- AEP
- American Water
- Anchorage Water and Wastewater Utility
- Areva NC La Hague
- Atmos Energy Corporation
- Basic Energy
- Belacom
- BC Hydro
- BG Exploration & Production
- Bowater, Inc.
- British Energy
- Burbank Public Services Department
- Case New Holland America LLC.
- CEZ
- City of Charlotte
- City of Chicago Department of Water
- City of San Diego MWWD O&M
- City of Seattle
- CityCab Pte Ltd
- Cox Communications
- Duke Energy
- Exelon Business Services Company
- Dell Services
- Frontier Refining & Marketing
- GE Advanced Materials
- Georgia Pacific
- GP Cellulose, LLC
- Greater Cincinnati Water Works
- Hill-Rom, Inc.
- Huntsman Corporation
- Idaho Power Company
- Inland Paper Board & Packaging, Inc.
- J.G. Boswell
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- Kootenai Electric Cooperative Inc.
- Leeds Teaching Hospital NHS Trust
- MTS Communications
- New York City Department of Education
- NMC
- ONEOK
- PAKS Nuclear Power Plant Ltd
- Platte River Power Authority
- Portland General Electric
- PPL Corporation
- Progress Energy
- Rock-Tenn Company
- Royal KPN
- Smurfit-Stone Container Corporation
- South African Rail Commuter Corporation
- Sprint Nextel Corporation
- Sunoco, Inc.
- Telkom SA
- Tembec Inc.
- Tennessee Valley Authority
- Texas Utilities
- The Kroger Co.
- Time Warner Cable
- Tokyo Electric Power Company
- Transocean Offshore Deepwater Drilling Inc.
- T-Systems
- U.S. Steel Corporation
- University of Regina, SK - Canada
- Vanderbilt University
- Vectren Corporation
- Williams Energy
- Yorkshire Water
- Xcel Energy
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