X0306 4 2021-07-01 0001013871 NRG ENERGY, INC. NRG 0001636160 Callen David 804 CARNEGIE CENTER PRINCETON NJ 08540 1 Sr VP & Chief Accounting Offic Common Stock, par value $.01 per share 2021-07-01 4 S 0 163.0000 40.1000 D 40489.0000 D Common Stock, par value $.01 per share 2021-07-01 4 S 0 5000.0000 40.0900 D 35489.0000 D Common Stock, par value $.01 per share 2021-07-01 4 S 0 8137.0000 40.0700 D 27352.0000 D This transaction was executed in multiple trades at prices ranging from $40.07 to $40.16. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple trades at prices ranging from $39.75 to $40.23. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. Christine Zoino, by Power of Attorney 2021-07-06