During 2015 Ameren Missouri presented to the public service commission a request for rate hikes. These increases are currently reflected in your Ameren Missouri bill. Any questions or concerns regarding this should be directed to Ameren Missouri. At Ameren Missouri Phone: 800.552.7583 PO Box 88068 Fax: 866.297.8054 St. Louis, MO 60680-1068 Hours: 7:00 a.m. – 7:00 p.m. M-F