X0305 4 2012-05-10 0 0001126294 GenOn Energy, Inc. GEN 0001184731 DALLAS TERRY G 1000 MAIN STREET HOUSTON TX 77002 1 0 0 0 Common Stock 2012-05-10 4 A 0 29064 0.00 A 100854 D Cash Units 2012-05-10 4 A 0 14315 0.00 A Common Stock 14315 22765 D Comprised entirely of restricted stock units that can only be settled in common stock. In accordance with GenOn Energy's non-employee directors' compensation program, each non-employee director receives an annual award of restricted stock units. Each cash unit is the economic equivalent of one share of GenOn Energy, Inc. common stock. The cash units are payable in cash after the director terminates service as a member of the Board. /s/ Terry G. Dallas 2012-05-14