Police reported there was no leak, and the chlorine was some leftover in a line.
Emergency crews responded to the Harbor Island plant at 4 p.m.
The victim walked out to the ambulance, before he was placed on a stretcher and taken to the hospital.
This is the second time in two days emergency crews responded to the local power plant.
Grand Haven Department of Public Safety Lt. Clint Holt reported that crews responded at 6:38 a.m. Sunday to a chlorine gas leak at the plant located at 1231 N. Third St.
Holt said the leak was small in nature and contained to the gas tank storage room. There was no threat to the public.
Two BLP employees who complained of possible chlorine gas inhalation were treated at the scene and released, he said.
The Ottawa County HAZMAT team also responded.
Crews cleared the scene just before 9 a.m. Sunday.
The cause of the leak is under investigation.