Results of Operations and Financial Condition. On November 3, 2026, Talen Energy Corporation (“Talen”) announced via press release its third quarter 2026 financial and operating results. A copy of the earnings release is furnished as Exhibit 99.1 to this Current Report on Form 8-K (this “Report”). The information provided under this

CEO — Mark "Mac" A. McFarland: The filing announces a planned CEO succession where the current CEO retires and is replaced by an internal promotion, which is an orderly transition rather than a sudden loss of leadership.

Regulation FD Disclosure. On September 29, 2026, the Company issued a press release regarding the executive matters described above, and additionally announcing its entry into the capacity monetization transaction, the upsize of the Company’s share repurchase program and its entry into accelerated share repurchase agreements, each as described below, a copy of which is furnished as Exhibit 99.1 to this Report and which is incorporated by reference into this

Other Events. Capacity Monetization Transaction On September 25, 2026, Talen Energy Marketing, LLC (“TEM”), an indirect wholly owned subsidiary of the Company, entered into an arrangement with an unaffiliated third party to sell future capacity revenues awarded by PJM and cleared by TEM in PJM’s capacity auctions for the 2027/2028 and 2028/2029 delivery years (the “Capacity Monetization Transaction”) related to certain of the Company’s generation fleet. Under the terms of the Capacity Monetiz…

Results of Operations and Financial Condition. On August 5, 2026, Talen Energy Corporation (“Talen”) announced via press release its second quarter 2026 financial and operating results. A copy of the earnings release is furnished as Exhibit 99.1 to this Current Report on Form 8-K (this “Report”). The information provided under this

by reference. In connection with the Acquisition, the Acquired Companies are expected to become guarantors under each of TES’s (as defined below) existing debt instruments in accordance with, and within the time periods required by, the terms thereof. Credit Agreement Amendment On June 15, 2026, Talen Energy Supply, LLC (“TES”), a wholly owned subsidiary of the Company, entered into Amendment No. 7 to the Credit Agreement, by and among TES, as Borrower, the Subsidiary Guarantors party thereto…

The issuance of the Stock Consideration was completed in reliance upon the exemption from the registration requirements of the Securities Act, provided by Section 4(a)(2) thereof as a transaction by an issuer not involving any public offering.

by reference. On the Closing Date, the Company completed the previously announced Acquisition contemplated by the Merger Agreement. As a result of the Acquisition, the Acquired Companies became indirect, wholly owned subsidiaries of the Company. Subject to the terms and conditions of the Merger Agreement, the purchase price for the Acquisition consisted of (a) the Cash Consideration of approximately $2.55 billion, subject to customary adjustments for net working capital, cash, indebtedness, c…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information provided under

Entry into a Material Definitive Agreement. On May 20, 2026, Talen Energy Supply, LLC (the “Borrower”), a direct subsidiary of Talen Energy Corporation (the “Company”), amended its credit agreement (as amended, the “Amended Credit Agreement”). Capitalized terms used but not defined herein have the meaning provided in the Amended Credit Agreement, which is filed as Exhibit 10.1 to this Current Report on Form 8-K (this “Report”). The Amended Credit Agreement: (i) reprices the Borrower’s existin…

Results of Operations and Financial Condition. On May 5, 2026, Talen Energy Corporation (“Talen”) announced via press release its first quarter 2026 financial and operating results. A copy of the earnings release is furnished as Exhibit 99.1 to this Current Report on Form 8-K (this “Report”). The information provided under this

Other Events. On April 17, 2026, Talen Energy Corporation (the “Company”) issued a press release announcing that Talen Energy Supply, LLC (“TES”), a direct wholly owned subsidiary of the Company, priced issuances of $1.50 billion in aggregate principal amount of 6.125% senior notes due 2031 (the “2031 Notes”) and $2.50 billion in aggregate principal amount of 6.375% senior notes due 2033 (the “2033 Notes” and, together with the 2031 Notes, the “Notes”) in private placement transactions not in…

Results of Operations and Financial Condition. On February 26, 2026, Talen Energy Corporation (“Talen”) announced via press release its fourth quarter and full year 2025 financial and operating results. A copy of the earnings release is furnished as Exhibit 99.1 to this Current Report on Form 8-K (this “Report”). The information provided under this

Entry Into a Material Definitive Agreement. Merger Agreement On January 15, 2026, Talen Energy Corporation, a Delaware corporation (the “Company”), Buckeye CG Holdings, LLC, a Delaware limited liability company and an indirect wholly owned subsidiary of the Company (“Buyer”), and certain other indirect wholly owned subsidiaries of the Company, entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Cornerstone Generation Holdings, LP, a Delaware limited partnership, ECP Cor…

Any issuance of common stock will be completed in reliance upon the exemption from the registration requirements of the Securities Act, provided by Section 4(a)(2) thereof as a transaction by an issuer not involving any public offering.

and in Exhibit 99.1 and Exhibit 99.2 to this Report is being furnished and shall not be deemed “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section. Such information shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act or the Exchange Act. Forward-Looking Statements This Report, including Exhibit 99.1 and Exhibit 9…

President — Terry L. Nutt: The filing announces a coordinated succession plan involving the promotion of the CFO to President and the appointment of new C-suite officers, rather than a sudden loss of a senior executive.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information provided under

by reference. Credit Agreement Amendment On the Closing Date, Talen Energy Supply, LLC (“TES”), a direct wholly owned subsidiary of the Company, entered into Amendment No. 5 to the Credit Agreement, by and among TES, as borrower, the subsidiary guarantors party thereto, the lenders party thereto and Citibank, N.A., as administrative agent and collateral agent (the “Fifth Amendment to Credit Agreement”) which amends that certain Credit Agreement, dated as of May 17, 2023, by and among TES, as…

by reference. On the Closing Date, the Company, through Talen Generation, consummated the Acquisitions pursuant to the Purchase Agreements and acquired all of the issued and outstanding membership interests in (i) Moxie Freedom LLC, a Delaware limited liability company and (ii) Guernsey Power Holdings, LLC, a Delaware limited liability company (which owns 100% of the membership interests in Guernsey Power Station LLC, a Delaware limited liability company) (collectively, the “Acquired Entities…

Results of Operations and Financial Condition. On November 5, 2025, Talen Energy Corporation (“Talen”) announced via press release its third quarter 2025 financial and operating results. A copy of the earnings release is furnished as Exhibit 99.1 to this Current Report on Form 8-K (this “Report”). The information provided under this

Entry into a Material Definitive Agreement. The Offerings On October 27, 2025, Talen Energy Supply, LLC (“TES”), a direct wholly owned subsidiary of Talen Energy Corporation (the “Company”), completed its previously announced offerings (the “Offerings”) of $1.40 billion in aggregate principal amount of 6.250% senior notes due 2034 (the “2034 Notes”) and $1.29 billion in aggregate principal amount of 6.500% senior notes due 2036 (the “2036 Notes” and together with the 2034 Notes, the “Notes”)…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet. The disclosures under

Regulation FD Disclosure. On October 10, 2025, Talen Energy Corporation (the “Company”) issued a press release announcing that Talen Energy Supply, LLC (“TES”), a direct wholly owned subsidiary of the Company, had priced its previously announced offerings of $1.40 billion in aggregate principal amount of 6.250% senior notes due 2034 and $1.29 billion in aggregate principal amount of 6.500% senior notes due 2036 (the “Offerings”) in private offerings that are exempt from the registration requi…

Regulation FD Disclosure. Senior Notes Offerings On October 9, 2025, Talen Energy Corporation (the “Company”) issued a press release announcing that Talen Energy Supply, LLC (“TES”), a direct wholly owned subsidiary of the Company, was proposing to offer and sell (the “Offerings”), subject to market and other conditions, senior notes due 2034 and senior notes due 2036 in a private offering that is exempt from the registration requirements of the Securities Act of 1933, as amended (the “Securi…