X0202 SCHEDULE 13G/A 0001707921 XXXXXXXX LIVE 1 Common Stock 06/30/2026 0001868275 Constellation Energy Corp 21037T109 1310 Point Street Baltimore MD 21231 Rule 13d-1(c) ECP ControlCo, LLC DE 0.00 14443227.00 0.00 14443227.00 14443227.00 N 4.0 OO Limited Liability Company Energy Capital Partners III, LLC DE 0.00 7232996.00 0.00 7232996.00 7232996.00 N 2.0 OO Limited Liability Company Energy Capital Partners IV, LLC DE 0.00 1466151.00 0.00 1466151.00 1466151.00 N 0.4 OO Limited Liability Company ECP Calpine GP, LLC DE 0.00 5744080.00 0.00 5744080.00 5744080.00 N 1.6 OO Limited Liability Company ECP III Volt Holdings, LLC DE 0.00 69149.00 0.00 69149.00 69149.00 N 0.02 OO Limited Liability Company ECP III-A Volt Holdings, LLC DE 0.00 2327800.00 0.00 2327800.00 2327800.00 N 0.7 OO Limited Liability Company ECP III-B Volt Holdings, LLC DE 0.00 281120.00 0.00 281120.00 281120.00 N 0.1 OO Limited Liability Company ECP III-C Volt Holdings, LP DE 0.00 962349.00 0.00 962349.00 962349.00 N 0.3 PN ECP III-D Volt Holdings, LP DE 0.00 1187704.00 0.00 1187704.00 1187704.00 N 0.3 PN ECP Checkerspot Holdings, LP DE 0.00 2404874.00 0.00 2404874.00 2404874.00 N 0.7 PN ECP IV-A Volt Holdings, LP DE 0.00 351240.00 0.00 351240.00 351240.00 N 0.1 PN ECP IV-B Volt Holdings, LP DE 0.00 58863.00 0.00 58863.00 58863.00 N 0.02 PN ECP IV-C Volt Holdings, LP DE 0.00 291129.00 0.00 291129.00 291129.00 N 0.1 PN ECP IV-D Volt Holdings, LP DE 0.00 764919.00 0.00 764919.00 764919.00 N 0.2 PN ECP Calpine Fund GP, LP DE 0.00 5744080.00 0.00 5744080.00 5744080.00 N 1.6 PN ECP Calpine Continuation Fund, LP DE 0.00 4702479.00 0.00 4702479.00 4702479.00 N 1.3 PN ECP Calpine Rollover Fund, LP DE 0.00 399812.00 0.00 399812.00 399812.00 N 0.1 PN Constellation Energy Corp 1310 Point Street, Baltimore, MD 21231 Each of the following is hereinafter individually referred to as a "Reporting Person" and collectively as the "Reporting Persons." This statement is filed on behalf of: ECP ControlCo, LLC Energy Capital Partners III, LLC Energy Capital Partners IV, LLC ECP Calpine GP, LLC ECP III Volt Holdings, LLC ECP III-A Volt Holdings, LLC ECP III-B Volt Holdings, LLC ECP III-C Volt Holdings, LP ECP III-D Volt Holdings, LP ECP Checkerspot Holdings, LP ECP IV-A Volt Holdings, LP ECP IV-B Volt Holdings, LP ECP IV-C Volt Holdings, LP ECP IV-D Volt Holdings, LP ECP Calpine Fund GP, LP ECP Calpine Continuation Fund, LP ECP Calpine Rollover Fund, LP The principal business office address for each of the Reporting Persons is c/o ECP ControlCo, LLC, 40 Beechwood Road, Summit, NJ 07901. Each of the Reporting Persons is organized under the laws of the State of Delaware. Y The information contained on the cover pages to this Schedule 13G is incorporated by reference into this Item 4. The ownership information presented herein represents beneficial ownership of Common Stock immediately after the Reporting Persons' sale of Common Stock pursuant to an underwriting agreement on June 2, 2026, based upon 357,102,017 shares of Common Stock outstanding as of June 2, 2026, as disclosed in the Issuer's Prospectus filed with the Securities and Exchange Commission on June 2, 2026. The number of securities reported as beneficially owned herein includes: 69,149 shares of Common Stock held by ECP III Volt Holdings, LLC; 2,327,800 shares of Common Stock held by ECP III-A Volt Holdings, LLC; 281,120 shares of Common Stock held by ECP III-B Volt Holdings, LLC; 962,349 shares of Common Stock held by ECP III-C Volt Holdings, LP; 1,187,704 shares of Common Stock held by ECP III-D Volt Holdings, LP; 2,404,874 shares of Common Stock held by ECP Checkerspot Holdings, LP; 351,240 shares of Common Stock held by ECP IV-A Volt Holdings, LP; 58,863 shares of Common Stock held by ECP IV-B Volt Holdings, LP; 291,129 shares of Common Stock held by ECP IV-C Volt Holdings, LP; 764,919 shares of Common Stock held by ECP IV-D Volt Holdings, LP; 641,789 shares of Common Stock held by ECP Calpine Fund GP, LP.; 4,702,479 shares of Common Stock held by ECP Calpine Continuation Fund, LP; and 399,812 shares of Common Stock held by ECP Calpine Rollover Fund, LP. ECP ControlCo, LLC is the managing member of each of Energy Capital Partners III, LLC, Energy Capital Partners IV, LLC and ECP Calpine GP, LLC. Energy Capital Partners III, LLC, as a result of its indirect control over each of the following entities, may be deemed to share beneficial ownership of the securities held of record by each of ECP III Volt Holdings, LLC, ECP III-A Volt Holdings, LLC, ECP III-B Volt Holdings, LLC, ECP III-C Volt Holdings, LP, ECP III-D Volt Holdings, LP, and ECP Checkerspot Holdings, LP. Energy Capital Partners IV, LLC, as a result of its indirect control over each of the following entities, may be deemed to share beneficial ownership of the securities held of record by each of ECP IV-A Volt Holdings, LP, ECP IV-B Volt Holdings, LP, ECP IV-C Volt Holdings, LP, and ECP IV-D Volt Holdings, LP. ECP Calpine GP, LLC, as a result of its direct control over ECP Calpine Fund GP, LP and indirect control over each of the following entities, may be deemed to share beneficial ownership of the securities held of record by each of ECP Calpine Continuation Fund, LP and ECP Calpine Rollover Fund, LP. ECP Calpine Fund GP, LP in its capacity as the general partner of ECP Calpine Continuation Fund, LP and ECP Calpine Rollover Fund, LP may also be deemed to share beneficial ownership of the securities held of record by each of ECP Calpine Continuation Fund, LP and ECP Calpine Rollover Fund, LP. ECP ControlCo, LLC is controlled by its board of managers, which consists of Douglas Kimmelman, Peter Labbat, Tyler Reeder, Rahman D'Argenio, Raoul Hughes and Xavier Robert, all of whom collectively share the power to vote and dispose of the securities beneficially owned by ECP ControlCo, LLC. As a result of the relationships described herein, each of ECP ControlCo, LLC and the individuals named herein may be deemed to share beneficial ownership of the securities that may be deemed to be beneficially owned by each of Energy Capital Partners IV, LLC, Energy Capital Partners III, LLC and ECP Calpine GP, LLC. Each of them disclaims any such beneficial ownership. See the information contained on the cover pages to this Schedule 13G. See the information contained on the cover pages to this Schedule 13G. See the information contained on the cover pages to this Schedule 13G. See the information contained on the cover pages to this Schedule 13G. See the information contained on the cover pages to this Schedule 13G. N Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Exhibit 99: Joint Filing Agreement (previously filed). ECP ControlCo, LLC By /s/ Jennifer Gray 08/07/2026 Energy Capital Partners III, LLC By: ECP ControlCo, LLC, its managing member, By: /s/ Jennifer Gray 08/07/2026 Energy Capital Partners IV, LLC By: ECP ControlCo, LLC, its managing member, By: /s/ Jennifer Gray 08/07/2026 ECP Calpine GP, LLC By: ECP ControlCo, LLC, its managing member, By: /s/ Jennifer Gray 08/07/2026 ECP III Volt Holdings, LLC By: Energy Capital Partners III, LP, Energy Capital Partners GP III, LP, Energy Capital Partners III, LLC, ECP ControlCo, LLC, By: /s/ Jennifer Gray 08/07/2026 ECP III-A Volt Holdings, LLC By: /s/ Jennifer Gray 08/07/2026 ECP III-B Volt Holdings, LLC By: /s/ Jennifer Gray 08/07/2026 ECP III-C Volt Holdings, LP By: ECP III Volt Holdings GP, LLC, its general partner, By: /s/ Jennifer Gray 08/07/2026 ECP III-D Volt Holdings, LP By: ECP III Volt Holdings GP, LLC, its general partner, By: /s/ Jennifer Gray 08/07/2026 ECP Checkerspot Holdings, LP By: Volt Parent GP, LLC, Energy Capital Partners III, LLC, ECP ControlCo, LLC, By: /s/ Jennifer Gray 08/07/2026 ECP IV-A Volt Holdings, LP By: ECP IV Volt Holdings GP, LLC, its general partner, By: /s/ Jennifer Gray 08/07/2026 ECP IV-B Volt Holdings, LP By: ECP IV Volt Holdings GP, LLC, its general partner, By: /s/ Jennifer Gray 08/07/2026 ECP IV-C Volt Holdings, LP By: ECP IV Volt Holdings GP, LLC, its general partner, By: /s/ Jennifer Gray 08/07/2026 ECP IV-D Volt Holdings, LP By: ECP IV Volt Holdings GP, LLC, its general partner, By: /s/ Jennifer Gray 08/07/2026 ECP Calpine Fund GP, LP By: ECP Calpine GP, LLC, its general partner, By: ECP ControlCo, LLC, its managing member, By: /s/ Jennifer Gray 08/07/2026 ECP Calpine Continuation Fund, LP By: ECP Calpine Fund GP, LP, By: ECP Calpine GP, LLC, By: ECP ControlCo, LLC, By: /s/ Jennifer Gray 08/07/2026 ECP Calpine Rollover Fund, LP By: ECP Calpine Fund GP, LP, By: ECP Calpine GP, By: LLC, ECP ControlCo, LLC, By: /s/ Jennifer Gray 08/07/2026