X0306 4 2012-12-14 1 0001126294 GenOn Energy, Inc. GEN 0001505252 Gaudette Robert J 1000 MAIN STREET HOUSTON TX 77002 0 1 0 0 SVP, Chief Commercial Officer Common Stock 2012-12-14 4 F 0 19561 2.87 D 250412 D Common Stock 2012-12-14 4 D 0 250412 D 0 D Stock Options 8.70 2012-12-14 4 D 0 1294 D 2016-01-13 Common Stock 1294 0 D Stock Options 8.84 2012-12-14 4 D 0 1271 D 2016-02-17 Common Stock 1271 0 D Stock Options 13.06 2012-12-14 4 D 0 6106 D 2013-03-07 Common Stock 6106 0 D Stock Options 3.67 2012-12-14 4 D 0 13846 D 2019-03-03 Common Stock 13846 0 D Stock Options 4.66 2012-12-14 4 D 0 31579 D 2020-03-11 Common Stock 31579 0 D Stock Options 3.81 2012-12-14 4 D 0 92087 D 2021-02-22 Common Stock 92087 0 D Stock Options 2.44 2012-12-14 4 D 0 144296 D 2022-02-26 Common Stock 144296 0 D The reporting person disposed of these shares in connection with the merger (the "Merger") involving GenOn Energy, Inc. and NRG Energy, Inc. in exchange for shares of NRG Energy, Inc. common stock, based on the exchange ratio of 0.1216 and having a market value of $23.00 per share on the effective date of the Merger, plus cash consideration for fractional shares. Upon completion of the Merger involving GenOn Energy, Inc. and NRG Energy, Inc., this fully-vested option was converted into an option to purchase 157 shares of NRG Energy, Inc. common stock at $71.55 per share. Upon completion of the Merger involving GenOn Energy, Inc. and NRG Energy, Inc., this fully-vested option was converted into an option to purchase 154 shares of NRG Energy, Inc. common stock at $72.70 per share. Upon completion of the Merger involving GenOn Energy, Inc. and NRG Energy, Inc., this fully-vested option was converted into an option to purchase 742 shares of NRG Energy, Inc. common stock at $107.41 per share. Upon completion of the Merger involving GenOn Energy, Inc. and NRG Energy, Inc., this fully-vested option was converted into an option to purchase 1,683 shares of NRG Energy, Inc. common stock at $30.19 per share. Upon completion of the Merger involving GenOn Energy, Inc. and NRG Energy, Inc., this fully-vested option was converted into an option to purchase 3,840 shares of NRG Energy, Inc. common stock at $38.33 per share. Upon completion of the Merger involving GenOn Energy, Inc. and NRG Energy, Inc., this fully-vested option was converted into an option to purchase 11,197 shares of NRG Energy, Inc. common stock at $31.34 per share. Upon completion of the Merger involving GenOn Energy, Inc. and NRG Energy, Inc., this option, which vests in three equal annual installments beginning February 27, 2013, was converted into an option to purchase 17,546 shares of NRG Energy, Inc. common stock at $20.07 per share. /s/ Allison B. Cunningham, Attorney-in-Fact 2012-12-18