- AES Corporation (The)
- American National Power, Inc.
- Calpine Corporation
- Dynegy Power Corp.
- Formosa Plastics Corp., Texas
- FPL Energy, LLC
- Frontera Generation LP
- Gregory Power Partners, L.P.
- PSEG Texgen I Inc.
- Sempra Texas Services
- Suez Energy
- Texas Genco, LLC
- Wolf Hollow I L.P.
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- Cobisa Corporation
- Sempra Energy Resources
- Tenaska Energy, Inc.
- Texas Independent Energy, LP
- Texas Petrochemicals, LP
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