ABB
American Electric Power
American Transmission Company
AREVA T&D
Arizona Public Service
Bonneville Power Administration
British Columbia Transmission Co. (BCTC)
California Independent System Operator (CAISO)
CenterPoint Energy
Duke Energy
Entergy
EPRI
Exelon
FirstEnergy Corporation
GE Energy
Institut de Recherche d'Hydro-Québec (IREQ)
ISO New England

ITC Holdings
MidAmerican Energy
Midwest Independent System Operator (Midwest ISO)
National Grid USA
National Rural Electric Cooperative Association (NRECA)
New York Independent System Operator (NYISO)
New York Power Authority
Pacific Gas and Electric Company
PJM Interconnection
PowerWorld Corporation
Salt River Project
Siemens
Southern California Edison
Southern Company
Tennessee Valley Authority
Tri-State Generation and Transmission
U.S. Department of Energy
Western Area Power Administration