AERA Energy LLC
Alabama Power Co
Allegheny Energy Co
American Electric Power Co
Arizona Public Service Co
Associated Electric
Basin Electric Power Corp
Battelle Energy Alliance
Bonneville Power Administration
C/P Utility Services
CalEnergy Operating Co
Central Maine Power Co
Consumers Energy Co
Consumers Power
Dairyland Power Cooperative
Dominion Power Co
Dominion Nuclear CT
Duke Energy Co
Duke Power Co
Duquesne Light Co
Dynergy Midwest Generation
Energy Transfer Company
Entergy Services Inc
Escambia County Utilities Authority
First Energy Corp
Florida Water Service
Hernando County Utilities Dept
Houston Power & Light Co
Illinois Power Co
Kinder Morgan
Kinectrics
Metropolitan Water District
Montana Power Co
Northeast Utilities
Northern States Power Co

NorthWestern Energy Co
Nuclear Fuel Services Inc.
Ohio Edison Co
Omaha Public Power District
Ontario Hydro
Ontario Power Generation
Pacific Corp Environmental Remediation
Pacificorp
Pacific Gas & Electric Co
Pennsylvania Power & Light
Pinellas County Utilities Lab
Portland General Electric
Portland Water Bureau
Potomac Electric Power Co
Prairie State Generating Company
PSEG
SaskPower - Fuel Supply
South Carolina Electric & Gas
Southern California Edison
Southern Company Services
Southern States Utilities
Southern Union Gas
Spectra Energy
Spokane County Utilities
St. Johns County Utilities
Talisman Energy Inc
Tampa Bay Water
Tampa Electric Co
Valero Energy Corp
United Water Conservation District
Virginia Power Co
Western Energy Company
Western Kentucky Energy Co
Wisconsin Electric Power Co
Yankee Gas Services Co
Zone 7 Water Agency