Ameren Illinois Company

Operating commercially as Ameren Illinois, Ameren Illinois Company is involved in the rate-regulated generation, transmission, and distribution of electricity throughout the state. The enterprise additionally manages natural gas distribution services. It provides electric power to 1.2 million consumers and natural gas to 0.8 million consumers within an expansive 43,700 square-mile territory covering central and eastern Illinois. Founded in 1902, the company initially traded as Central Illinois Public Service Company before adopting the name Ameren Illinois Company in October 2010. Headquartered in Collinsville, Illinois, it functions as a subsidiary of Ameren Corporation.