Marquette city firefighters are still investigating the cause of a blaze at the WE Energies power plant at Presque Isle.
The blaze started shortly before 9:30 Tuesday night on the roof of Building #4 at the plant.
The Marquette Fire Department says the flames were confined to a diesel exhaust ventilator that was being used in support of an asbestos abatement operation.
The fire was complicated by potential asbestos contamination of the firefighters; crews were decontaminated at the scene.
The diesel air handling unit was damaged during the fire.
No one was hurt.
The Marquette Township Fire Department, Marquette County Rescue 131 and MediRide EMS all assisted at the scene.