- Alcoa, Inc.
- Aquila, Inc. dba Aquila Networks
- BP Energy Company
- Cargill Power Markets, LLC
- Cincinnati Gas and Electric Company (The)
- Citadel Energy Products, LLC
- Constellation Energy Commodities Group, Inc.
- Coral Power, LLC
- Exelon Generation Company, LLC
- Fulcrum Power Services L.P.
- J. Aron & Company
- Mirant Americas Energy Marketing, LP
- Morgan Stanley Capital Group, Inc.
- PPM Energy, Inc.
- Rainbow Energy Marketing Corporation
- Reliant Energy, Inc.
- Tenaska Power Services Co.
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- Eagle Energy Partners I, LP
- Energy Transfer Group, LLC
- ONEOK Energy Marketing and Trading Company, LP
- TECO EnergySource, Inc.
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