- CoGeneration
- Commonwealth Dynamics
- Commonwealth Edison
- CSC Ltd.
- Dresden Energy Facility
- Duquesne Light Co.
- Durable Slate Co.
- EME Homer City Generations Lp
- Dynegy
- Ergon West Virginia, Inc.
- ESI, Inc. of Tennessee
- Exxon
- Ferro Corporation
- First Energy
- General Electric
- GPU Energy
- GPU Generation Inc.
- Great Lakes Construction
- ITW Devcon
- J.J. White Incorporated
- Kansas City Power & Light
- Keyspan Energy Management
- Keystone Painting Co.
- Kirby Electric Co.
- KTA-Tator, Inc.
- Kvaerner Songer, Inc
- Jefferson Smurfitt Corporation
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- LVI Environmental Services
- McDonald Steel Corporation
- Mckamish Chesapeake Inc.
- Mobotec-USA, Inc.
- Montour Run Developing
- Ohio Health System
- Packaging Corp. of America
- Patent Construction Systems
- Peabody Construction
- Power Piping Company
- PPG Industries Inc.
- PSP Industries
- Quaker State Corp.
- RA Glancy & Sons, Inc.
- Ragnar Benson Inc.
- RRI Energy
- RJ Meyer Company
- Sears Oil Co.
- Shenango, Inc.
- US Steel
- United Refining Co.
- Von Roll America, Inc.
- West Penn Power Co.
- Westmoreland County
- Wheeling-Pittsburgh Steel
- Witco Corporation
- Zinc Corp. of America
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