Exhibit 99

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that they are jointly filing this statement on Schedule 13G. Each of them is responsible for the timely filing of such statement 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.

IN WITNESS WHEREOF, the undersigned hereby execute this Joint Filing Agreement as of June 23, 2026.

	ECP ControlCo, LLC

	By:	/s/ Jennifer Gray
	Name:	Jennifer Gray
	Title:	General Counsel

	ECP V, LLC

	By:	ECP ControlCo, LLC, its managing member

	By:	/s/ Jennifer Gray
	Name:	Jennifer Gray
	Title:	General Counsel

	ECP V GP Cornerstone DRE, LP

	By:	Cornerstone DRE GP, LLC, its General Partner

	By:	/s/ Jennifer Gray
	Name:	Jennifer Gray
	Title:	Executive Vice President

	ECP V Cornerstone DRE, LP

	By:	Cornerstone DRE GP, LLC, its General Partner

	By:	/s/ Jennifer Gray
	Name:	Jennifer Gray
	Title:	Executive Vice President

	ECP V-B Cornerstone DRE, LP

	By:	Cornerstone DRE GP, LLC, its General Partner

	By:	/s/ Jennifer Gray
	Name:	Jennifer Gray
	Title:	Executive Vice President

	ECP V-C Cornerstone DRE, LP

	By:	Cornerstone DRE GP, LLC, its General Partner

	By:	/s/ Jennifer Gray
	Name:	Jennifer Gray
	Title:	Executive Vice President

	ECP V-D Cornerstone DRE, LP

	By:	Cornerstone DRE GP, LLC, its General Partner

	By:	/s/ Jennifer Gray
	Name:	Jennifer Gray
	Title:	Executive Vice President

Talen Energy Corp SCHEDULE 13G