FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

ECP ControlCo, LLC		 2. Issuer Name and Ticker or Trading Symbol

Sunnova Energy International Inc. [ NOVA ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                    __X__ 10% Owner
_____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle)

40 BEECHWOOD ROAD		 3. Date of Earliest Transaction (MM/DD/YYYY)

8/18/2020
(Street)

SUMMIT, NJ 07901
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
 6. Individual or Joint/Group Filing (Check Applicable Line)

___ Form filed by One Reporting Person
_ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 8/18/2020  S  7229760 D$24.125 24911664 I See footnotes (1)(2)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)		2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)		8. Price of Derivative Security
(Instr. 5)		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
(1) Consists of: 343,053 shares of Common Stock held by Energy Capital Partners III, LP, 11,548,364 shares of Common Stock held by Energy Capital Partners III-A, LP, 1,394,653 shares of Common Stock held by Energy Capital Partners III-B, LP, 4,774,273 shares of Common Stock held by Energy Capital Partners III-C, LP, 5,892,272 shares of Common Stock held by Energy Capital Partners III-D, LP (collectively, the "ECP Funds") and 959,049 shares of Common Stock held by Energy Capital Partners III (Sunnova Co-Invest), LP ("ECP Sunnova").
(2) ECP Control Co, LLC ("ECP Control Co") is the managing member of Energy Capital Partners III, LLC ("ECP GP"), which is (i) the general partner of Energy Capital Partners GP III, LP ("ECP Fund GP") and (ii) the managing member of Energy Capital Partners GP III Co-Investment (Sunnova), LLC ("ECP Sunnova GP"). ECP Fund GP is the general partner of each of the ECP Funds and ECP Sunnova GP is the general partner of ECP Sunnova. Douglas Kimmelman, Andrew Singer, Peter Labbat, Tyler Reeder and Rahman D'Argenio are the managing members of ECP ControlCo and share the power to vote and dispose of the securities beneficially owned by ECP ControlCo. As such, each of the foregoing entities and individuals may be deemed to share beneficial ownership of the Common Stock reported herein, but each disclaims any such beneficial ownership except to the extent of their pecuniary interest therein.
Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
ECP ControlCo, LLC
40 BEECHWOOD ROAD
SUMMIT, NJ 07901
X

ENERGY CAPITAL PARTNERS III, LLC
40 BEECHWOOD ROAD
SUMMIT, NJ 07901
X

Energy Capital Partners GP III, LP
40 BEECHWOOD ROAD
SUMMIT, NJ 07901
X

ENERGY CAPITAL PARTNERS III, LP
40 BEECHWOOD ROAD
SUMMIT, NJ 07901
X

ENERGY CAPITAL PARTNERS III-A, LP
40 BEECHWOOD ROAD
SUMMIT, NJ 07901
X

ENERGY CAPITAL PARTNERS III-B, LP
40 BEECHWOOD ROAD
SUMMIT, NJ 07901
X

ENERGY CAPITAL PARTNERS III-C, LP
40 BEECHWOOD ROAD
SUMMIT, NJ 07901
X

ENERGY CAPITAL PARTNERS III-D, LP
40 BEECHWOOD ROAD
SUMMIT, NJ 07901
X

Energy Capital Partners GP III Co-Investment (Sunnova), LLC
40 BEECHWOOD ROAD
SUMMIT, NJ 07901
X

Energy Capital Partners III (Sunnova Co-Invest), LP
40 BEECHWOOD ROAD
SUMMIT, NJ 07901
X
Signatures
ECP ControlCo, LLC, By: /s/ Rahman D'Argenio, Managing Member8/19/2020
**Signature of Reporting PersonDate

Energy Capital Partners III, LLC, By: ECP ControlCo, LLC, its managing member, By: /s/ Rahman D'Argenio, Managing Member8/19/2020
**Signature of Reporting PersonDate

Energy Capital Partners GP III, LP, By: Energy Capital Partners III, LLC, its general partner, By: ECP ControlCo, LLC, its managing member, By: /s/ Rahman D'Argenio, Managing Member8/19/2020
**Signature of Reporting PersonDate

Energy Capital Partners III, LP, By: Energy Capital Partners GP III, LP, its general partner, By: Energy Capital Partners III, LLC, its general partner, By: ECP ControlCo, LLC, its managing member, By: /s/ Rahman D'Argenio, Managing Member8/19/2020
**Signature of Reporting PersonDate

Energy Capital Partners III-A, LP, By: Energy Capital Partners GP III, LP, its general partner, By: Energy Capital Partners III, LLC, its general partner, By: ECP ControlCo, LLC, its managing member, By: /s/ Rahman D'Argenio, Managing Member8/19/2020
**Signature of Reporting PersonDate

Energy Capital Partners III-B, LP, By: Energy Capital Partners GP III, LP, its general partner, By: Energy Capital Partners III, LLC, its general partner, By: ECP ControlCo, LLC, its managing member, By: /s/ Rahman D'Argenio, Managing Member8/19/2020
**Signature of Reporting PersonDate

Energy Capital Partners III-C, LP, By: Energy Capital Partners GP III, LP, its general partner, By: Energy Capital Partners III, LLC, its general partner, By: ECP ControlCo, LLC, its managing member, By: /s/ Rahman D'Argenio, Managing Member8/19/2020
**Signature of Reporting PersonDate

Energy Capital Partners III-D, LP, By: Energy Capital Partners GP III, LP, its general partner, By: Energy Capital Partners III, LLC, its general partner, By: ECP ControlCo, LLC, its managing member, By: /s/ Rahman D'Argenio, Managing Member8/19/2020
**Signature of Reporting PersonDate

Energy Capital Partners GP III Co-Investment (Sunnova), LLC, By: Energy Capital Partners III, LLC, its managing member, By: ECP ControlCo, LLC, its managing member, By: /s/ Rahman D'Argenio, Managing Member8/19/2020
**Signature of Reporting PersonDate

Energy Capital Partners III (Sunnova Co-Invest), LP, By: Energy Capital Partners GP III Co-Investment (Sunnova), LLC, By: Energy Capital Partners III, LLC, By: ECP ControlCo, LLC, its managing member, By: /s/ Rahman D'Argenio, Managing Member8/19/2020
**Signature of Reporting PersonDate
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