AEP Ohio,
Alabama Power Company,
Alleghany Power,
Alliant-IPL,
Ameren Illinois Utilities,
Ameren Missouri,
Arkansas Oklahoma Gas Corporation,
Baltimore Gas & Electric Company,
Black Hills Energy,
Board of Public Utilities,
Bonneville Power Administration,
Centerpoint Energy Arkansas Gas,
Commonwealth Edison Company (ComED),
Consumers Energy Company,
Connecticut Energy Conservation Management Board,
Delaware Sustainable Energy Utility,
Delmarva Power & Light,
Detroit Edison Company,
Michigan Consolidated Gas Company,
Dominion North Carolina Power,
DP&L,
Duke Energy,
Duquesne Light,
Efficiency Maine,
Efficiency United,
Efficiency Vermont,
Empire District Electric Company,
Entergy Arkansas,
Entergy New Orleans,
Energy Trust of Oregon,
Eummot,
Florida Public Service Commission,
Hawaii Public Utilities Commission,
Idaho Power,
Kansas City Power & Light,
Long Island Power Authority (LIPA),
Louisiana Department of Natural Resources,
NSTAR,
National Grid,
Massachusetts Cape Light Compact,
Massachusetts Department Of Energy Resources,
Massachusetts Energy Efficiency Advisory Council,
Maryland Public Service Commission,
Metropolitan Edison Company,
Michigan Electric Cooperative Association,
Mid-American Energy,
Nevada Power Company,
New Hampshire Utilities,
Northwestern Energy,
New York State Energy Research and Development Authority (NYSERDA),
Oklahoma Corporation Commission,
Oklahoma Gas and Electric Company,
Pacific Power,
PacifiCorp,
Peco Energy Company,
Pennsylvania Electric Company,
Pepco,
PNM,
Potomac Edison,
PPL Electric Utilities,
Postal Regulatory Commission (PRC),
National Association of Regulatory Utility Commissioners (NARUC),
Progress Energy Carolinas,
Maryland Public Service Commission (PSC),
Pennsylvania Public Utility Commission,
Public Utilities Commission of Ohio (PUCO),
Puget Sound Energy,
Rhode Island Energy Efficiency and Resource Management,
RMP,
Rocky Mountain Power,
Salt River Project,
Sierra Pacific Power Company,
Southern Maryland Electric Cooperative (SMECO),
SourceGas Arkansas,
South Carolina Electric & Gas,
Southwestern Gas Corporation,
Southwestern Electric Power Company,
State Corporation Commission,
Tennessee Valley Authority (TVA),
Toledo Edison,
Ohio Edison,
United Illuminating,
West Pen Power Co,
Xcel Energy