- AES Corporation
- AM-PRES Corporation
- Calpine Corporation
- Cielo Wind Services Inc.
- Dynegy Power Corp.
- E.ON Climate & Renewables NA Inc.
- Edison Mission Marketing & Trading Inc.
- Formosa Plastics Corp., Texas
- GIM Channelview Cogeneration LLC
- Gregory Power Partners LP
- Horizon Wind Energy LLC
- Invenergy Energy Management LLC
- International Power America Services Inc.
- Kelson Energy Inc.
- Navasota Energy Management LLC
- NextEra Energy Resources LLC
- NRG Texas LLC
- Power Resources Ltd.
- PSEG Texas LP
- RES America Development Inc.
- Signal Hill Wichita Falls Power LP
- Suez Energy Marketing NA Inc.
- Sweetwater Wind 2 LLC
- Topaz Power Holdings LLC
- Westar Energy Inc.
- Wolf Hollow I LP
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- BP Alternative Energy North America Inc.
- Cobisa Corporation
- Guadalupe-Blanco River Authority
- Hackberry Wind LLC
- LS Power Associates LP
- PSEG Texgen I Inc.
- ReNu Power Holdings LLC
- Texas Petrochemicals LP
- Tenaska Energy Inc.
- Whirlwind Energy LLC
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