Story is still unfolding about exacts. Mercury News reporting the following. Click the link above for the full story.

Also, the fire started with hazardous materials. Most importantly they were outside the factory.

Tesla Built Their Own EV and a fire started at freemont factory

By LEONARDO CASTAÑEDA

lcastaneda@bayareanewsgroup.com| Bay Area News Group

PUBLISHED: February 16, 2019 at 9:39 pm
UPDATED: February 16, 2019 at 10:07 A structure fire broke out at approximately 8:25 p.m. Saturday at the Tesla factory on the 45500 block of Fremont Blvd. The fire started in addition in a storage area in the exterior of the factory. Thereby and according to Fremont Deputy Fire Chief Amiel Thurston.
As well, the fire started in a 10 foot by 10 foot area containing hazardous waste in an exterior storage area, Thurston said. Finally, the fire department sent a hazardous materials unit to help contain the fire, he said. Furthermore, as I get more updates, we will report.
However as CNBC reports, while Tesla can manage some fires with its own internal brigade, the one on Saturday was contained within a few hours by the local Fremont Fire Department. Also it required a hazardous materials unit, Fremont Deputy Fire Chief Amiel Thurston told the East Bay Times.
In conclusion, Tesla confirmed that no employees were injured and the fire would not impact vehicle production.

The company has a history of frequent fires at this facility, including a significant one at its paint shop in April last year that temporarily halted electric vehicle production, and another outdoor fire (near a tent on the south side of the factory) in August.

This latest fire comes at a time when Tesla is defending its workplace safety record before California’s Division of Occupational Safety and Health.

Source: CNBC