Document:

Exhibit 10.1

 

PROMISSORY NOTE

 

	Not to Exceed $300,000	November 7, 2018

 

FOR VALUE RECEIVED,
the undersigned Tortoise Acquisition Corp., a Delaware corporation (“Maker” or the “Company”),
whose address is 11550 Ash Street, Suite 300, Leawood, KS 66211, hereby unconditionally promises to pay to the order of Tortoise
Sponsor LLC, a Delaware limited liability company (“Payee”), at Payee’s office at 11550 Ash Street,
Suite 300, Leawood, KS 66211 (or such other address specified by Payee to Maker), the sum of THREE HUNDRED THOUSAND DOLLARS ($300,000)
or such lesser amount as shall have been advanced by Payee to Maker and shall remain unpaid under this note (this “Note”),
in legal and lawful money of the United States of America.

 

Payee may make advances
to Maker from time to time under this Note; provided, however, that notwithstanding anything to the contrary herein, at no time
shall the aggregate of all advances and re-advances outstanding under this Note exceed $300,000.

 

This is a non-interest
bearing Note.

 

The entire unpaid principal
balance of this Note shall be due and payable upon the earlier of (x) the date that is 180 days following the date hereof and (y)
the consummation of a public offering of the Company’s securities.

 

If payment of this
Note or any installment of this Note is not made when due, the entire indebtedness hereunder, at the option of Payee, shall immediately
become due and payable, and Payee shall be entitled to pursue any or all remedies to which Payee is entitled hereunder, or at law
or in equity.

 

This Note may be prepaid,
in whole or in part, without penalty. This Note may not be changed, amended or modified except in a writing expressly intended
for such purpose and executed by the party against whom enforcement of the change, amendment or modification is sought. The loan
evidenced by this Note is made solely for business purposes.

 

THIS NOTE IS BEING
EXECUTED AND DELIVERED, AND IS INTENDED TO BE PERFORMED, IN THE STATE OF NEW YORK. EXCEPT TO THE EXTENT THAT THE LAWS OF THE UNITED
STATES MAY APPLY TO THE TERMS HEREOF, THE SUBSTANTIVE LAWS OF THE STATE OF NEW YORK SHALL GOVERN THE VALIDITY, CONSTRUCTION, ENFORCEMENT
AND INTERPRETATION OF THIS NOTE. IN THE EVENT OF A DISPUTE INVOLVING THIS NOTE OR ANY OTHER INSTRUMENTS EXECUTED IN CONNECTION
HEREWITH, THE UNDERSIGNED PARTIES IRREVOCABLY AGREE THAT VENUE FOR SUCH DISPUTE SHALL LIE IN ANY COURT OF COMPETENT JURISDICTION
IN THE STATE OF NEW YORK.

 

Service of any notice
by Maker to Payee or by Payee to Maker, shall be mailed, postage prepaid by certified United States mail, return receipt requested,
at the address for such party set forth in this Note, or at such subsequent address provided to the other party hereto in the manner
set forth in this paragraph for all notices. Any such notice shall be deemed given three (3) days after deposit thereof in an official
depository under the care and custody of the United States Postal Service.

 

Should the indebtedness
represented by this Note or any part thereof be collected at law or in equity or through any bankruptcy, receivership, probate
or other court proceedings or if this Note is placed in the hands of attorneys for collection after default, the undersigned and
all endorsers, guarantors and sureties of this Note jointly and severally agree to pay to the holder of this Note, in addition
to the principal and interest due and payable hereon, reasonable attorneys’ and collection fees.

 

     

     

    

 

The undersigned and
all endorsers, guarantors and sureties of this Note and all other persons liable or to become liable on this Note severally waive
presentment for payment, demand, notice of demand and of dishonor and nonpayment of this Note, notice of intention to accelerate
the maturity of this Note, notice of acceleration, protest and notice of protest, diligence in collecting, and the bringing of
suit against any other party, and agree to all renewals, extensions, modifications, partial payments, releases or substitutions
of security, in whole or in part, with or without notice, before or after maturity.

 

The undersigned hereby
expressly and unconditionally waives, in connection with any suit, action or proceeding brought by the payee on this Note, any
and every right it may have to (i) injunctive relief, (ii) a trial by jury, (iii) interpose any counterclaim therein and (iv) have
the same consolidated with any other or separate suit, action or proceeding. Nothing herein contained shall prevent or prohibit
the undersigned from instituting or maintaining a separate action against payee with respect to any asserted claim.

 

Any provision contained
in this Note which is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent
of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibitions or unenforceability
in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

 

This Note represents
the final agreement between the parties and may not be contradicted by evidence of prior, contemporaneous or subsequent oral agreements
of the parties.

 

[signature page follows]

 

    	 	2	 

     

    

 

EXECUTED AND AGREED
as of the date first above written.

 

	 	TORTOISE ACQUISITION CORP.,
	 	a Delaware corporation
	 	 	 
	 	By:	/s/ Vincent T. Cubbage
	 	Name:	Vincent T. Cubbage
	 	Title:	President and Chief Executive Officer

 

    	 	3Exhibit
10.2

[●],
2019

 

Tortoise
Acquisition Corp.

452 Fifth Avenue, 14th Floor

New York, NY 10018

 

		Re:	Initial
Public Offering

 

Ladies
and Gentlemen:

 

This
letter (this “Letter Agreement”) is being delivered to you in accordance with the Underwriting Agreement
(the “Underwriting Agreement”) entered into by and among Tortoise Acquisition Corp., a Delaware corporation
(the “Company”), and Barclays Capital Inc., Goldman Sachs & Co. LLC and UBS Securities LLC, as representatives
(the “Representatives”) of the several underwriters (the “Underwriters”),
relating to an underwritten initial public offering (the “Public Offering”), of [               ]
of the Company’s units (including up to [               ]
units which may be purchased to cover over-allotments, if any) (the “Units”), each comprised of one
share of the Company’s Class A common stock, par value $0.0001 per share (the “Class A Common Stock”),
and one-half of one redeemable warrant (each whole warrant, a “Warrant”). Each Warrant entitles the
holder thereof to purchase one share of the Class A Common Stock at a price of $11.50 per share, subject to adjustment. The Units
shall be sold in the Public Offering pursuant to the registration statement on Form S-1 No. 333-           and prospectus (the “Prospectus”)
filed by the Company with the Securities and Exchange Commission (the “Commission”) and the Company
shall apply to have the Units listed on the New York Stock Exchange. Certain capitalized terms used herein are defined in paragraph 11
hereof.

 

In
order to induce the Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the Public Offering
and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, Tortoise Sponsor
LLC, a Delaware limited liability company (the “Sponsor”), Atlas Point Energy Infrastructure Fund, LLC,
a Delaware limited liability company (“Atlas Point Fund”), and each of the undersigned individuals,
each of whom is a member of the Company’s board of directors and/or management team (each an “Insider”
and, collectively, the “Insiders”), hereby agree with the Company as follows:

 

1. The
Sponsor, Atlas Point Fund and each Insider agree that if the Company seeks stockholder approval of a proposed Business Combination,
then in connection with such proposed Business Combination, it, he or she shall vote all Founder Shares and any shares acquired
by it, him or her in the Public Offering or the secondary public market in favor of such proposed Business Combination.

 

2. The
Sponsor and each Insider hereby agree that in the event that the Company fails to consummate a Business Combination within 24
months from the closing of the Public Offering, or such later period approved by the Company’s stockholders in accordance
with the Company’s amended and restated certificate of incorporation, the Sponsor and each Insider shall take all reasonable
steps to cause the Company to (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible
but not more than 10 business days thereafter, subject to lawfully available funds therefor, redeem 100% of the Class A Common
Stock sold as part of the Units in the Public Offering (the “Offering Shares”), at a per-share price,
payable in cash, equal to the aggregate amount then on deposit 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 to pay dissolution expenses), divided by
the number of then outstanding Offering Shares, which redemption will completely extinguish Public Stockholders’ rights
as stockholders (including the right to receive further liquidation distributions, if any), subject to applicable law and (iii)
as promptly as reasonably possible following such redemption, subject to the approval of the Company’s remaining stockholders
and the Company’s board of directors, dissolve and liquidate, subject in each case to the Company’s obligations under
Delaware law to provide for claims of creditors and other requirements of applicable law. The Sponsor and the Insiders agree to
not propose any 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 100% of the Offering Shares if the Company does not complete a Business
Combination within 24 months from the closing of the Public Offering, unless the Company provides its Public Stockholders with
the opportunity to redeem their Offering Shares upon approval of any such amendment at a per share price, payable in cash, equal
to the aggregate amount then on deposit in the Trust Account including interest earned on the funds held in the Trust Account
and not previously released to the Company to pay its franchise and income taxes, divided by the number of then outstanding Offering
Shares.

 

    1

     

    

 

The
Sponsor, Atlas Point Fund and each Insider acknowledges that it, he or she has no right, title, interest or claim of any kind
in or to any monies held in the Trust Account or any other asset of the Company as a result of any liquidation of the Company
with respect to the Founder Shares. The Sponsor, Atlas Point Fund and each Insider hereby further waives, with respect to any
shares of the Common Stock held by it, him or her, any redemption rights it, he or she may have in connection with the consummation
of a Business Combination, including, without limitation, any such rights available in the context of a stockholder vote to approve
such Business Combination or in the context of a tender offer made by the Company to purchase shares of the Common Stock and in
connection with a stockholder vote to amend the Company’s amended and restated certificate of incorporation in a manner
that would affect the substance or timing of the Company’s obligation to redeem 100% of the Company’s public shares
if the Company has not consummated a Business Combination within 24 months from the closing of the Public Offering (although the
Sponsor, Atlas Point Fund, the Insiders and their respective affiliates shall be entitled to redemption and liquidation rights
with respect to any shares of the Common Stock (other than the Founder Shares) it or they hold if the Company fails to consummate
a Business Combination within 24 months from the date of the closing of the Public Offering or such later date as may be specified
in an amendment to the Company’s amended and restated certificate of incorporation).

 

3. During the period commencing on
the effective date of the Underwriting Agreement and ending 180 days after such date, the undersigned shall not, without the prior
written consent of Barclays Capital Inc. and Goldman Sachs & Co. LLC, (i) sell, offer to sell, contract or agree to sell, hypothecate,
pledge, grant any option to purchase or otherwise dispose of or agree to dispose of, directly or indirectly, or establish or increase
a put equivalent position or liquidate or decrease a call equivalent position within the meaning of Section 16 of the Securities
Exchange Act of 1934, as amended, and the rules and regulations of the Commission promulgated thereunder, any Units, shares of
Class A Common Stock, shares of the Company’s Class B common stock, par value $0.0001 per share (the “Class B
Common Stock” and, together with the Class A Common Stock, the “Common Stock”), Warrants
or any securities convertible into, or exercisable, or exchangeable for, shares of Common Stock owned by him, her or it; provided,
however, that the foregoing shall not apply to transfers to the Sponsor by either Atlas Point Fund or the Insiders, (ii) enter
into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership
of any Units, shares of Common Stock, Founder Shares, Warrants or any securities convertible into, or exercisable, or exchangeable
for, shares of Class A Common Stock owned by him, her or it, whether any such transaction is to be settled by delivery of such
securities, in cash or otherwise or (iii) publicly announce any intention to effect any transaction specified in clause (i) or
(ii). If the undersigned is an officer or director of the Company, the undersigned further agrees that the forgoing restrictions
shall be equally applicable to any issuer-directed Units that the undersigned may purchase in the Public Offering. Each of the
Insiders, Atlas Point Fund and the Sponsor acknowledges and agrees that, prior to the effective date of any release or waiver of
the restrictions set forth in this paragraph 3 or paragraph 7 below, the Company shall announce the impending release
or waiver by press release through a major news service at least two business days before the effective date of the release or
waiver. Any release or waiver granted shall only be effective two business days after the publication date of such press release.
The provisions of this paragraph will not apply if (A) the release or waiver is effected solely to permit a transfer of securities
that is not for consideration and (B) the transferee has agreed in writing to be bound by the same terms described in this Letter
Agreement to the extent and for the duration that such terms remain in effect at the time of the transfer.

 

4. In
the event of the liquidation of the Trust Account, the Sponsor (which for purposes of clarification shall not extend to any officer,
member or manager of the Sponsor) agrees to indemnify and hold harmless the Company against any and all loss, liability, claim,
damage and expense whatsoever (including, but not limited to, any and all legal or other expenses reasonably incurred in investigating,
preparing or defending against any litigation, whether pending or threatened, or any claim whatsoever) to which the Company may
become subject as a result of any claim by (i) any third party (other than the Company’s independent public accountants)
for services rendered or products sold to the Company or (ii) a prospective target business with which the Company has entered
into a letter of intent, confidentiality or other similar agreement or business combination agreement (a “Target”);
provided, however, that such indemnification of the Company by the Sponsor shall apply only to the extent necessary to
ensure that such claims by a third party for services rendered (other than the Company’s independent public accountants)
or products sold to the Company or a Target do not reduce the amount of funds in the Trust Account to below the lesser of (A)
$10.00 per share of the Offering Shares and (B) the actual amount per share of the Offering Shares held in the Trust Account due
to reductions in the value of the trust assets as of the date of the liquidation of the Trust Account, in each case including
interest earned on the funds held in the Trust Account and not previously released to the Company to pay its franchise and income
taxes, less franchise and income taxes payable, except as to any claims by a third party or Target that executed an agreement
waiving claims against and all rights to seek access to the Trust Account whether or not such agreement is enforceable. In the
event that any such executed waiver is deemed to be unenforceable against such third party, the Sponsor shall not be responsible
for any liability as a result of any such third party claims. Notwithstanding any of the foregoing, such indemnification of the
Company by the Sponsor shall not apply as to any claims under the Company’s obligation to indemnify the Underwriters against
certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”).
The Sponsor shall have the right to defend against any such claim with counsel of its choice reasonably satisfactory to the Company
if, within 15 days following written receipt of notice of the claim to the Sponsor, the Sponsor notifies the Company in writing
that it shall undertake such defense.

 

    2

     

    

 

5. To
the extent that the Underwriters do not exercise their over-allotment option to purchase an additional [               ]
Units (as described in the Prospectus), the Sponsor agrees, upon the expiration or waiver of such option, to forfeit, for cancellation
at no cost, a number of Founder Shares equal to [               ]
multiplied by a fraction, (i) the numerator of which is [              ]
minus the number of Units purchased by the Underwriters upon the exercise of their over-allotment option, and (ii) the denominator
of which is [               ].
The forfeiture will be adjusted to the extent that the over-allotment option is not exercised in full by the Underwriters so that
the Founder Shares will represent 20.0% of the Company’s issued and outstanding shares of Common Stock after the Public
Offering. The Sponsor further agrees that to the extent that (a) the size of the Public Offering is increased or decreased and
(b) the Sponsor has either purchased or sold shares of Common Stock or an adjustment to the number of Founder Shares has been
effected by way of a stock split, stock dividend, reverse stock split, contribution back to capital or otherwise, in each case
in connection with such increase or decrease in the size of the Public Offering, then (A) the references to [               ]
in the numerator and denominator of the formula in the first sentence of this paragraph shall be changed to a number equal to
15.0% of the number of shares of Class A Common Stock included in the Units issued in the Public Offering and (B) the reference
to [               ]
in the formula set forth in the first sentence of this paragraph shall be adjusted to such number of Founder Shares that the Sponsor
would have to collectively return to the Company in order for all holders of Founder Shares to hold an aggregate of 20.0% of the
Company’s issued and outstanding shares of Common Stock after the Public Offering.

 

6.(a) The
Sponsor and each Insider hereby agree not to participate in the formation of, or become an officer or director of, any other blank
check company until the Company has entered into a definitive agreement with respect to a Business Combination or the Company
has failed to complete a Business Combination within 24 months after the closing of the Public Offering.

 

(b) Each
of the Sponsor, Atlas Point Fund and each Insider hereby agrees and acknowledges that: (i) each of the Underwriters and the Company
would be irreparably injured in the event of a breach by such Sponsor or Insider of his, her or its obligations under paragraphs 1,
2, 3, 4, 5, 6(a), 7(a), 7(b), 7(d) and 9 or Atlas Point Fund of its obligations under paragraphs 1, 2, 3 and 7(a) of this Letter
Agreement, (ii) monetary damages may not be an adequate remedy for such breach and (iii) the non-breaching party shall be entitled
to injunctive relief, in addition to any other remedy that such party may have in law or in equity, in the event of such breach.

 

7.(a) Subject
to the exceptions set forth herein, the Sponsor, Atlas Point Fund and each Insider agree not to transfer, assign or sell any Founder
Shares held by it, him or her until the earlier of (i) one year after the date of the consummation of a Business Combination and
(ii) the earlier to occur of, subsequent to a Business Combination, (A) the first date on which the last reported sale price of
the Common Stock equals or exceeds $12.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations
and the like) for any 20 trading days within any 30 trading-day period commencing at least 150 days after the consummation of
a Business Combination and (B) the date on which the Company consummates a subsequent liquidation, merger, stock exchange or other
similar transaction which results in all of the Company’s stockholders having the right to exchange their shares of Common
Stock for cash, securities or other property (the “Lock-up”).

 

    3

     

    

 

(b) Subject
to the exceptions set forth herein, the Sponsor and each Insider agree not to transfer, assign or sell any Private Placement Warrants
or Class A Common Stock underlying such warrants held by it, him or her, until 30 days after the completion of a Business Combination.

 

(c) Notwithstanding
the provisions set forth in paragraphs 7(a) and (b), transfers of the Founder Shares, Private Placement Warrants and shares
of Class A Common Stock issued or issuable upon the exercise or conversion of the Private Placement Warrants or the Founder Shares
and that are held by the Sponsor, Atlas Point Fund, any Insider or any of their permitted transferees, as applicable, (that have
complied with any applicable requirements of this paragraph 7(c)) are permitted (i) in the case of the Sponsor, any Insider
or any of their permitted transferees, to the Company’s officers or directors, any affiliates or family members of any of
the Company’s officers or directors, the Sponsor, any members of the Sponsor or their affiliates or any affiliates of the
Sponsor; (ii) in the case of Atlas Point Fund or any of its permitted transferees, to the Company, the Sponsor or any affiliates
of Atlas Point Fund; (iii) in the case of an individual, by gift to members of the individual’s immediate family or to a
trust, the beneficiary of which is a member of one of the individual’s immediate family, an affiliate of such person or
to a charitable organization; (iv) in the case of an individual, by virtue of laws of descent and distribution upon death of the
individual; (v) in the case of an individual, pursuant to a qualified domestic relations order; (vi) by virtue of the laws of
the state of Delaware, the Sponsor’s operating agreement upon dissolution of the Sponsor or Atlas Point Fund’s operating
agreement upon dissolution of Atlas Point Fund; (vii) by private sales or transfers made in connection with the consummation of
a Business Combination at prices no greater than the price at which the securities were originally purchased; (viii) in the event
of the Company’s liquidation prior to the completion of a Business Combination; or (ix) in the event of completion of a
liquidation, merger, stock exchange or other similar transaction which results in all of the Company’s stockholders having
the right to exchange their shares of Common Stock for cash, securities or other property subsequent to the completion of a Business
Combination; provided, however, that in the case of clauses (i) through (vii), these permitted transferees must enter into
a written agreement agreeing to be bound by these transfer restrictions.

 

(d) The
Sponsor and the Insiders acknowledge and agree that if, in order to consummate any Business Combination, the holders of Founder
Shares (other than Atlas Point Fund) or Private Placement Warrants are required to contribute back to the capital of the Company
a portion of any such securities to be cancelled by the Company or transfer any such securities to third parties, the Sponsor
and the Insiders will contribute back to the capital of the Company or transfer to such third parties, at no cost, a proportionate
number of Founder Shares or Private Placement Warrants, as applicable, pro rata with the other holders of Founder Shares (other
than Atlas Point Fund) or Private Placement Warrants, as applicable.

 

8. Each
Insider’s biographical information furnished to the Company and the Representatives that is included in the Prospectus is
true and accurate in all respects and does not omit any material information with respect to such Insider’s background and
contains all of the information required to be disclosed pursuant to Item 401 of Regulation S-K, promulgated under the Securities
Act. Each Insider’s questionnaire furnished to the Company and the Representatives including any such information that is
included in the Prospectus is true and accurate in all respects. Each Insider represents and warrants that: such Insider is not
subject to or a respondent in any legal action for, any injunction, cease-and-desist order or order or stipulation to desist or
refrain from any act or practice relating to the offering of securities in any jurisdiction; such Insider has never been convicted
of, or pleaded guilty to, any crime (i) involving fraud, (ii) relating to any financial transaction or handling of funds of another
person or (iii) pertaining to any dealings in any securities and such Insider is not currently a defendant in any such criminal
proceeding; and none of the Sponsor, Atlas Point Fund or any such Insider has ever been suspended or expelled from membership
in any securities or commodities exchange or association or had a securities or commodities license or registration denied, suspended
or revoked.

 

9. Except
as disclosed in the Prospectus, none of the Sponsor, Atlas Point Fund, any affiliate of the Sponsor or Atlas Point Fund, or any
director or officer of the Company, shall receive any finder’s fee, reimbursement, consulting fee, monies in respect of
any repayment of a loan or other compensation prior to, or in connection with any services rendered in order to effectuate the
consummation of the Company’s initial Business Combination (regardless of the type of transaction that it is). However,
such persons may receive the following payments, none of which will be made from the proceeds held in the Trust Account prior
to the completion of the initial Business Combination: repayment of a loan of up to $300,000 made to the Company by the Sponsor,
pursuant to a Promissory Note dated November 7, 2018; payment of an aggregate of $10,000 per month, to the Sponsor, for office
space, utilities, secretarial support and administrative services, pursuant to an Administrative Services Agreement, dated [    ],
2019; reimbursement for any reasonable out-of-pocket expenses related to identifying, investigating, negotiating and consummating
an initial Business Combination; and repayment of loans, if any, and on such terms as to be determined by the Company from time
to time, made by the Sponsor or an affiliate of the Sponsor or certain of the Company’s officers and directors to finance
transaction costs in connection with an intended initial Business Combination, provided, that, if the Company does not
consummate an initial Business Combination, a portion of the working capital held outside the Trust Account may be used by the
Company to repay such loaned amounts so long as no proceeds from the Trust Account are used for such repayment. Up to $1,500,000
of such loans may be convertible into warrants at a price of $1.00 per warrant at the option of the lender. Such warrants shall
be identical to the Private Placement Warrants, including as to exercise price, exercisability and exercise period.

 

    4

     

    

 

10. The
Sponsor, Atlas Point Fund and each Insider has full right and power, without violating any agreement to which it, he or she is
bound (including, without limitation, any non-competition or non-solicitation agreement with any employer or former employer),
to enter into this Letter Agreement and, as applicable, to serve as a director on the board of directors of the Company and each
Insider hereby consents to being named in the Prospectus as an officer and/or director of the Company, as applicable.

 

11. As
used herein, (i) “Business Combination” shall mean a merger, capital stock exchange, asset acquisition,
stock purchase, reorganization or similar business combination, involving the Company and one or more businesses; (ii) “Founder
Shares” shall mean the shares of the Class B Common Stock held by the Sponsor, Atlas Point Fund, the Company’s
independent directors and any other holder prior to the consummation of the Public Offering; (iii) “Private Placement
Warrants” shall mean the warrants to purchase [               ]
shares of Class A Common Stock (or [              ]
shares of Class A Common Stock if the Underwriters’ over-allotment option in connection with the Public Offering is exercised
in full), that the Sponsor has agreed to purchase for an aggregate purchase price of approximately $[               ]
(or approximately $[               ]
if the Underwriters’ over-allotment option in connection with the Public Offering is exercised in full), or $1.00 per warrant,
in a private placement that shall occur simultaneously with the consummation of the Public Offering; (iv) “Public
Stockholders” shall mean the holders of securities issued in the Public Offering; (v) “Trust Account”
shall mean the trust fund into which a portion of the net proceeds of the Public Offering shall be deposited; and (vi) “Forward
Purchase Agreement” shall mean that certain Amended and Restated Forward Purchase Agreement, dated as of February 6, 2019, among the Company, the Sponsor and Atlas Point Fund.

 

12. This
Letter Agreement constitutes the entire agreement and understanding of the parties hereto in respect of the subject matter hereof
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. This Letter Agreement may
not be changed, amended, modified or waived (other than to correct a typographical error) as to any particular provision, except
by a written instrument executed by all parties hereto. Each of the parties hereto hereby acknowledges and agrees that
each of Barclays Capital Inc. and Goldman Sachs & Co. LLC, on behalf of the Underwriters, is a third party beneficiary of
this Agreement.

 

13. No
party hereto may assign either this Letter Agreement or any of its rights, interests or obligations hereunder without the prior
written consent of the other parties. Any purported assignment in violation of this paragraph shall be void and ineffectual and
shall not operate to transfer or assign any interest or title to the purported assignee. This Letter Agreement shall be binding
on the Sponsor, Atlas Point Fund, each Insider and each of their respective successors, heirs and assigns and permitted transferees.

 

14. This
Letter 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.
The parties hereto (i) all agree that any action, proceeding, claim or dispute arising out of, or relating in any way to, this
Letter Agreement shall be brought and enforced in the courts of the State of New York located in the City and County of New York,
Borough of Manhattan, and irrevocably submit to such jurisdiction and venue, which jurisdiction and venue shall be exclusive and
(ii) waive any objection to such exclusive jurisdiction and venue or that such courts represent an inconvenient forum.

 

15. Any
notice, consent or request to be given in connection with any of the terms or provisions of this Letter 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 facsimile transmission.

 

16. This
Letter Agreement shall terminate on the earlier of (i) the expiration of the Lock-up or (ii) the liquidation of the Company; provided,
however, that this Letter Agreement shall earlier terminate in the event that the Public Offering is not consummated and closed
by June 30, 2019, provided further that paragraph 4 of this Letter Agreement shall survive such liquidation.

 

[signature
page follows]

 

    5

     

    

 

	 	Sincerely,
	 	 
	 	TORTOISE SPONSOR LLC
	 	 
	 	By:	         
	 	Name:	 
	 	Title:	 

 

	 	 
	 	[●]
	 	 
	 	 
	 	[●]
	 	 
	 	 
	 	[●]
	 	 
	 	 
	 	[●]

 

	 	ATLAS POINT ENERGY INFRASTRUCTURE FUND, LLC
	 	 	 
	 	By:	                        
	 	Name:	 
	 	Title:	 

 

Acknowledged
and Agreed:

 

TORTOISE
ACQUISITION CORP.

 

	By:	    	 
	Name:	 	 
	Title:	 	 

 

[Signature Page to Letter Agreement]

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