NRG Energy: Of Form8k And The Pro Forma Financial Information Required To Be Filed In Connection With The Transaction Under Item 9.01(b)of Form8k (the “form8k/a”), Other Events

Item 9.01(a) of Form 8-K and the pro forma financial information required to be filed in connection with the Transaction under Item 9.01(b) of Form 8-K (the “Form 8-K/A”). Item 8.01Other Events This Current Report on Form 8-K is being filed to provide the following information related to the Company’s acquisition of the Acquired Companies: (i) (x) Lightning Power, LLC and its subsidiaries’ audited consolidated financial statements as of December 31, 2025 and for the year ended December 31, 2025 and for the period August 9, 2024 to December 31, 2024, (y) Fund III Projects’ audited combined financial statements for the period January 1, 2024 to August 8, 2024 and (z) Gridiron Intermediate Holdings, LLC and its subsidiaries’ audited consolidated financial statements for the period January 1, 2024 to August 8, 2024 (the “Lightning Financial Statements”), (ii) Linebacker Power Funding, LLC and its subsidiaries’ audited consolidated financial statements as of December 31, 2025 and for the years ended December 31, 2025 and 2024 (the “Linebacker Financial Statements”), (iii) CCS Power Finance Co, LLC and its subsidiaries’ audited consolidated financial statements as of December 31, 2025 and for the years ended December 31, 2025 and 2024 (the “CCS Financial Statements” and, collectively with the Lightning Financial Statements and the Linebacker Financial Statements, the “Audited Financial Statements”) and (iv) the Company’s unaudited pro forma combined financial information as of and for the year ended December 31, 2025, after giving effect to the Transaction (the “Pro Forma Financial Information” and, together with the Audited Financial Statements, the “Financial Information”). The Financial Information updates and supplements the audited consolidated financial statements of the Acquired Companies and unaudited pro forma combined financial information of the Company and related disclosures contained in Exhibits 99.1, 99.5, 99.7 and 99.9 to the Form 8-K/A. To the extent that information in this Current Report on Form 8-K differs from or updates information contained in the Form 8-K/A, the information in this Current Report on Form 8-K shall supersede or supplement the information in the Form 8-K/A. The Financial Information included in this Current Report on Form 8-K has been presented for informational purposes only. It does not purport to represent the actual results or project future operating results of the Company following the Transaction. Item 9.01. Financial Statements and Exhibits. (a) Financial Statements of Business Acquired 1.Audited consolidated financial statements of Lightning Power, LLC and its subsidiaries as of December 31, 2025 and for the year ended December 31, 2025 and for the period August 9, 2024 to December 31, 2024 and the related notes thereto, which are included as Exhibit 99.1 hereto and incorporated herein by reference; 2.Audited combined financial statements of Fund III Projects for the period January 1, 2024 to August 8, 2024, and the year ended December 31, 2023 and the related notes, which are included as Exhibit 99.2 and incorporated by reference herein; 3.Audited consolidated financial statements of Gridiron Intermediate Holdings, LLC and its subsidiaries for the period January 1, 2024 to August 8, 2024, and the year ended December 31, 2023 and the related notes, which are included as Exhibit 99.3 and incorporated by reference herein; 4.Audited consolidated financial statements of Linebacker Power Funding, LLC and its subsidiaries as of December 31, 2025 and for the years ended December 31, 2025 and 2024 and the related notes thereto, which are included as Exhibit 99.4 hereto and incorporated herein by reference; and 5.Audited consolidated financial statements of CCS Power Finance Co, LLC and its subsidiaries as of December 31, 2025 and for the years ended December 31, 2025 and 2024 and the related notes thereto, which are included as Exhibit 99.5 hereto and incorporated herein by reference. (b) Pro Forma Financial Information The Company is providing the unaudited pro forma combined financial information of the Company, after giving effect to the Transaction, which includes the unaudited pro forma combined balance sheet as of December 31, 2025 and the unaudited pro forma combined statement of operations for the year ended December 31, 2025. Such unaudited pro forma combined financial information and the related notes thereto is set forth in Exhibit 99.6 hereto and incorporated herein by reference. (d) Exhibits Exhibit No. Description 23.1 Consent of KPMG LLP, independent auditors of Lightning Power, LLC. 23.2 Consent of KPMG LLP, independent auditors of Fund III Projects. 23.3 Consent of KPMG LLP, independent auditors of Gridiron Intermediate Holdings, LLC. 23.4 Consent of KPMG LLP, independent auditors of Linebacker Power Funding, LLC. 23.5 Consent of KPMG LLP, independent auditors of CCS Power Finance Co, LLC. 99.1 Audited consolidated financial statements of Lightning Power, LLC and its subsidiaries as of December 31, 2025 and for the year ended December 31, 2025 and for the period August 9, 2024 to December 31, 2024 and the related notes thereto. 99.2 Audited combined financial statements of Fund III Projects for the period January 1, 2024 to August 8, 2024, and the year ended December 31, 2023 and the related notes thereto (incorporated by reference to Exhibit 99.4 to the Company’s Current Report on Form 8-K filed with the SEC on September 24, 2025, File No. 001-15891). 99.3 Audited consolidated financial statements of Gridiron Intermediate Holdings, LLC and its subsidiaries for the period January 1, 2024 to August 8, 2024, and the year ended December 31, 2023 and the related notes thereto (incorporated by reference to Exhibit 99.6 to the Company’s Current Report on Form 8-K filed with the SEC on September 24, 2025, File No. 001-15891). 99.4 Audited consolidated financial statements of Linebacker Power Funding, LLC and its subsidiaries as of December 31, 2025 and for the years ended December 31, 2025 and 2024 and the related notes thereto. 99.5 Audited consolidated financial statements of CCS Power Finance Co, LLC as of December 31, 2025 and for the years ended December 31, 2025 and 2024 and the related notes thereto. 99.6 Unaudited pro forma combined financial information of NRG Energy, Inc. after giving effect to the Transaction, which includes the unaudited pro forma combined balance sheet as of December 31, 2025 and the unaudited pro forma combined statements of operations for the year ended December 31, 2025, and the related notes thereto. 104 Cover Page Interactive Data File - the cover page XBRL tags are embedded within the IXBRL document. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Dated: March 2, 2026 NRG Energy, Inc. (Registrant) By: /s/ Christine A. Zoino Christine A. Zoino Corporate Secretary

NRG Energy: Of Form8k And The Pro Forma Financial Information Required To Be Filed In Connection With The Transaction Under Item 9.01(b)of Form8k (the “form8k/a”), Other Events

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