About Ameren Illinois
Ameren Illinois is a utility company based in Collinsville, Illinois. It provides electricity to more than a million customers and natural gas to over 800,000, located in 89 counties throughout Illinois. Ameren’s service territory covers approximately 3/4 of the state, including Peoria, Carbondale, and Springfield. Its parent company is Ameren, which also owns Ameren Missouri. Incorporated in 1995, Ameren merged three of Illinois’ utility companies into a single entity, Ameren Illinois, in 2004.