Member Companies

• Ameren Illinois
• Commonwealth Edison
• Illinois-American Water Company
• MidAmercian Energy Company
• Nicor Gas
• NRG Energy
• Peoples Gas and North Shore Gas
• Vistra

Associate Members

• Mt. Carmel Public Utility Company

Government Sites

• Illinois Commerce Commision
• State of Illinois - Legislature
• State of Illinois - Governor

Other Sites

• American Gas Association
• Edison Electric Institute
• Safe Electricity

Utility Maps and Legislative Districts

• Electric Utilities and Power Plants in Illinois with Senate and House Representative Boundaries
• Natural Gas Utilities in Illinois with Senate and House Representative Boundaries