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AES Corporation Bull Creek Wind LLC Calpine Corporation E.ON Climate & Renewables NA LLC Edison Mission Marketing & Trading Inc. EDP Renewables North America LLC GDF Suez Energy Marketing NA Inc. Gregory Power Partners LP Iberdrola Renewables Inc. Invenergy Energy Management LLC NRG Texas LLC Odessa-Ector Power Partners LP RES America Development Inc. Sid Richardson Carbon and Energy Co. Signal Hill Wichita Falls Power LP Southern Power Company Sweetwater Wind 2 LLC Topaz Power Holdings LLC
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- BP Alternative Energy North America Inc.
Cobisa Corporation Exelon Generation Company Guadalupe-Blanco River Authority Hackberry Wind LLC LS Power Associates LP Pattern Energy Group LP Tenaska Energy Inc. Third Planet Windpower LLC Victoria WLE LP Whirlwind Energy LLC |