The Missouri Public Service Commission has approved a filing made by Ameren Missouri to adjust the fuel and purchased power adjustment charge (FAC) on the bills of its electric customers. Ameren Missouri made two filings with the Commission. For a residential customer using 1,000 kWh (kilowatt-hours) of electricity a month, the FAC will increase by approximately $0.40 a month, from a current refund of approximately $1.76 a month to a refund of approximately $1.36 a month. The change is expected to take effect on September 24. The FAC tariff allows the company to pass increases or decreases in its net fuel and purchased power costs to customers outside of a general rate case. The FAC allows the company to recover up to 95 percent of its costs to encourage conservation and prudence in fuel use by the company. Any charges resulting from the fuel adjustment clause must appear in a separate category on customers’ bills. Fuel adjustment charges are intended to help companies deal with volatility in fuel pricing. The FAC tariff requires regular adjustments to reflect changes in prices the company has incurred for fuel and for wholesale power purchased to serve customers.