Ameren Illinois Company

Operating as Ameren Illinois, the Ameren Illinois Company is involved in the regulated provision of electricity throughout Illinois, which includes generating power, transmitting it across grids, and distributing it to end-users. The company also handles the distribution of natural gas. It delivers electricity to approximately 1.2 million customers and supplies natural gas to around 0.8 million customers across a vast 43,700 square-mile region spanning central and eastern Illinois. Initially known as Central Illinois Public Service Company, the firm rebranded to Ameren Illinois Company in October 2010. Founded in 1902, its main offices are situated in Collinsville, Illinois. Ameren Illinois Company operates as a division of Ameren Corporation.