Acquisitions and Divestitures	3 Months Ended
Mar. 31, 2026
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Acquisitions and Divestitures	17. Acquisitions and Divestitures 2026 Pending Acquisition Cornerstone Acquisition. In January 2026, the Company entered into the Cornerstone Merger Agreement with affiliates of Energy Capital Partners to purchase (i) the Lawrenceburg Power Plant, a 1,120 MW natural gas fired combined cycle generation located in Lawrenceburg, Indiana, (ii) the Waterford Energy Center, a 875 MW natural gas fired combined cycle generation plant located in Waterford Township, Ohio; and (iii) the Darby Generating Station, a 456 MW natural gas combustion turbine plant located in Mount Sterling, Ohio, for a price of $3.45 billion, consisting of $2.55 billion in cash, subject to working capital and other customary adjustments, and 2,400,000 shares of TEC common stock, valued at approximately $900 million at the time of entry into the Cornerstone Merger Agreement. The final value of the equity portion of the transaction price will be based on the value of Talen common stock at the close of the transaction. The cash portion of the purchase price will be funded from the proceeds of the Unsecured Notes due 2031 and 2033 which were issued in April 2026. The Cornerstone Acquisition will substantially expand Talen’s presence in the western PJM market and add additional efficient baseload generation assets to its fleet. The transaction is expected to close early in the second half of 2026 and is subject to the satisfaction of customary closing conditions and regulatory approvals from the FERC, Indiana Utility Regulatory Commission and other regulatory agencies. The waiting period pursuant to the Hart-Scott-Rodino Act of 1976 expired in March 2026.

Acquisitions and Divestitures

3 Months Ended

Mar. 31, 2026

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

Acquisitions and Divestitures

17. Acquisitions and Divestitures

2026 Pending Acquisition

Cornerstone Acquisition. In January 2026, the Company entered into the Cornerstone Merger Agreement with affiliates of Energy Capital Partners to purchase (i) the Lawrenceburg Power Plant, a 1,120 MW natural gas fired combined cycle generation located in Lawrenceburg, Indiana, (ii) the Waterford Energy Center, a 875 MW natural gas fired combined cycle generation plant located in Waterford Township, Ohio; and (iii) the Darby Generating Station, a 456 MW natural gas combustion turbine plant located in Mount Sterling, Ohio, for a price of $3.45 billion, consisting of $2.55 billion in cash, subject to working capital and other customary adjustments, and 2,400,000 shares of TEC common stock, valued at approximately $900 million at the time of entry into the Cornerstone Merger Agreement. The final value of the equity portion of the transaction price will be based on the value of Talen common stock at the close of the transaction. The cash portion of the purchase price will be funded from the proceeds of the Unsecured Notes due 2031 and 2033 which were issued in April 2026. The Cornerstone Acquisition will substantially expand Talen’s presence in the western PJM market and add additional efficient baseload generation assets to its fleet.

The transaction is expected to close early in the second half of 2026 and is subject to the satisfaction of customary closing conditions and regulatory approvals from the FERC, Indiana Utility Regulatory Commission and other regulatory agencies. The waiting period pursuant to the Hart-Scott-Rodino Act of 1976 expired in March 2026.