American Electric Power will stop burning coal at three power plants, including one in Ohio, under a revised federal clean-air agreement unveiled Monday.

The Columbus-based utility must retire or refuel Unit No. 5 at the Muskingum River Power Plant at Beverly in Washington County by 2015.

Also being closed or refueled by that time will be Tanners Creek Generating Station No. 4 in Lawrenceburg, Ind., and the iconic Big Sandy Power Station No. 2 in Louisa, Ky., is to be retired.