˙Ambit Energy
˙Ameren
˙Batavia MunicipalElectric
˙Champion Energy
˙ComEd
˙Direct Energy
˙Springfield City Water, Light & Power
˙Corn Belt Energy
Indiana
˙American Electric Power
˙Duke Energy
˙Indianapolis Power & Light
˙Northern IndianaPublic Service Company
Iowa
˙Interstate Power and Light Company (a part of Alliant Energy)
˙MidAmerican Energy
Kansas
˙Kansas City Board ofPublic Utilities
˙Kansas City Power & Light
˙Westar Energy
Kentucky
˙American Electric Power
˙Big Rivers Electric Corporation
˙Duke Energy
˙Henderson MunicipalPower and Light
˙Kentucky Utilities
˙Louisville Gas & Electric
˙Owensboro MunicipalUtilities
˙Tennessee Valley Authority
Louisiana
˙CLECO
˙Entergy
˙SWEPCO (a subsidiary of American Electric Power)
Maine
˙Emera (Bangor Hydro)
˙Iberdrola USA (Central Maine Power)
Maryland
˙Allegheny Power
˙Ambit Energy
˙Baltimore Gas & Electric
˙Choptank Electric Cooperative
˙Champion Energy
˙Direct Energy
˙Pepco Holdings (PEPCO, Delmarva Power)
˙Southern Maryland Electric Cooperative
Massachusetts
˙Ambit Energy
˙Chicopee Electric Light
˙Direct Energy
˙Holyoke Gas and Electric
˙Massachusetts Municipal Wholesale Electric Company (MMWEC)
˙Northeast Utilities (NSTAR, Western Massachusetts ElectricCompany/WMECO)
˙National Grid (Nantucket Electric; Massachusetts Electric)
˙Peabody Municipal Light Plant
˙South Hadley Electric Light
˙Westfield Gas & Electric
Michigan
˙American Electric Power
˙Consumers Energy
˙DTE Energy (Detroit Edison)
˙Xcel Energy
˙Holland Board of Public Works
˙Lansing Board of Water & Light
˙Upper Peninsula Power Company
˙We Energies
˙Wyandotte Municipal Services
Mississippi
