Ameren Illinois Company

Ameren Illinois Company, widely known as Ameren Illinois, is an Illinois-based utility that focuses on the rate-regulated generation, transmission, and distribution of electricity. The company further extends its operations to include natural gas distribution services. It caters to a substantial customer base, supplying electric services to approximately 1.2 million individuals and businesses, and natural gas services to 0.8 million customers, across a vast 43,700-square-mile territory that covers central and eastern Illinois. The organization, which was established in 1902, previously operated under the name Central Illinois Public Service Company before it was rebranded as Ameren Illinois Company in October 2010. Its corporate headquarters are situated in Collinsville, Illinois, and it functions as a subsidiary of Ameren Corporation.