Arkansas Electric Cooperative Corporation (AECC) Entergy. (EES) Minnesota Power (MP)
American Electric Power Service Corp. (AEPSC) East Texas Electric Cooperative. (ETEC) Michigan Public Power Agency (MPPA)
City of Ames (AMES) GridLiance Heartland LLC (GLH) Muscatine Power and Water (MPWM)
Ameren (AMRN) Great River Energy (GRE) Missouri Public Service (MPS)
Alliant Energy West (ALT) City of Henderson, KY (HMPL) Missouri River Energy Svc (MRET)
American Transmission Co. (ATC) Hoosier Energy (HE) Northern IN Pub. Svc. Co. (NIPS)
City of Alexandria, LA (AXLA) Indiana Municipal Power Agency (IMPA) Xcel Energy (NSP)
Basin Electric Power Cooperative (BEPM) Indianola Municipal Utilities (IMU) Northwestern Wisconsin Electric Company (NWEC)
Big Rivers Electric Corp (BREC) Indianapolis Pwr & Light (IPL) Otter Tail Power (OTP)
Citizens Electric Corporation (CECT) 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) Republic Transmission, LLC (RTX)
Cleco Power LLC. (CLEC) Municipal Energy Agency of Nebraska (MEAN) SIGE-Vectren (SIGE)
Central Minnesota Municipal Power Agency (CMMPA) MidAmerican Energy Co (MEC) Southern Illinois Power Cooperative (SIPC)
Columbia Water & Light (CWLD) Michigan Elec Trans Co (METC) Southern Minnesota Municipal Power Agency (SMPT)
City Water, Light & Power (CWLP) Manitoba Hydro Elec Board (MHEB) South Mississippi Electric Power Association. (SMEPA)
City Water and Plant of the City of Jonesboro (CWLT) Missouri Electric Commission (MEC1) 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)
    Wabash Valley Power Association (WVPA)