Central Illinois Light

CILCORP Inc. is an Ameren Corporation subsidiary that operates as a holding company for Central Illinois Light Company ("CILCO") and a non-rate- regulated subsidiary. CILCO operates a rate-regulated electric and natural gas transmission and distribution business and a non-rate-regulated electric generation business through its subsidiary, AmerenEnergy Resources Generating Company, all in Illinois. CILCO supplies electric and gas utility service to portions of central and east central Illinois in areas of 3,700 and 4,500 square miles, respectively, with an estimated population of 1 million. CILCO supplies electric service to 210,000 customers and natural gas service to 213,000 customers. AmerenEnergy Resources Generating Company owns 1,074 megawatts of coal-fired electric generating capacity and 55 megawatts of natural gas and oil-fired electric generating capacity.