Ameren Illinois Company

Ameren Illinois Company, which conducts business as Ameren Illinois, primarily handles the regulated generation, transmission, and distribution of electricity across Illinois. The firm additionally manages natural gas distribution operations. It supplies electrical services to 1.2 million clients and natural gas services to 800,000 clients throughout a 43,700 square-mile territory spanning central and eastern Illinois. Founded in 1902, the company was initially named Central Illinois Public Service Company, adopting its current designation, Ameren Illinois Company, in October 2010. This Collinsville, Illinois-based entity operates as a subsidiary of Ameren Corporation.