Firefighters in La Crosse battled a fire at an Xcel Energy plant for over two hours last night.
They received the call just after 10:30.
When they got to the scene, they could see flames coming out of the roof.
Everyone working at the plant made it out safely.
Investigators are still trying to figure out exactly what caused the fire. The only damage was to a roof structure covering a chimney over a shredder.