· American Electric Power

· Aquila

· Arizona Public Service

· Baltimore Gas & Electric

· Bonneville Power Administration

· British Columbia Hydro

· Central Maine Power

· Cinergy

· Consolidated Edison

· Conectiv Power

· Consumers Energy

· Detroit Edison

· Dominion Power

· Duke Energy

· Duquesne Electric Power

· Entergy

· Exelon Corp. (Formerly Commonwealth Edison and PECO Energy)

· First Energy Corp.

· Green Mountain Power

· Hawaiian Electric Industries

· Hydro QuÈbec

· Illinois Power

· Indianapolis Power & Light

· Kansai Electric Power ( Japan )

· Kansas City Power & Light

· LG&E Energy

· Long Island Power Authority

· Maine Public Service

· Minnesota Power

· National Grid Co. ( U.K. )

· New York Power Authority

· New York State Electric & Gas

· Northeast Utilities

· NorthWestern Energy

· NSTAR ( Boston Edison)

· Ontario Hydro Energy

· Orange and Rockland Utilities

· PacifiCorp

· PPL Corp. ( Pennsylvania Power & Light)

· PSE & G

· San Diego Gas & Electric

· Scottish Power ( U.K. )

· Select Energy (formerly Niagara Mohawk)

· Southern California Edison

· Southern Company

· Tampa Electric

· Tennessee Valley Authority

· TXU Electric & Gas (Formery Texas Utilities)

· Tokyo Electric Power ( Japan )

· TransAlta Utilities ( Canada )

· Union Electric

· United Illuminating

· Wisconsin Public Service