Blackstone Holdings III SC 13D FIRSTENERGY / Blackstone Holdings III ownership change

Exhibit 1

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 FirstEnergy Corp., an Ohio 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: December 23, 2021

BIP Securities II-B L.P.
By:	BIP Holdings Manager L.L.C., its general partner
By:	/s/ Christopher Placca
Name:	Christopher Placca
Title:	Managing Director
BIP Holdings Manager L.L.C.
By:	/s/ Christopher Placca
Name:	Christopher Placca
Title:	Managing Director
Blackstone Infrastructure Associates L.P.
By:	BIA GP L.P., its general partner
By:	BIA GP L.L.C., its general partner
By:	/s/ Christopher Placca
Name:	Christopher Placca
Title:	Managing Director
BIA GP L.P.
By:	BIA GP L.L.C., its general partner
By:	/s/ Christopher Placca
Name:	Christopher Placca
Title:	Managing Director

BIA GP L.L.C.
By:	/s/ Christopher Placca
Name:	Christopher Placca
Title:	Managing Director
BLACKSTONE HOLDINGS III L.P.
By: Blackstone Holdings III GP L.P., its general partner
By: Blackstone Holdings III GP Management L.L.C., its general partner
By:	/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director
BLACKSTONE HOLDINGS III GP L.P.
By: Blackstone Holdings III GP Management L.L.C., its general partner
By:	/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director
BLACKSTONE HOLDINGS III GP MANAGEMENT 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