and the Company will be referred to together as the “Beneficiaries”);

 

WHEREAS,
pursuant to the Underwriting Agreement, a portion of the Property equal to $[    ], or $[     ] 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 at [             ] 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 180 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;

 

    1

     

    

 

(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 franchise and 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
and (2) such later date as may be approved by the Company’s stockholders in accordance with the Company’s amended
and restated certificate of incorporation, 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
franchise and 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 Stockholders of record as of such date; provided, however, that in the event the Trustee
receives a Termination Letter in a form substantially similar to Exhibit B hereto, or if the Trustee begins to liquidate
the Property because it has received no such Termination Letter by the date specified in clause (y) of this Section 1(i),
the Trustee shall keep the Trust Account open until twelve (12) months following the date the Property has been distributed to
the Public Stockholders;

 

(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 or franchise 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; provided, further, that if the tax to be paid is
a franchise tax, the written request by the Company to make such distribution shall be accompanied by a copy of the franchise
tax bill from the State of Delaware for the Company and a written statement from the principal financial officer of the Company
setting forth the actual amount payable. 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 “Stockholder Redemption Withdrawal Instruction”), the Trustee shall distribute
on behalf of the Company the amount requested by the Company to be used to redeem shares of Common Stock from Public Stockholders
properly submitted in connection with a stockholder vote to approve an amendment to the Company’s amended and restated certificate
of incorporation that would affect the substance or timing of the Company’s obligation to redeem one hundred percent (100%)
of its public shares of Common Stock if the Company has not consummated an initial Business Combination within such time as is
described in the Company’s amended and restated certificate of incorporation. 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

 

    2

     

    

 

(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. 
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 stockholders regarding a merger, capital stock exchange, asset acquisition,
stock purchase, reorganization or similar business combination involving the Company and one or more businesses (the “Business
Combination”), provide to the Trustee an affidavit or certificate of the inspector of elections for the stockholder
meeting verifying the vote of such stockholders 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

 

    3

     

    

 

(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 $[      ].

 

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

     

    

 

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.

 

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 shares of Common Stock and shares of Class B common stock,
par value $0.0001 per share, of the Company, voting together as a single class; provided that no such amendment will affect
any Public Stockholder who has properly elected to redeem his, her or its shares of Common Stock in connection with a stockholder
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 shares of Common Stock if the Company does not complete its initial Business Combination
within the time frame specified in the Company’s amended and restated certificate of incorporation), 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 Celest Gonzalez

Email: fwolf@continentalstock.com

Email: cgonzalez@continentalstock.com

 

if
to the Company, to:

 

Tortoise
Acquisition Corp.

452 Fifth Avenue, 14th Floor

New York, NY 10018

Attn: Steven Schnitzer

Fax No.:

 

in
each case, with copies to:

 

Vinson
& Elkins L.L.P.

666 Fifth Avenue, 26th Floor

New York, New York

Attn: Brenda Lenahan

Fax No.: (212) 237-0100

 

and

 

Barclays
Capital Inc. Goldman Sachs & Co. LLC and UBS Securities 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.:

 

UBS
Securities LLC

1285 Avenue of the Americas

New York, New York 10019

Attn: General Counsel

 

Fax
No.:

 

and

 

Skadden,
Arps, Slate, Meagher & Flom LLP

525 University Avenue, Suite 1400

Palo Alto, California 94301

Attn: Gregg A. Noel and Jonathan B. Ko

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] 

    6

     

    

 

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:	 
	 	Title:	 
	 	 	 
	 	Tortoise Acquisition Corp.
	 	 
	 	By:	 
	 	Name:	         
	 	Title:	 

  

[Signature
Page to Investment Management Trust Agreement]

 

    7

     

    

 

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) or 1(k)	 	Deduction
    by Trustee from accumulated income following disbursement made to Company under Section 1	 	$	250.00	 
	Paying
    Agent services as required pursuant to Section 1(i)	 	Billed
    to Company upon delivery of service pursuant to Section 1(i)	 	 	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 Celest Gonzalez

 

Re:Trust
Account No.       Termination Letter

 

Ladies
and Gentlemen:

 

Pursuant
to Section 1(i) of the Investment Management Trust Agreement between Tortoise Acquisition Corp. (the “Company”)
and Continental Stock Transfer & Trust Company (the “Trustee”), dated as of [         ], 2019 (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
forty-eight (48) 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 on [         ], 20[   ], and to transfer the proceeds into the trust operating account 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) [an affidavit] [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
stockholders, 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., Goldman Sachs & Co. LLC and UBS Securities 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.

 

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,
	 	 
	 	Tortoise
    Acquisition Corp.
	 	 
	 	By:	           
	 	Name:
	 	Title:

 

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

 

    Exhibit A

     

    

 

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 No.      Termination Letter

 

Ladies
and Gentlemen:

 

Pursuant
to Section 1(i) of the Investment Management Trust Agreement between Tortoise Acquisition Corp. (the “Company”)
and Continental Stock Transfer & Trust Company (the “Trustee”), dated as of [    ], 2019 (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 Certificate of Incorporation, 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 on            , 20    and to transfer the total proceeds into the
trust
checking
account
at
                       
to await distribution to the Public Stockholders. The Company has selected
           , 20    as the effective date for the
purpose of determining when the Public Stockholders 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 Stockholders in accordance with the terms of the Trust Agreement and the Amended and
Restated Certificate of Incorporation of 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, except to the extent otherwise provided in Section 1(j) of the Trust Agreement.

 

	 	Very
    truly yours,
	 	 
	 	Tortoise
    Acquisition Corp.
	 	 
	 	By:	           
	 	Name:
	 	Title:

 

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

 

    Exhibit B

     

    

 

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 No.         Tax Payment Withdrawal Instruction

 

Ladies
and Gentlemen:

 

Pursuant
to Section 1(j) of the Investment Management Trust Agreement between Tortoise Acquisition Corp. (the “Company”)
and Continental Stock Transfer & Trust Company (the “Trustee”), dated as of [      ], 2019 (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,
	 	 
	 	Tortoise
    Acquisition Corp.
	 	 
	 	By:	           
	 	Name:
	 	Title:

 

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

 

    Exhibit C

     

    

 

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 No.     Stockholder Redemption Withdrawal Instruction

 

Ladies
and Gentlemen:

 

Pursuant
to Section 1(k) of the Investment Management Trust Agreement between Tortoise Acquisition Corp. (the “Company”)
and Continental Stock Transfer & Trust Company (the “Trustee”), dated as of [     ], 2019 (the “Trust
Agreement”), the Company hereby requests that you deliver to the redeeming Public Stockholders 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 Stockholders who have properly elected to have their shares of Common Stock redeemed
by the Company in connection with a stockholder vote to approve an amendment to the Company’s amended and restated certificate
of incorporation that affects the substance or timing of the Company’s obligation to redeem one hundred percent (100%) of
its public shares of Common Stock if the Company has not consummated an initial Business Combination within such time as is described
in the Company’s amended and restated certificate of incorporation. 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 Stockholders in accordance with
your customary procedures.

 

	 	Very
    truly yours,
	 	 
	 	Tortoise
    Acquisition Corp.
	 	 
	 	By:	           
	 	Name:
	 	Title:

 

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

 

    Exhibit DExhibit
10.5

 

SECURITIES
PURCHASE AGREEMENT

 

November
7, 2018

 

This
Securities Purchase Agreement (this “Agreement”), effective as of November 7, 2018, is made and entered
into by and between Tortoise Acquisition Corp., a Delaware corporation (the “Company”), and Tortoise
Sponsor LLC, a Delaware limited liability company (the “Buyer”).

 

RECITALS:

 

WHEREAS,
the Buyer wishes to purchase from the Company an aggregate of 5,750,000 shares (the “Shares”) of the
Company’s Class B Common Stock (as defined below), and the Company wishes to sell the Shares to the Buyer, on the terms
and subject to the conditions set forth in this Agreement.

 

AGREEMENT:

 

NOW,
THEREFORE, in consideration of the premises, representations, warranties and the mutual covenants contained in this Agreement,
and for other good and valuable consideration, the receipt, sufficiency and adequacy of which are hereby acknowledged, the parties
hereto agree as follows:

 

Article I

DEFINITIONS

 

The
terms defined in this Article I shall have for all purposes of this Agreement the respective meanings set forth below:

 

“Agreement”
shall have the meaning set forth in the preamble to this Agreement.

 

“Buyer”
shall have the meaning set forth in the preamble to this Agreement.

 

“Class
A Common Stock” shall mean the Class A Common Stock, $0.0001 par value per share, of the Company.

 

“Class
B Common Stock” shall mean the Class B Common Stock, $0.0001 par value per share, of the Company. Pursuant
to the Company’s certificate of incorporation, as amended to the date hereof, shares of Class B Common Stock will automatically
convert into shares of Class A Common Stock on a one-for-one basis, subject to adjustment, upon the terms and conditions
set forth therein.

 

“Closing”
shall have the meaning set forth in Section 2.3 of this Agreement.

 

“Closing
Date” shall have the meaning set forth in Section 2.3 of this Agreement.

 

“Company”
shall have the meaning set forth in the preamble to this Agreement.

 

“Consent”
means any consent, approval, notification, waiver, or other similar action that is necessary or convenient.

 

“Governmental
Body” shall mean any legislature, agency, bureau, branch, department, division, commission, court, tribunal or other
similar recognized organization or body of any federal, state, county, municipal, local or foreign government or other similar
recognized organization or body exercising similar powers or authority.

 

“Law”
shall mean any law (statutory, common or otherwise), constitution, ordinance, rule, regulation, executive order or other similar
authority enacted, adopted, promulgated or applied by any Governmental Body.

 

    1

     

    

 

“Lien”
shall mean a mortgage, deed of trust, pledge, hypothecation, assignment, encumbrance, charge, restriction, lien (statutory or
otherwise, including, without limitation, any lien for taxes), security interest, preference, participation interest, priority
or security agreement or preferential arrangement of any kind or nature whatsoever, including, without limitation, any conditional
sale or other title retention agreement, any financing lease having substantially the same economic effect as any of the foregoing
and the filing of any document under the law of any applicable jurisdiction to evidence any of the foregoing, other than (i) statutory,
mechanics’ or other Liens incurred in the Company’s ordinary course of business or (ii) Liens for taxes incurred but
not yet due.

 

“Order”
shall mean an order, ruling, decision, award, judgment, injunction or other similar determination or finding by, before or under
the supervision of any Governmental Body or arbitrator.

 

“Permit”
shall mean a permit, license, certificate, waiver, notice or similar authorization.

 

“Purchase
Price” shall have the meaning set forth in Section 2.2 of this Agreement.

 

“SEC”
shall mean the United States Securities and Exchange Commission.

 

“Securities
Act” shall mean the United States Securities Act of 1933, as amended, or any successor federal statute, and the
applicable rules and regulations promulgated and in effect from time to time thereunder.

 

“Shares”
shall have the meaning set forth in the recitals to this Agreement. Unless the context otherwise requires, as used in this Agreement
“Shares” shall be deemed to include any shares of Class A Common Stock issued upon conversion of the shares of
Class B Common Stock comprising the Shares.

 

Article II

PURCHASE OF THE SHARES

 

Section 2.1Purchase
and Sale of the Shares. Subject to the terms and conditions hereof and in reliance upon the representations and warranties
of the parties contained or incorporated by reference herein, simultaneous with the execution hereof, the Company shall sell and
deliver to the Buyer, and the Buyer shall purchase from the Company, the Shares, in consideration of the payment of the Purchase
Price noted herein.

 

Section 2.2Purchase
Price. As payment in full for the Shares being purchased under this Agreement and against delivery of the certificates
therefor, simultaneous with the execution hereof, the Buyer shall pay $25,000 to the Company by wire transfer of immediately available
funds or by such other method as may be reasonably acceptable to the Company (the “Purchase Price”).

 

Section 2.3Closing.
The closing of the purchase and sale of the Shares (the “Closing”) shall be held on the date of this
Agreement (“Closing Date”) at the offices of Vinson & Elkins L.L.P., 1001 Fannin Street, Suite 2500,
Houston, Texas 77002, or such other place as may be agreed upon by the parties hereto.

 

Section 2.4Closing
Deliveries. All actions taken at the Closing shall be deemed to have been taken simultaneously.

 

(a)       Buyer
Deliveries. At the Closing the Buyer shall deliver to the Company the Purchase Price.

 

(b)       Company
Deliveries. At the Closing, or within a reasonable time after the Closing but in no event later than thirty (30) days
after the Closing, the Company shall deliver to the Buyer the certificates representing the Shares.

 

Section 2.5Further
Assurances. The parties hereto shall execute and deliver such additional documents and take such additional actions as
any party reasonably may deem to be practical and necessary in order to consummate the transactions contemplated by this Agreement.

 

    2

     

    

 

Section 2.6Legend.
Each certificate evidencing the Shares and each certificate issued in exchange for or upon the transfer of any Shares shall be
stamped or otherwise imprinted with a legend in substantially the following form:

 

“THE
SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES
LAWS OF ANY STATE OR OTHER JURISDICTION, AND MAY NOT BE TRANSFERRED IN VIOLATION OF SUCH ACT AND LAWS.”

 

“THE
SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO ADDITIONAL RESTRICTIONS ON TRANSFER SET FORTH IN THE LETTER AGREEMENT
BY AND BETWEEN THE COMPANY AND THE SPONSOR. COPIES OF SUCH AGREEMENT MAY BE OBTAINED FROM THE COMPANY AT THE COMPANY’S PRINCIPAL
PLACE OF BUSINESS WITHOUT CHARGE.”

 

Article III

REPRESENTATIONS AND WARRANTIES OF THE BUYER

 

The
Buyer represents and warrants that the statements contained in this Article III are correct and complete as of the
date of this Agreement.

 

Section 3.1Organization
and Good Standing. The Buyer is a limited liability company duly organized, validly existing, and in good standing under
the laws of the state of Delaware.

 

Section 3.2Power
and Authority; Enforceability. This Agreement constitutes the legal, valid, and binding obligation of the Buyer, enforceable
against the Buyer in accordance with its terms. The Buyer has full entity power and authority to execute and deliver this Agreement
and to perform its obligations hereunder. The Buyer has taken all actions necessary to authorize the execution and delivery of
this Agreement, the performance of its obligations hereunder and the consummation of the transactions contemplated hereby. This
Agreement has been duly authorized, executed and delivered by, and is enforceable against, the Buyer.

 

Section 3.3Investment
Representations.

 

(a)       The
Buyer is an “accredited investor” as defined in Rule 501 of Regulation D under the Securities Act.

 

(b)       The
Buyer has received, has thoroughly read, is familiar with and understands the contents of this Agreement.

 

(c)       The
Buyer hereby acknowledges that an investment in the Shares involves certain significant risks. The Buyer acknowledges that there
is a substantial risk that it will lose all or a portion of its investment and that it is financially capable of bearing the risk
of such investment for an indefinite period of time. The Buyer has no need for liquidity in its investment in the Shares for the
foreseeable future and is able to bear the risk of that investment for an indefinite period. The Buyer understands that there
presently is no public market for the Shares and none is anticipated to develop in the foreseeable future. The Buyer’s present
financial condition is such that the Buyer is under no present or contemplated future need to dispose of any portion of the Shares
subscribed for hereby to satisfy any existing or contemplated undertaking, need or indebtedness. The Buyer’s overall commitment
to investments which are not readily marketable is not disproportionate to its net worth and the investment in the Company will
not cause such overall commitment to become excessive.

 

(d)       The
Buyer acknowledges that the Shares have not been and will not be registered under the Securities Act, or any state securities
act, and are being sold on the basis of exemptions from registration under the Securities Act and applicable state securities
acts, except those state securities acts that require registration of the Shares thereunder. Reliance on such exemptions, where
applicable, is predicated in part on the accuracy of the Buyer’s representations and warranties set forth herein. The Buyer
acknowledges and hereby agrees that the Shares will not be transferable under any circumstances unless the Buyer either registers
the Shares in accordance with federal and state securities laws or finds and complies with an available exemption under such laws.
Accordingly, the Buyer hereby acknowledges that there can be no assurance that it will be able to liquidate its investment in
the Company.

 

    3

     

    

 

(e)       There
are substantial risk factors pertaining to an investment in the Company. The Buyer acknowledges that it has read the information
set forth above regarding certain of such risks and is familiar with the nature and scope of all such risks, including, without
limitation, risks arising from the fact that the Company is an entity with limited operating history and financial resources;
and the Buyer is fully able to bear the economic risks of such investment for an indefinite period, and can afford a complete
loss thereof.

 

(f)       The
Buyer has been given the opportunity to (i) ask questions of and receive answers from the Company and its designated representatives
concerning the terms and conditions of the offering, the Company and the business and financial condition of the Company and (ii)
obtain any additional information that the Company possesses or can acquire without unreasonable effort or expense that is necessary
to assist the Buyer in evaluating the advisability of the purchase of the Shares and an investment in the Company. The Buyer further
represents and warrants that, prior to signing this Agreement, it has asked such questions, received such answers and obtained
such information as it has deemed necessary or advisable to evaluate the merits and risks of the purchase of the Shares and an
investment in the Company. The Buyer is not relying on any oral representation made by any person as to the Company or its operations,
financial condition or prospects.

 

(g)       The
Buyer understands that no federal, state or other governmental authority has made any recommendation, findings or determination
relating to the merits of an investment in the Company.

 

Article IV

REPRESENTATIONS AND WARRANTIES OF THE COMPANY

 

Section 4.1Organization
and Good Standing. The Company is a corporation duly organized, validly existing, and in good standing under the laws
of the State of Delaware.

 

Section 4.2Power
and Authority; Enforceability. This Agreement constitutes the legal, valid, and binding obligation of the Company, enforceable
against the Company in accordance with its terms. The Company has full power and authority to execute and deliver this Agreement
and to perform its obligations hereunder. The Company has taken all actions necessary to authorize the execution and delivery
of this Agreement, the performance of its obligations hereunder, and the consummation of the transactions contemplated hereby.
This Agreement has been duly authorized, executed, and delivered by, and is enforceable against, the Company.

 

Section 4.3No
Violation; Necessary Approvals. Neither the execution and delivery of this Agreement by the Company, nor the consummation
or performance by the Company of any of transactions contemplated hereby, will: (a) with or without notice or lapse of time, constitute,
create or result in a breach or violation of, default under, loss of benefit or right under or acceleration of performance of
any obligation required under any Law, Order, contract or Permit to which the Company is a party or by which it is bound or any
of its assets are subject, or any provision of the Company’s organizational documents as in effect on the Closing Date,
(b) result in the imposition of any lien, claim or encumbrance upon any assets owned by the Company; (c) require any Consent under
any contract or organizational document to which the Company is a party or by which it is bound; (d) require any Permit under
any Law or Order other than (i) required filings, if any, with the SEC and (ii) notifications or other filings with state or federal
regulatory agencies after the Closing that are necessary or convenient and do not require approval of the agency as a condition
to the validity of the transactions contemplated hereunder; or (e) trigger any rights of first refusal, preferential purchase
or similar rights with respect to any of the Shares.

 

Section 4.4Authorization
of the Shares. The Shares have been duly authorized and, when issued in accordance with this Agreement, the Shares will
be duly and validly issued, fully paid and non-assessable shares of Class B Common Stock and will be free and clear of all
Liens and claims, other than restrictions on transfer imposed by the Securities Act and applicable state securities laws.

 

    4

     

    

 

Article V

MISCELLANEOUS

 

Section 5.1Entire
Agreement. This Agreement, together with the certificates, documents, instruments and writings that are delivered pursuant
hereto, constitutes the entire agreement and understanding of the parties hereto in respect of its subject matter and supersedes
all prior understandings, agreements, or representations by or among the parties hereto, written or oral, to the extent they relate
in any way to the subject matter hereof or the transactions contemplated hereby.

 

Section 5.2Successors.
All of the terms, agreements, covenants, representations, warranties, and conditions of this Agreement are binding upon, and inure
to the benefit of and are enforceable by, the parties hereto and their respective successors.

 

Section 5.3Assignments.
Except as otherwise provided herein, no party hereto may assign either this Agreement or any of its rights, interests, or obligations
hereunder without the prior written approval of the other party. Any purported assignment in violation of this Section 5.3
shall be void and ineffectual and shall not operate to transfer or assign any interest or title to the purported assignee.

 

Section 5.4Waiver
of Jury Trial. THE PARTIES HERETO EACH HEREBY AGREE TO WAIVE THE RESPECTIVE RIGHTS TO JURY TRIAL OF ANY DISPUTE BASED
UPON OR ARISING OUT OF THIS AGREEMENT OR ANY OTHER AGREEMENTS RELATING HERETO OR ANY DEALINGS AMONG THEM RELATING TO THE TRANSACTIONS.
THE SCOPE OF THIS WAIVER IS INTENDED TO BE ALL ENCOMPASSING OF ANY AND ALL ACTIONS THAT MAY BE FILED IN ANY COURT AND THAT RELATE
TO THE SUBJECT MATTER OF THE TRANSACTIONS, INCLUDING, CONTRACT CLAIMS, TORT CLAIMS, BREACH OF DUTY CLAIMS, AND ALL OTHER COMMON
LAW AND STATUTORY CLAIMS. THE PARTIES HERETO EACH ACKNOWLEDGE THAT THIS WAIVER IS A MATERIAL INDUCEMENT TO ENTER INTO A BUSINESS
RELATIONSHIP AND THAT THEY WILL CONTINUE TO RELY ON THE WAIVER IN THEIR RELATED FUTURE DEALINGS. EACH PARTY HERETO FURTHER REPRESENTS
AND WARRANTS THAT IT HAS REVIEWED THIS WAIVER WITH ITS LEGAL COUNSEL, AND THAT EACH KNOWINGLY AND VOLUNTARILY WAIVES ITS JURY
TRIAL RIGHTS FOLLOWING CONSULTATION WITH LEGAL COUNSEL. NOTWITHSTANDING ANYTHING TO THE CONTRARY HEREIN, THIS WAIVER IS IRREVOCABLE,
MEANING THAT IT MAY NOT BE MODIFIED ORALLY OR IN WRITING, AND THE WAIVER WILL APPLY TO ANY AMENDMENTS, RENEWALS, SUPPLEMENTS OR
MODIFICATIONS TO THIS AGREEMENT OR TO ANY OTHER DOCUMENTS OR AGREEMENTS RELATING HERETO. IN THE EVENT OF AN ACTION, THIS AGREEMENT
MAY BE FILED AS A WRITTEN CONSENT TO TRIAL BY A COURT.

 

Section 5.5Counterparts.
This Agreement may be executed in two or more counterparts, each of which will be deemed an original but all of which together
will constitute one and the same instrument.

 

Section 5.6Headings.
The article and section headings contained in this Agreement are inserted for convenience only and will not affect in any way
the meaning or interpretation of this Agreement.

 

Section 5.7Governing
Law. This Agreement, the entire relationship of the parties hereto, and any litigation between the parties (whether grounded
in contract, tort, statute, law or equity) shall be governed by, construed in accordance with, and interpreted pursuant to the
laws of the State of Delaware, without giving effect to its choice of laws principles.

 

Section 5.8Amendments.
This Agreement may not be amended, modified or waived as to any particular provision, except by a written instrument executed
by the parties hereto.

 

Section 5.9Severability.
The provisions of this Agreement will be deemed severable and the invalidity or unenforceability of any provision will not affect
the validity or enforceability of the other provisions hereof; provided that if any provision of this Agreement, as applied to
any party hereto or to any circumstance, is adjudged by a Governmental Body, arbitrator, or mediator not to be enforceable in
accordance with its terms, the parties hereto agree that the Governmental Body, arbitrator, or mediator making such determination
will have the power to modify the provision in a manner consistent with its objectives such that it is enforceable, and/or to
delete specific words or phrases, and in its reduced form, such provision will then be enforceable and will be enforced.

 

    5

     

    

 

Section 5.10Expenses.
Except as otherwise expressly provided in this Agreement, each party hereto will bear its own costs and expenses incurred in connection
with the preparation, execution and performance of this Agreement and the consummation of the transactions contemplated hereby,
including all fees and expenses of agents, representatives, financial advisors, legal counsel and accountants.

 

Section 5.11Construction.
The parties hereto have participated jointly in the negotiation and drafting of this Agreement. If an ambiguity or question of
intent or interpretation arises, this Agreement will be construed as if drafted jointly by the parties hereto and no presumption
or burden of proof will arise favoring or disfavoring any party hereto because of the authorship of any provision of this Agreement.
Any reference to any federal, state, local, or foreign Law will be deemed also to refer to Law as amended and all rules and regulations
promulgated thereunder, unless the context requires otherwise. The words “include,” “includes,” and “including”
will be deemed to be followed by “without limitation.” Pronouns in masculine, feminine, and neuter genders will be
construed to include any other gender, and words in the singular form will be construed to include the plural and vice versa,
unless the context otherwise requires. The words “this Agreement,” “herein,” “hereof,” “hereby,”
“hereunder,” and words of similar import refer to this Agreement as a whole and not to any particular subdivision
unless expressly so limited. The parties hereto intend that each representation, warranty, and covenant contained herein will
have independent significance. If any party hereto has breached any representation, warranty, or covenant contained herein in
any respect, the fact that there exists another representation, warranty or covenant relating to the same subject matter (regardless
of the relative levels of specificity) which such party hereto has not breached will not detract from or mitigate the fact that
such party hereto is in breach of the first representation, warranty, or covenant.

 

Section 5.12Waiver.
No waiver by any party hereto of any default, misrepresentation, or breach of warranty or covenant hereunder, whether intentional
or not, may be deemed to extend to any prior or subsequent default, misrepresentation, or breach of warranty or covenant hereunder
or affect in any way any rights arising because of any prior or subsequent occurrence.

 

[signature
page follows]

 

    6

     

    

 

IN
WITNESS WHEREOF, the undersigned have executed this Agreement to be effective as of the date first set forth above.

 

	 	COMPANY:
	 	 	 
	 	TORTOISE ACQUISITION CORP.
	 	 	 
	 	By:	/s/ Vincent T. Cubbage
	 	Name:	Vincent T. Cubbage
	 	Title:	President and Chief Executive Officer
	 	 	 
	 	BUYER:
	 	 	 
	 	TORTOISE SPONSOR LLC
	 	 	 
	 	By:	/s/ Connie Savage
	 	Name: 	Connie Savage
	 	Title:	Chief Financial Officer, Secretary and Treasurer

 

[Signature Page to the Securities Purchase Agreement]

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