JACKSON, Miss. — Mississippi Power Co. says it’s asking regulators for a rate increase next year to cover higher overall business costs, including higher costs for power plant fuel.

The unit of Atlanta-based Southern Co., the smaller of Mississippi’s two privately-owned electrical utilities, made filings Wednesday with the Mississippi Public Service Commission.

The move would boost monthly rates for a yardstick residential customer from about $135 a month to about $146 a month. About half the money would cover higher fuel costs, while about half would be an increase in basic rates.

Commissioners are likely to decide on increases early next year, at the same time they’re deciding how much the company’s 187,000 customers should pay for a power plant in Kemper County. Mississippi Power President Anthony Wilson says the issues are unrelated.