Ameren Illinois is a regulated electric and gas delivery company based in Peoria, Illinois. Our parent company is Ameren Corporation located in St. Louis, Missouri. As a delivery company, Ameren Illinois is in the business of energy distribution. All customers can choose their electric supplier, and non-residential customers can choose their gas supplier. 

Our service territory spans 43,700 square miles, or about three-quarters of the state. Every day, we deliver electricity to 1.2 million electric and 840,000 natural gas customers in central and southern Illinois. We deliver safe, reliable energy to more than 1,200 communities. Our complex delivery system includes about 4,500 miles of electric transmission lines, 45,400 miles of distribution lines, 18,000 miles of natural gas transmission and distribution mains and 12 underground natural gas storage fields.

Our senior leadership team guides Ameren Illinois in the planning, development and execution of initiatives focused on safety, reliability and energy efficiency. We’re proud of our past, and we’re invested in our future.