Ameren Illinois Co an Illinois corporation is a subsidiary of Ameren Corporation. It operates a rate-regulated electric and natural gas transmission and distribution business in Illinois. It supplies electric and natural gas utility service to portions of central and southern Illinois having an estimated population of 3.1 million in an area of 40,000square miles. It supplies electric service to around 1.2 million customers and natural gas service to almost 806,000 customers.
Collinsville, IL, 62234