Ameren Missouri is part of St. Louis-based Ameren Corporation, with a generating capacity of 10,500 megawatts. Ameren Missouri has been providing electric and gas service for more than 100 years, and our electric rates are among the lowest in the nation. Ameren Missouri's mission is to power the quality of life for our 1.2 million electric and 132,000 natural gas customers in central and eastern Missouri.