Mergers, Acquisitions, and Dispositions	6 Months Ended
Jun. 30, 2025
Mergers, Acquisitions, and Dispositions [Abstract]
Mergers, Acquisitions, and Dispositions	Mergers, Acquisitions, and Dispositions Proposed Acquisition of Calpine Corporation On January 10, 2025, we entered an agreement and plan of merger (Merger Agreement) with Calpine Corporation (Calpine) under which we will acquire all the outstanding equity interests of Calpine in a cash and stock transaction. Calpine owns and operates a generation fleet of natural gas, geothermal, battery storage, and solar assets with over 27 GWs of generation capacity, in addition to a competitive retail electric supplier platform serving approximately 60 TWhs of load annually. The merger consideration at closing will consist of an aggregate of 50 million newly issued shares of our common stock, no par value, and $4.5 billion in cash. We will also assume approximately $12.7 billion of Calpine’s outstanding debt. We expect to fund the cash portion of the transaction through a combination of cash on hand and cash flow generated by Calpine in the period between signing and closing of the transaction (that will be assumed at closing). Per the terms of the Merger Agreement, consummation of the transaction is to occur by December 31, 2025 (which date may be automatically extended to June 1, 2026, as further provided in the Merger Agreement). See Note 2 — Mergers, Acquisitions, and Dispositions of our 2024 Form 10-K for additional information. Regulatory approvals for the merger were received by the PUCT and NYPSC in June 2025 and by the FERC in July 2025. Completion of the transaction is conditioned upon review by the DOJ and other customary closing conditions. Fees incurred as part of the acquisition were not material to the Consolidated Statements of Operations and Comprehensive Income for the six months ended June 30, 2025. Acquisition of Joint Ownership in South Texas Project In November 2023, we completed the acquisition of NRG South Texas LP (renamed and converted as Constellation South Texas, LLC), which owns a 44% undivided ownership interest in the jointly owned STP, a 2,645 MW, dual-unit nuclear plant located in Bay City, Texas. The consideration transferred was $1.66 billion. Other owners include City Public Service Board of San Antonio (CPS, 40%) and the City of Austin, Texas (Austin, 16%). In May 2024, we executed a settlement agreement with all parties (CPS/City of San Antonio, Austin, and NRG Energy, Inc.), resolving all litigation involving our purchase of the ownership interest in STP. The terms of the settlement include us selling a 2% ownership interest in STP to CPS at the same price and terms that we paid NRG Energy, Inc. for our 44% interest. We are working towards closing the transaction in 2025 which remains subject to regulatory approvals (including the NRC and PUCT), the terms of settlement are not expected to have a material impact on our consolidated financial statements. See Note 2 — Mergers, Acquisitions, and Dispositions of our 2024 Form 10-K for additional information.

Mergers, Acquisitions, and Dispositions

6 Months Ended

Jun. 30, 2025

Mergers, Acquisitions, and Dispositions [Abstract]

Proposed Acquisition of Calpine Corporation

On January 10, 2025, we entered an agreement and plan of merger (Merger Agreement) with Calpine Corporation (Calpine) under which we will acquire all the outstanding equity interests of Calpine in a cash and stock transaction. Calpine owns and operates a generation fleet of natural gas, geothermal, battery storage, and solar assets with over 27 GWs of generation capacity, in addition to a competitive retail electric supplier platform serving approximately 60 TWhs of load annually. The merger consideration at closing will consist of an aggregate of 50 million newly issued shares of our common stock, no par value, and $4.5 billion in cash. We will also assume approximately $12.7 billion of Calpine’s outstanding debt. We expect to fund the cash portion of the transaction through a combination of cash on hand and cash flow generated by Calpine in the period between signing and closing of the transaction (that will be assumed at closing). Per the terms of the Merger Agreement, consummation of the transaction is to occur by December 31, 2025 (which date may be automatically extended to June 1, 2026, as further provided in the Merger Agreement). See Note 2 — Mergers, Acquisitions, and Dispositions of our 2024 Form 10-K for additional information.

Regulatory approvals for the merger were received by the PUCT and NYPSC in June 2025 and by the FERC in July 2025. Completion of the transaction is conditioned upon review by the DOJ and other customary closing conditions.

Fees incurred as part of the acquisition were not material to the Consolidated Statements of Operations and Comprehensive Income for the six months ended June 30, 2025.

Acquisition of Joint Ownership in South Texas Project

In November 2023, we completed the acquisition of NRG South Texas LP (renamed and converted as Constellation South Texas, LLC), which owns a 44% undivided ownership interest in the jointly owned STP, a 2,645 MW, dual-unit nuclear plant located in Bay City, Texas. The consideration transferred was $1.66 billion. Other owners include City Public Service Board of San Antonio (CPS, 40%) and the City of Austin, Texas (Austin, 16%). In May 2024, we executed a settlement agreement with all parties (CPS/City of San Antonio, Austin, and NRG Energy, Inc.), resolving all litigation involving our purchase of the ownership interest in STP. The terms of the settlement include us selling a 2% ownership interest in STP to CPS at the same price and terms that we paid NRG Energy, Inc. for our 44% interest. We are working towards closing the transaction in 2025 which remains subject to regulatory approvals (including the NRC and PUCT), the terms of settlement are not expected to have a material impact on our consolidated financial statements. See Note 2 — Mergers, Acquisitions, and Dispositions of our 2024 Form 10-K for additional information.