- AES Corporation
- Airtricity
- American National Power
- Calpine Corporation
- Dynegy Power Corp.
- Formosa Plastics Corp., Texas
- FPL Energy
- Gregory Power Partners
- Navasota Energy Management
- NRG Texas
- PSEG Texgen I
- Sempra Texas Services
- Suez Energy Marketing NA
- Ticona Polymer
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- Cobisa Corporation
- Guadalupe-Blanco River Authority
- Sempra Generation
- Tenaska Energy
- Texas Independent Energy
- Texas Petrochemicals
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