Exhibit 10.2


 


Execution Version


 


INVESTMENT MANAGEMENT TRUST AGREEMENT


 


This Investment Management
Trust Agreement (this “Agreement”) is made effective as of February 27, 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. 333-229537 (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, $225,000,000 of the gross proceeds of the Offering and sale of the Private Placement Warrants (as
defined in the Underwriting Agreement) (or $258,800,000 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 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 $7,875,000, or $9,056,250 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
J.P. Morgan Chase Bank, N.A. 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;


 






     


     


    

 


(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 $7,875,000.


 


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, New York 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


 






    	 	6	 



     


    

 


(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:  	/s/ Francis E. Wolf, Jr.
	 	Name:	Francis E. Wolf, Jr.
	 	Title:	Vice President


 


[Signature Page to Investment Management
Trust Agreement]


 






     


     


    

 





	 	Tortoise Acquisition Corp.
	 	 
	 	By:	/s/ Vincent T. Cubbage
	 	Name:	Vincent T. Cubbage
	 	Title:	President and 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) 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 D