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