Document:

EX-10.37

 Exhibit 10.37 

[Date] 
 TO: 

FROM: 
 RE: Option Grant 

Sunnova Energy International Inc.. (the “Company”) hereby grants to you, the right and option to purchase, on the terms and conditions hereinafter
set forth in Appendix A (the “Terms and Conditions”), all or any part of an aggregate of                      shares of the Common Stock,
par value $         per share, of the Company at the exercise price of                      per share (the
“Options”), subject to adjustment as provided in Section 14 of the Sunnova Energy International Inc. 2019 Long-Term Incentive Plan (the “Plan”), effective as of
                    , 201         (the “Date of Grant”), exercisable from time to time as set forth
in the attached Terms and Conditions, subject to the Terms and Conditions during a period expiring at the close of business on the ten (10) year anniversary of the Date of Grant (the “Expiration Date”). 

The grant of Options is governed by the terms and conditions of the Plan, any rules and regulations adopted by the Compensation Committee of the Board of
Directors of the Company, and the Terms and Conditions which form a part of this award letter to you (the “Award Letter”). 

[Name of signing officer] 

 Appendix A 

SUNNOVA ENERGY INTERNATIONAL INC. 

2019 LONG-TERM INCENTIVE PLAN 

TERMS AND CONDITIONS OF 

OPTION GRANT 
 The options (the
“Options”) granted to you on the “Date of Grant” set forth in the award letter to you (the “Award Letter”) by Sunnova Energy International Inc. (the “Company”) are subject to the 2019 Long-Term Incentive Plan
(the “Plan”), these Terms and Conditions and any rules and regulations adopted by the Committee. Terms used herein and not otherwise defined shall have the meaning set forth in the Plan and the Award Letter. 

 

	1.	 Vesting. The Options are non-exercisable during the three year
period following the Date of Grant. Thereafter, the Options vest and become exercisable on and after the third anniversary of the Date of Grant. If your employment with the Company, its subsidiaries or affiliates (collectively, the “Company
Group”) terminates for any other reason besides Retirement, all unvested and nonexercisable Options shall terminate and be forfeited. Notwithstanding the foregoing, if your employment with the Company Group is terminated by reason of your
Retirement between the first and second anniversaries of the Date of Grant, one third of the Options (rounded down to the nearest whole share) will vest and become exercisable; if your employment with the Company Group is terminated by reason of
your Retirement between the second and third anniversaries of the Date of Grant, two thirds of the Options (rounded down to the nearest whole share) will vest and become exercisable. 

In no event may the Options granted hereby be exercised to any extent after the Expiration Date. Any Options remaining outstanding and
unexercised immediately prior to the Expiration Date shall be automatically exercised immediately prior to the Expiration Date via a broker-assisted cashless exercise or net exercise directly with the Company. 

To the extent such rights shall not have been exercised and to the extent the Options were exercisable at the time of your termination of
employment due to Retirement, death or Disability, you (or your personal representative in the case of death) shall be entitled to exercise all or any part of any Options which were vested but unexercised as of the date of your termination of
employment due to Retirement, death or Disability, as applicable, during the remaining term of such Options. If your employment with the Company Group terminates for any other reason besides Retirement, death or Disability (and not for Cause), you
shall be entitled to exercise all or any part of any Options which were vested but unexercised as of termination of employment for a period of up to three (3) months from 

  
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such date of termination. For purposes of this award of Options, (i) you are considered to be “Disabled” or have a “Disability” on the date that you become eligible for
long-term disability benefits pursuant to the Company’s long-term disability plan, and (ii) “Retirement” means your voluntary termination of employment with the Company Group on or after the date you attain [65] years of age. Upon a
termination of employment for Cause, all Options shall cease to be exercisable as of the date of termination of employment. 
 For this
purpose, “Cause” means (i) your willful failure to substantially perform the material duties of your position (other than any such failure resulting from your Disability); (ii) your willful failure to carry out, or comply with, in any
material respect any material lawful directive of the Board of Directors of the Company; (iii) your commission at any time of any act or omission that results in, or may reasonably be expected to result in, a conviction, plea of no contest or
plea of nolo contendere for [a violation of federal securities laws or regulations,] any felony or crime involving moral turpitude, excluding driving or traffic-related felonies; (iv) your indictment for any driving or traffic-related
felony where the effect of such indictment is materially adverse to the Company or its affiliates or their respective operations, reputations or conditions; (v) your unlawful use (including being under the influence) or possession of illegal
drugs on the Company’s premises or while performing the duties and responsibilities of your position; (vi) your commission at any time of any act of fraud, embezzlement, misappropriation, material misconduct, conversion of assets of the
Company, or breach of fiduciary duty against the Company (or any predecessor thereto or successor thereof); or (vii) your material breach of any employment agreement or equity award agreement between you and the Company or any other material
agreements with the Company (including, without limitation, any breach of the restrictive covenants of any such agreement); and which, in the case of clauses (i), (ii) and (vii), continues beyond thirty (30) days after the Company has provided
you written notice of such failure or breach (to the extent that, in the reasonable judgment of the Board, such failure or breach can be cured by you). 
  

	2.	 Change in Control. Notwithstanding the provisions of Section 1 of these Terms and Conditions, in
the event of a Change in Control, all Options granted hereby will become automatically fully vested and immediately exercisable. 

  

	3.	 Exercise of Options. To exercise the Options, you must contact the Plan’s designated broker dealer
specifying the number of shares to be purchased and tendering payment in cash or by certified or cashier’s check payable to the order of the Company of the full purchase price of the shares to be purchased. Pursuant to procedures established by
the Company, payment may also be made with irrevocable instructions to the broker dealer to sell a sufficient portion of the shares and deliver the sale proceeds to the Company in 

  
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satisfaction of the exercise price. The Company may also establish a procedure for the exercise of the Options via net exercise directly with the Company whereby you may direct the Company to
withhold a number of shares of Common Stock otherwise deliverable upon the exercise of the Options sufficient to satisfy the exercise price of the Options. Payments may also be made in Common Stock or a combination of cash and Common Stock, as
specified in the Plan. 

  

	4.	 No Right to Continued Employment. The grant of the Options shall not create any right to remain in the
employ of the Company Group. The Company Group retains the right to terminate your employment at will, for due cause or otherwise. Your employment shall be deemed to continue during any leave of absence which has been authorized by the Company
Group. 

  

	5.	 Satisfaction of Conditions. No shares of Common Stock issuable upon the exercise of the Options shall be
issued and delivered if the offering of the Common Stock covered by the Options, or the exercise of the Options violates or is not in compliance with all applicable requirements of law and the Securities and Exchange Commission pertaining to the
issuance and sale of such shares, and all applicable listing requirements of any national securities exchange on which shares of the same class are then listed. 

 

	6.	 Transferability. No Option shall be transferable otherwise than by the will or by laws of descent and
distribution, and all Options shall be exercisable, during your lifetime only by you. 

  

	7.	 Other Plans. Nothing herein contained shall affect your right to participate in and receive benefits
under and in accordance with the then current provisions of any other plan or program of the Company Group. 

  

	8.	 Rights as Shareholders. Neither you nor any other person legally entitled to exercise the Options shall
be entitled to any of the rights or privileges of a shareholder of the Company in respect of any shares issuable upon any exercise of the Options unless such shares shall have been actually issued and delivered to your account.

  

	9.	 Plan Governs. The Options and the Award Letter are subject to all of the terms and conditions of the
Plan, except that no amendment to the Plan shall adversely affect your rights under the Award Letter. All the terms and conditions of the Plan, as may be amended from time to time, and any rules, guidelines and procedures which may from time to time
be established pursuant to the Plan, are hereby incorporated into the Award Letter. In the event of a discrepancy between the Award Letter and the Plan, the Plan shall govern. 

  
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	10.	 Withholding. Upon an exercise of the Options hereby granted, the Company Group shall withhold an
appropriate number of shares of Common Stock, having a Fair Market Value determined in accordance with the Plan, equal to the amount necessary to satisfy the minimum federal, state and local tax withholding obligation with respect to the Options
exercised (or withholding of shares may be allowed up to the maximum tax rate applicable to you). In lieu of withholding of shares of Common Stock, tax withholding may be satisfied by a cash payment to the Company or by such other method as the
Committee determines may be appropriate to satisfy all obligations for withholding of such taxes, including through the delivery of proceeds of a broker-assisted sale of a portion of the shares to be acquired upon exercise. 

 

	11.	 Governing Law. The Plan and the Award Letter shall be governed by, and construed in accordance with, the
laws of the State of Delaware, without regard to conflicts of laws. The courts in Harris County, Texas shall be the exclusive venue for any dispute regarding the Plan or the Award Letter. 

  
 4EX-10.38

 Exhibit 10.38 

[Date] 
 TO: 

FROM: 
  

	RE:	 Restricted Stock Unit Award for Non-Employee Director

 Sunnova Energy International Inc. (the “Company”) hereby awards to you, effective as of
                    , 201         (the “Date of Grant”),
                 restricted stock units (“Restricted Stock Units”) evidencing the right to receive an equivalent number of shares of Common Stock, par value
$             per share, of the Company, subject to adjustment as provided in Section 14 of the Sunnova Energy International Inc. 2019 Long-Term Incentive Plan (the “Plan”).

 Except as otherwise provided in Section 2 of the Terms and Conditions of Non-Employee Director Restricted
Stock Unit Award, attached hereto as Appendix A (the “Terms and Conditions”), the Restricted Stock Units will vest on the one year anniversary of the Date of Grant; provided you remain a director of the Company throughout the one year
period following the Date of Grant. 
 The award of Restricted Stock Units is governed by the terms and conditions of the Plan, any rules and regulations
adopted by the Compensation Committee of the Board of Directors of the Company, and the Terms and Conditions which form a part of this award letter to you (the “Award Letter”). 

[Name of signing officer] 

 Appendix A 

SUNNOVA ENERGY INTERNATIONAL INC. 

2019 LONG-TERM INCENTIVE PLAN 

TERMS AND CONDITIONS OF 

NON-EMPLOYEE DIRECTOR RESTRICTED STOCK UNIT AWARD 

The restricted stock units (the “Restricted Stock Units”) awarded to you on the “Date of Grant” set forth in the award letter to you (the
“Award Letter”) by Sunnova Energy International Inc. (the “Company”) are subject to the 2019 Long-Term Incentive Plan (the “Plan”), these Terms and Conditions and any rules and regulations adopted by the Committee.
Terms used herein and not otherwise defined shall have the meaning set forth in the Plan and the Award Letter. 
  

	1.	 Vesting/Forfeiture. Except as otherwise accelerated pursuant to Section 2 below, the Restricted
Stock Units shall vest on the one year anniversary of the Date of Grant (the “Restriction Period”). If your service as a director of the Company terminates for any reason, the unvested Restricted Stock Units shall be automatically
forfeited on the date of your termination of service; provided, however, that if the next annual meeting of shareholders occurs before the end of the Restriction Period and you do not resign before such meeting but you do not stand for reelection as
a director, any outstanding unvested Restricted Stock Units shall not be forfeited and shall vest at the end of the Restriction Period. 

  

	2.	 Change in Control. Notwithstanding the provisions of Section 1 of these Terms and Conditions, in
the event of a Change in Control, the Restricted Stock Units shall automatically vest and the Restriction Period shall terminate. 

  

	3.	 Settlement and Delivery of Common Stock. Settlement of Restricted Stock Units shall be made no later
than 15 days after the termination of the Restriction Period. Notwithstanding the foregoing, the Company shall not be obligated to issue any shares of Common Stock if counsel to the Company determines that such sale or delivery would violate any
applicable law or any rule or regulation of any governmental authority or any rule or regulation of, or agreement of the Company with, any securities exchange or association upon which the Common Stock is listed or quoted. The Company shall in no
event be obligated to take any affirmative action in order to cause the issuance of shares of Common Stock to comply with any such law, rule, regulation or agreement. 

  
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	4.	 No Rights as a Stockholder; Dividends. You shall not be entitled to any of the rights or privileges of a
shareholder of the Company in respect of any shares of Common Stock unless and until the Restricted Stock Units have been settled by the issuance of Common Stock to you. You shall not be entitled to receive any cash dividends payable with respect to
the Common Stock during the Restriction Period; however, to the extent that the Restricted Stock Units vest, you shall have the right to receive a cash Dividend Equivalent payment with respect to the Restricted Stock Units for the period beginning
on the Date of Grant and ending on the date the shares of Common Stock are issued to you in settlement of the Restricted Stock Units, which will be paid to you at the same time as the shares of Common Stock are issued to you in settlement of the
Restricted Stock Units. 

  

	5.	 Transferability. You may not sell, transfer, pledge, exchange, hypothecate, or otherwise dispose of the
Restricted Stock Units during the Restriction Period. 

  

	6.	 Adjustment. If, from time to time during the Restriction Period, there is any capital adjustment
affecting the outstanding Common Stock as a class without the Company’s receipt of consideration, the unvested Restricted Stock Units shall be adjusted in accordance with the provisions of Section 14 of the Plan. 

 

	7.	 Plan Governs. The Restricted Stock Units and the Award Letter are subject to all of the terms and
conditions of the Plan, except that no amendment to the Plan shall adversely affect your rights under the Award Letter. All the terms and conditions of the Plan, as may be amended from time to time, and any rules, guidelines and procedures which may
from time to time be established pursuant to the Plan are hereby incorporated into the Award Letter. In the event of a discrepancy between the Award Letter and the Plan, the Plan shall govern. 

 

	8.	 Withholding. Upon settlement of the Restricted Stock Units, the market value of the shares on the date
of settlement will be included with all other compensation paid during the year for services performed and reported on Internal Revenue Service Form 1099. You will be responsible for payment of all taxes assessable on the Restricted Stock Unit
Award. 

  

	9.	 Code Section 409A; No Guarantee of Tax Consequences. The award of Restricted Stock
Units is intended to be (i) exempt from Section 409A of the Code (“Section 409A”) by compliance with the short-term deferral exemption as specified in Treas. Reg. §
1.409A-1(b)(4); or (ii) in compliance with Section 409A, and the provisions of the Award Letter will be administered, interpreted and construed accordingly. Notwithstanding the provisions of
Section 2 of these Terms and Conditions, in the event of a Change of Control that does not meet the requirements of Treas. Reg. §1.409A-3(i)(5), any amounts that would otherwise be payable hereunder
as nonqualified deferred compensation within the meaning of Section 409A shall be fully vested but shall be settled in accordance with the provisions of Section 1 of these Terms and Conditions or, if earlier, on your separation

  
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from service. To the extent required to comply with Section 409A, you shall be considered to have terminated service with the Company when you incur a “separation from service”
with the Company within the meaning of Section 409A(a)(2)(A)(i) of the Code. The Company makes no commitment or guarantee to you that any federal or state tax treatment will apply or be available to any person eligible for benefits under the
Award Letter. 

  

	10.	 Governing Law. The Plan and the Award Letter shall be governed by, and construed in accordance with, the
laws of the State of Delaware, without regard to conflicts of laws. The courts in Harris County, Texas shall be the exclusive venue for any dispute regarding the Plan or the Award Letter. 

  
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