Davis-Besse Nuclear Power Station is operating for the first time since February after repairs were made to cracks found in the nozzles of the reactor head.
Ohio-based utility FirstEnergy Corp. says the nuclear facility near Toledo began operating Tuesday.
This comes after federal regulators gave FirstEnergy permission to restart the Davis-Besse nuclear plant.
The utility has agreed to replace the reactor head next year, but regulators say they're confident the plant is safe to run.
The company says it found the early-stage cracks during a planned outage.
The plant was closed from 2002 to 2004 because of an acid leak in a different reactor head.