- Aquila, Inc. dba Aquila Networks
- BP Energy Company
- Cargill Power Markets
- Cincinnati Gas & Electric Company (The)
- Citadel Energy Products
- Citigroup Energy
- Constellation Energy Commodities Group
- Coral Power
- Exelon Generation Company
- Fulcrum Power Services
- J. Aron & Company
- Mirant Energy Trading
- PPM Energy
- Rainbow Energy Marketing Corporation
- Reliant Energy
- Tenaska Power Services Co.
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- Alcoa
- ConocoPhillips Company
- Eagle Energy Partners I
- North American Energy Credit and Clearing-Delivery
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