- Aquila Inc. dba Aquila Networks
- Bear Energy
- BP Energy
- Cargill Power Markets
- Citigroup Energy
- Constellation Energy Commodities Group
- Coral Power
- DB Energy Trading
- Endure Energy
- EPIC Merchant Energy TX
- Exelon Generation Company
- Fortis Energy Marketing & Trading GP
- J. Aron & Company
- Keystone Energy Partners
- Lehman Brothers Commodity Services
- Morgan Stanley Capital Group
- North American Energy Credit and Clearing-Delivery LLC
- PPM Energy Inc.
- Rainbow Energy Marketing
- Reliant Energy
- Tenaska Power Services Co.
- UBS AG, London Branch
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- ConocoPhillips Company
- Eagle Energy Partners I
- Edison Mission Marketing & Trading
- Occidental Power Services
- PSEG Energy Resources & Trade
- Xtend Energy
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