Firefighters from four departments converged on the manufacturing company that takes up the block at 1333 Fulton Ave. after the 10:47 a.m. call.
At least one employee said he heard an explosion, and another employee making cam shafts in the facility said a transformer had blown.
Officials reported that two people were working in the area at the time, but neither of them were injured.
More than 80 people were working at the time and all evacuated safely, said plant manager Scott Huyser.
The transformer blew where power comes into the building from a set of transformers just across a driveway, said Chief Jeff Hawke, director of the Grand Haven Department of Public Safety.
Huyser said they would bring in portable power, but the facility would probably be closed down for at least a couple of days.
Engine Power Components manufactures engine camshafts and balance shafts.
Stay tuned to www.grandhaventribune.com for updates on this breaking news situation.