Power Generation
- Alabama Electric Power
- American Electric Power
- Bear Paw Energy LLC
- Boston Edison Company
- California Energy Company
- Consolidated Edison Co. of N.Y.
- Covanta Energy Company
- Delaware Electric, Inc.
- Dominion Nuclear
- Duke Energy Corporation
- Eagle Cogeneration
- Exelon Corporation
- Florida Power & Light
- Georgia Power
- Gulf Energy LLC
- Indiana Michigan Power
- Jersey Central Power & Light
- Keyspan Energy
- Linde Gas
- Long Island Lighting Company
- McGuire Nuclear Station
- Muscatine Power and Water
- National Grid Energy Company
- Natural Energy of Hawaii
- Northeast Nuclear Energy Company
- NRG Energy Group
- Osborne Cogeneration Pty Ltd
- Pennsylvania Power and Light
- Philadelphia Electric
- Potomac Electric Power Co
- PSE&G Power Connecticut
- Public Service Electric & Gas NJ
- Puerto Rican Power
- Rentech Energy Midwest Corporation
- Rosarito Power Plant Mexico
- Rutgers Cogeneration Power Plant
- Shell Canada Energy
- Talen Energy
- Texas Municipal Power Agency
- Transcanada Ravenswood
- United Illuminating Company
- Virginia Electric and Power Co
- Western Farmers Electric
Waste Water Customers
- Brick Township Municipal Utilities, NJ
- City of Anchorage, AK
- City of Bremerton WWTP, WA
- City of Cape May MUA, NJ
- City of Charlotte, NC
- City of Clear Lake, FL
- City of Colorado Springs, CO
- City of Covington, PA
- City of Denison, TX
- City of Dover, DE
- City of El Paso, TX
- City of Elizabeth City, NC
- City Of Gainesville, FL
- City of Greeley, CO
- City of Jacksonville Beach, FL
- City of Kalamazoo, MI
- City of Lima WWTP, OH
- City of Lompoc, CA
- City of Lynn Haven, FL
- City of Mansfield WWTP, OH
- City of McMinnville, OR
- City of New York, NY
- City of Pismo Beach, CA
- City of Raleigh WWTP, NC
- City of Rapid City, MI
- City of Salina, KS
- City of Santa Paula, CA
- City of Sarasota, FL
- City of Sitka, AK
- City of St. Petersburg, FL
- City of Tampa, FL
- City of Virginia Beach, VA
- City of Warren, OH
- City of Wilmington, DE
- City of Wingo, KS
- City of Wood Dale, IL
- South Chautauqua Lake Sewer District, NY
- WasteWater Resources Inc., AZ
