• AEP
  • Alabama Power
  • Ameren
  • Arizona Public Service
  • Basin Electric Power Cooperative
  • Consumers Energy
  • Dayton Power and Light
  • Dominion
  • DTE
  • Duke Energy
  • Dynegy
  • East Kentucky Power
  • ESKOM
  • FirstEnergy
  • Georgia Power
  • Gulf Power
  • Holland Board of Public Works
  • Indiana-Kentucky Electric Corp.
  • Indianapolis Power & Light
  • Korea Midland Power
  • Lakeland Electric
  • Lansing Board of Water & Light
  • LG&E/Kentucky Utilities
  • Michigan South Central Power Agency
  • Ohio Valley Electric Corp.
  • PacifiCorp
  • Prairie State Generating Company
  • Progress Energy
  • Santee Cooper
  • Sebewaing Light and Water
  • Southern Company
  • Springfield, IL City, Water, Light & Power
  • TVA
  • Vectren
  • Wisconsin Public Service
  • Wyandotte Municipal Service