- Cargill Power Markets, LLC
- Citadel Energy Products, LLC
- Constellation Power Source
- Coral Power LLC
- Duke Energy North America
- Exelon Generation Company, LLC
- J. Aron & Company
- Longhorn Power, LP
- Mirant Americas Energy Marketing LP
- Morgan Stanley Capital Group, Inc.
- NRG Power Marketing, Inc.
- PG&E National Energy Group
- Rainbow Energy Marketing Corporation
- Reliant Resources, Inc.
- RWE Trading Americas, Inc.
- UBS AG, London Branch
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- Alcoa, Inc.
- Calpine Energy Service, LP
- Liberty Power Corp.
- ONEOK Energy Marketing and Trading Company, LP
- TECO EnergySource, Inc.
- Tenaska Power Services Company
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