 A Proterra bus in operation (File/ FOX Carolina)
A Proterra bus in operation (File/ FOX Carolina) 
 
 Firefighters investigate what caused 2 explosions in Proterra plant (FOX Carolina/ July 29, 2015)
Firefighters investigate what caused 2 explosions in Proterra plant (FOX Carolina/ July 29, 2015) 
 
 Smoke seen billowing from Proterra plant (FOX Carolina/ July 29, 2015)
Smoke seen billowing from Proterra plant (FOX Carolina/ July 29, 2015) 
 
 
GREENVILLE, SC (FOX Carolina) - 
 Greenville firefighters are investigating what 
caused two explosions and a bus fire inside the Proterra factory on 
Whitlee Court early Wednesday morning.
Firefighters were called to
 the facility about a possible explosion around 3:45 a.m and arrived to 
see heavy smoke inside the building.
Firefighters soon learned 
that two explosions had occurred in the back right side of the building 
and requested additional manpower.
Employees were inside the building when the explosions occurred and were safely evacuated, firefighters said.
EMS and Greenville police also responded to the scene.
Firefighters
 discovered a bus on fire inside the building and by 8 a.m. said all 
fires had been extinguished and they were working to ventilate the 
building.
Firefighters said the explosions and fires did not appear suspicious.
Proterra manufactures zero-emission electric buses.
Dairy Drive was closed to all traffic as firefighters investigated. Workers at PET Dairy are urged to enter that facility via Fairforest Way.