Customers of Ameren Missouri will see an increase on their bill by as early as February 1st. The Missouri Public Service Commission has approved a request filed by Union Electric Company/ Ameren Missouri to adjust the Energy Efficiency Investment Charge that appears on the monthly bills of Ameren Missouri electric customers. For a typical residential customer using 1,000 kilowatt-hours of electricity a month, the charge will increase from approximately $3.95 a month to approximately $5.32 a month, an increase of about $1.37 a month. The adjustment reflects the cost of approved energy efficiency programs under the Missouri Energy Efficiency Investment Act. The Energy Efficiency Charge is a charge which encourages utility companies to implement demand-side and energy efficiency programs. Ameren Missouri serves approximately 1.2 million electric customers in Missouri.