Exelon Corporation and its No affiliates Wiscsonsin Electric Power No Company Brazos Electric Power No Cooperative Kansas City & Light No California Independent System No Operator Southern California Edison Yes ATCO Electric Yes Northeast Power Coordinating Yes Council Southwest Power Pool Yes Regional Entity NRG Energy Companies Yes PNGC Comment Group Yes PPL Corporation NERC Yes Registered Affiliates Dominion Yes
Exelon Corporation and its affiliates No Wiscsonsin Electric Power Company No Brazos Electric Power Cooperative No Kansas City & Light No California Independent System Operator No Southern California Edison Yes ATCO Electric Yes Northeast Power Coordinating Council Yes Southwest Power Pool Regional Entity Yes NRG Energy Companies Yes PNGC Comment Group Yes PPL Corporation NERC Registered Affiliates Yes Dominion Yes
Comment_Report_D_052212.docx