With assets of $24 billion, Ameren serves approximately 2.4 million electric customers & almost one million natural gas customers in a 64,000 square mile area of Missouri & Illinois. Ameren ownes a diverse mix of electric generating plants strategically located in its Midwest market with a generating capacity of 16,800 megawatts. AmerenCIPS, Amer CILCO &z AmerenP are the electric operating companies serving central & southern Illinois. Click the link above for information about competitive energy rates, labor & demographic profiles, innovative industrial building programs & building/site inventories. At Ameren, development fuels the community. We fuel the development.