- Alcoa, Inc.
- Cargill Power Markets, LLC
- Cincinnati Gas and Electric Company
- Citadel Energy Products, LLC
- Coral Power, LLC
- Exelon Generation Company, LLC
- J. Aron & Company
- Mirant Americas Energy Marketing, LP
- Morgan Stanley Capital Group, Inc.
- Rainbow Energy Marketing Corporation
- Reliant Resources, Inc.
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- Constellation Power Source, Inc.
- Energy Transfer Group, LLC
- Liberty Power Corp.
- Longhorn Power, LP
- ONEOK Energy Marketing and Trading Company, LP
- TECO EnergySource, Inc.
- Tenaska Power Services Co.
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