- Boise Cascade Corporation
- Champion International Corporation
- City of New York
- Gaylord Container Corporation
- Georgia Pacific Corporation
- Georgia Power Company
- Gulf Power Company
- Inland Rome, Inc.
- Lone Star Industries
- Medusa Cement Company
- Mississippi Power Company
- Northern States Power Company
- Nekoosa Packaging
- Scott Paper Company
- Stone Container Corporation
- Tenneco Packaging
- Tosco Refining Company
- Willamette Industries
- Carolina Power and Light
- American Air Filter - Changshu, China
- St. Laurent
- American Municipal Power
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- City Public Service of San Antonio
- Gulf States Utilities
- MacMillan-Bloedel
- US Steel
- Alabama Power Company
- Alabama Electric Cooperative
- Savannah Electric
- Acme Steel
- Westvaco
- Bowater, Incorporated
- Empire Iron Mining
- Citgo Refinery Company
- Inland - Orange, TX
- Lockheed Martin Utility Services
- Pure Air
- Weyerhaeuser Company
- Amoco Oil Company
- Resource Authority of Sumner County
- Unocal / Wilmington Plant
- Fluor Daniel
- Bechtel
- Biothermica - Fjord Cell
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