Five fire crews attended an emergency at Kilroot Power Station in Carrickfergus on Monday evening.
The alarm was raised at 8.34 pm.
A spokesperson for the Northern Ireland Fire and Rescue Service said: “Firefighters dealt with a fire involving a mechanism in a fan – accidental ignition.”
Two appliances from Carrick, one from Whitehead, one from Larne and one from Glengormley were called to the power station.
The alert ended at 9.10 pm.