Talen Energy files 8-K: other material event

Item 8.01. Other Events.

On November 9, 2026, certain indirect wholly owned subsidiaries of Talen Energy Corporation, a Delaware corporation (the “Company”), entered into ordinary course capacity sale transactions with an investment grade counterparty in PJM. Specifically, the Company’s wholly owned indirect subsidiary, Guernsey Power Station LLC, a Delaware limited liability company (“Guernsey”), entered into two capacity sale transactions with the investment grade counterparty, for the sale of available installed capacity (“ICAP”) that converts to Unit-Specific Accredited Unforced Capacity (“UCAP”) from Guernsey Power Station, an 1,836 megawatts (“MW”) (summer rating) natural gas-fired combined cycle generation plant located in Guernsey County, Ohio, for (a) 750 MW UCAP for PJM Delivery Years 2029/2030 through 2035/2036 (the “Guernsey 7-Year Capacity Sale”); and (b) the remainder of 588 MW UCAP from Guernsey Power Station for PJM Delivery Year 2029/2030. In addition, the Company’s wholly owned indirect subsidiary, Waterford Power, LLC, a Delaware limited liability company (“Waterford”), entered into a capacity sale transaction with the investment grade counterparty for the sale of all UCAP from the Waterford Energy Center, an 869 MW combined cycle gas turbine facility located in Waterford, Ohio, for the PJM Delivery Years 2029/2030 through 2031/2032.

The Guernsey 7-Year Capacity Sale is expected to generate approximately $100 million per year in revenue. The capacity sale transactions are not subject to any closing conditions.