Exhibit 99.1 NRG Energy, Inc. Reports Third Quarter Results, Reaffirms 2025 Financial Guidance, and Initiates 2026 Standalone Guidance HOUSTON—November 6, 2025—NRG Energy, Inc. (NYSE: NRG) today announces financial results for the third quarter ended September 30, 2025, and reports GAAP Net Income of $152 million, GAAP Earnings per Share (EPS) — basic of$0.70, and GAAP Cash Provided by Operating Activities of $484 million. The Company's non-GAAP metrics are Adjusted Net Income of$537 million, Adjusted EPS ...