AMEREN CORP revenue for the last year amounted to 158.94 B MXN, the most of which — 82.56 B MXN — came from its highest performing source at the moment, Ameren Missouri, the year earlier bringing 64.97 B MXN. The greatest contribution to the revenue figure was made by United States — last year it brought AMEREN CORP 158.94 B MXN, and the year before that — 127.39 B MXN.