Arkansas Electric Cooperative Corporation (AECC) East Texas Electric Cooperative. (ETEC) Muscatine Power and Water (MPWM)
City of Ames (AMES) Great River Energy (GRE) Missouri Public Service (MPS)
Ameren (AMRN) City of Henderson, KY (HMPL) Missouri River Energy Svc (MRET)
Alliant Energy West (ALT) Hoosier Energy (HE) Northern IN Pub. Svc. Co. (NIPS)
American Transmission Co. (ATC) Indiana Municipal Power Agency (IMPA) Xcel Energy (NSP)
City of Alexandria, LA (AXLA) Indianola Municipal Utilities (IMU) Northwestern Wisconsin Electric Company (NWEC)
Basin Electric Power Cooperative (BEPM) Indianapolis Pwr & Light (IPL) Otter Tail Power (OTP)
Big Rivers Electric Corp (BREC) ITC Transmission (ITC) Pioneer Transmission LLC (PION)
Consumers Energy Company (CETO) ITC Midwest LLC (ITCM) Prairie Power, Inc. (PPI)
Cedar Falls Utilities (CFU) Lafayette Utilities System (LAFA) Rochester Public Utilities (RPU)
Central Iowa Power Cooperative (CIPC) Montana-Dakota Utilities Co. (MDU) SIGE-Vectren (SIGE)
Cleco Power LLC. (CLEC) Municipal Energy Agency of Nebraska (MEAN) Southern Illinois Power Cooperative (SIPC)
Central Minnesota Municipal Power Agency (CMMPA) MidAmerican Energy Co (MEC) Southern Minnesota Municipal Power Agency (SMPT)
Columbia Water & Light (CWLD) Michigan Elec Trans Co (METC) South Mississippi Electric Power Association. (SMEPA)
City Water, Light & Power (CWLP) Manitoba Hydro Elec Board (MHEB) Waverly Light and Power (WLP)
Dixie Electric Membership Corporation - DEMCO (DE38) MISO Willmar Municipal Utilities (WMU)
Duke Energy Business Services, LLC for Duke Energy Indiana, Inc. (DEI) Minnkota Power Cooperative Inc (MPCN) Wolverine Power Supply Cooperative (WPSC)
Dairyland Power Coop. (DPC) Minnesota Municipal Power Agency (MMPA) WPPI Energy (WPPT)
Entergy. (EES) Minnesota Power (MP) Wabash Valley Power Association (WVPA)
Michigan Public Power Agency (MPPA)