- AmerGen Energy
- American Public Power Association
- Aquila
- Atlantic Richfield Corporation (ARCO)
- Bonneville Power Authority
- Caltex – Indonesia
- Central Maine Power Corporation
- Chevron Information Technology Co.
- Enron International
- Niagara Mohawk Power Corp.
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- North Atlantic Energy Services
- Northern Illinois Gas- Ontario Hydro
- Ontario Power Generation
- PG&E Energy Trading/Gas Transmission
- Phillips Petroleum
- San Diego County Water Authority
- Silicon Valley Oil Company
- Southern Company
- Sunoco (SUNCOR)
- Westinghouse Savannah River Co.
- Wisconsin Gas Corporation
- Woodside Petroleum |