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Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Checkbox not checked   Rule 13d-1(b)
Checkbox checked   Rule 13d-1(c)
Checkbox not checked   Rule 13d-1(d)






SCHEDULE 13G




Comment for Type of Reporting Person:  Limited Liability Company


SCHEDULE 13G




Comment for Type of Reporting Person:  Limited Liability Company


SCHEDULE 13G




Comment for Type of Reporting Person:  Limited Liability Company


SCHEDULE 13G




Comment for Type of Reporting Person:  Limited Liability Company


SCHEDULE 13G




Comment for Type of Reporting Person:  Limited Liability Company


SCHEDULE 13G




Comment for Type of Reporting Person:  Limited Liability Company


SCHEDULE 13G




Comment for Type of Reporting Person:  Limited Liability Company


SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G



 
ECP ControlCo, LLC
 
Signature:By /s/ Jennifer Gray
Name/Title:Jennifer Gray, General Counsel
Date:01/14/2026
 
Energy Capital Partners III, LLC
 
Signature:By: ECP ControlCo, LLC, its managing member, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, General Counsel
Date:01/14/2026
 
Energy Capital Partners IV, LLC
 
Signature:By: ECP ControlCo, LLC, its managing member, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, General Counsel
Date:01/14/2026
 
ECP Calpine GP, LLC
 
Signature:By: ECP ControlCo, LLC, its managing member, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, General Counsel
Date:01/14/2026
 
ECP III Volt Holdings, LLC
 
Signature:By: Energy Capital Partners III, LP, Energy Capital Partners GP III, LP, Energy Capital Partners III, LLC, ECP ControlCo, LLC, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, General Counsel
Date:01/14/2026
 
ECP III-A Volt Holdings, LLC
 
Signature:By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, Executive Vice President & General Counsel
Date:01/14/2026
 
ECP III-B Volt Holdings, LLC
 
Signature:By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, Executive Vice President & General Counsel
Date:01/14/2026
 
ECP III-C Volt Holdings, LP
 
Signature:By: ECP III Volt Holdings GP, LLC, its general partner, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, Executive Vice President & General Counsel
Date:01/14/2026
 
ECP III-D Volt Holdings, LP
 
Signature:By: ECP III Volt Holdings GP, LLC, its general partner, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, Executive Vice President & General Counsel
Date:01/14/2026
 
ECP Checkerspot Holdings, LP
 
Signature:By: Volt Parent GP, LLC, Energy Capital Partners III, LLC, ECP ControlCo, LLC, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, General Counsel
Date:01/14/2026
 
ECP IV-A Volt Holdings, LP
 
Signature:By: ECP IV Volt Holdings GP, LLC, its general partner, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, Executive Vice President & General Counsel
Date:01/14/2026
 
ECP IV-B Volt Holdings, LP
 
Signature:By: ECP IV Volt Holdings GP, LLC, its general partner, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, Executive Vice President & General Counsel
Date:01/14/2026
 
ECP IV-C Volt Holdings, LP
 
Signature:By: ECP IV Volt Holdings GP, LLC, its general partner, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, Executive Vice President & General Counsel
Date:01/14/2026
 
ECP IV-D Volt Holdings, LP
 
Signature:By: ECP IV Volt Holdings GP, LLC, its general partner, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, Executive Vice President & General Counsel
Date:01/14/2026
 
ECP Calpine Fund GP, LP
 
Signature:By: ECP Calpine GP, LLC, its general partner, By: ECP ControlCo, LLC, its managing member, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, General Counsel
Date:01/14/2026
 
ECP Calpine Continuation Fund, LP
 
Signature:By: ECP Calpine Fund GP, LP, By: ECP Calpine GP, LLC, By: ECP ControlCo, LLC, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, General Counsel
Date:01/14/2026
 
ECP Calpine Rollover Fund, LP
 
Signature:By: ECP Calpine Fund GP, LP, By: ECP Calpine GP, LLC, By: ECP ControlCo, LLC, By: /s/ Jennifer Gray
Name/Title:Jennifer Gray, General Counsel
Date:01/14/2026
Exhibit Information

Exhibit 99: Joint Filing Agreement.