After receiving a $226 million rate hike, AmerenUE is back for more.

The state’s largest electric utility has asked the Public Service Commission for another 11% rate increase to finance improvements to the reliability of its electric grid and to reduce pollution at coal-fired plants. The PSC granted Ameren a 10% rate hike that took effect this summer. AmerenUE followed that up with a request for another $71 million to offset fuel-related expenses.

If granted, the rate increase would translate into another $9.30 on the average residential electric bill.

AmerenUE says it needs the money to complete improvements to the electric grid through February of next year. Much of the increase would cover the costs of installing two scrubbers at the Sioux coal-fired plant in St. Charles.