Learn about Ameren Illinois

Ameren Illinois


Ameren Illinois is a regulated electric and gas delivery company based in Collinsville, 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 816,000 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, 46,000 miles of distribution lines, 18,200 miles of natural gas transmission and distribution mains and 12 underground natural gas storage fields with a total capacity of approximately 25 billion cubic feet.

Senior Management
Our leaders guide Ameren Illinois in initiatives focused on safety, reliability and energy efficiency. 
Infrastructure Improvements
Our plan to make your service safer, more efficient and more reliable.
Energy Efficiency
Ameren Illinois helps home owners and business people use less and spend less.
Rates and Regulations
Learn more about rates and how they change when our costs rise to enable us to reliably get power to you. 
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