Exhibit A

JOINT FILING AGREEMENT

Pursuant to and in accordance with the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder (the “Exchange Act”) the undersigned hereby agree to the joint filing on behalf of each of them of any filing required by such party under Section 13 of the Exchange Act or any rule or regulation thereunder (including any amendment, restatement, supplement, and/or exhibit thereto) with respect to securities of Array Technologies, Inc., a Delaware corporation, and further agree to the filing, furnishing, and/or incorporation by reference of this Agreement as an exhibit thereto. Each of them is responsible for the timely filing of such filings and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate. This Agreement shall remain in full force and effect until revoked by any party hereto in a signed writing provided to each other party hereto, and then only with respect to such revoking party. This Agreement may be executed in any number of counterparts all of which taken together shall constitute one and the same instrument.

Dated: August 20, 2021

BCP HELIOS AGGREGATOR L.P.
By: BCP 8/BEP 3 Holdings Manager L.L.C., its general partner
By:	/s/ Tabea Hsi
Name:	Tabea Hsi
Title:	Authorized Signatory
BCP 8/BEP 3 HOLDINGS MANAGER L.L.C.
By:	/s/ Tabea Hsi
Name:	Tabea Hsi
Title:	Authorized Signatory
BLACKSTONE MANAGEMENT ASSOCIATES VIII L.P.
By: BMA VIII L.L.C., its general partner
By:	/s/ Tabea Hsi
Name:	Tabea Hsi
Title:	Authorized Signatory
BMA VIII L.L.C.
By:	/s/ Tabea Hsi
Name:	Tabea Hsi
Title:	Authorized Signatory

BLACKSTONE ENERGY MANAGEMENT ASSOCIATES III L.P.
By: Blackstone EMA III L.L.C., its general partner
By:	/s/ Tabea Hsi
Name:	Tabea Hsi
Title:	Authorized Signatory
Blackstone EMA III L.L.C.
By:	/s/ Tabea Hsi
Name:	Tabea Hsi
Title:	Authorized Signatory
BEFIP III – ESC HELIOS HOLDCO L.P.
By: Blackstone Energy Family Investment Partnership III – ESC L.P., its general partner
By: BEP III Side-by-Side GP L.L.C., its general partner
By:	/s/ Tabea Hsi
Name:	Tabea Hsi
Title:	Senior Managing Director
Blackstone Energy Family Investment Partnership III – ESC L.P.
By: BEP III Side-by-Side GP L.L.C., its general partner
By:	/s/ Tabea Hsi
Name:	Tabea Hsi
Title:	Senior Managing Director
BEP III SIDE-BY-SIDE GP L.L.C.
By:	/s/ Tabea Hsi
Name:	Tabea Hsi
Title:	Senior Managing Director

BLACKSTONE HOLDINGS II L.P.
By: Blackstone Holdings I/II GP L.L.C., its general partner
By:	/s/ Tabea Hsi
Name:	Tabea Hsi
Title:	Senior Managing Director
BLACKSTONE HOLDINGS I/II GP L.L.C.
By:	/s/ Tabea Hsi
Name:	Tabea Hsi
Title:	Senior Managing Director
BLACKSTONE INC.
By:	/s/ Tabea Hsi
Name:	Tabea Hsi
Title:	Senior Managing Director
BLACKSTONE GROUP MANAGEMENT L.L.C.
By:	/s/ Tabea Hsi
Name:	Tabea Hsi
Title:	Senior Managing Director
/s/ Stephen A. Schwarzman
Stephen A. Schwarzman

[Array Technologies, Inc. – Joint Filing Agreement]