- AES Corporation
- Airtricity
- Calpine Corporation
- Cielo Wind Power
- Dynegy Power Corp.
- Edison Mission Marketing & Trading
- Formosa Plastics Corp., Texas
- FPL Energy
- Gregory Power Partners
- International Power America Services
- Invenergy Wind Development
- Kelson Energy Inc.
- Navasota Energy Management
- NRG Texas
- PSEG Texgen I
- RES America Developments
- Signal Hill Wichita Falls Power
- Suez Energy Marketing NA
- Sweetwater Wind 2
- Topaz Power Group LLC
- Westar Energy
- Wolf Hollow I
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- Bosque Power Company
- Constellation Energy Control & Dispatch
- Guadalupe-Blanco River Authority
- NuCoastal Power Corporation
- PSEG Texas
- Tenaska Energy
- Texas Petrochemicals
- Whirlwind Energy
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