- AES Corporation
- American National Power, Inc.
- Calpine Corporation
- Dynegy Power Corp.
- Formosa Plastics Corp., Tx.
- FPL Energy
- Frontera Generation Limited Partnership
- Gregory Power Partners, LP
- PSEG Texgen I Inc.
- Sempra Energy Resources
- Tenaska Energy, Inc.
- Tractebel Energy Marketing, Inc.
- Wharton County Power Partners
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- Cobisa Corporation
- Guadalupe-Blanco River Authority
- Panda Texas Merchant Holdings, LLC
- Texas Independent Energy, LP
- Texas Petrochemicals, LP
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