Fire officials believe the workers were injured during a flash fire that broke out while they were doing maintenance on a 2,300- volt panel, according to Kelley.
A flash fire ignites fast but doesn't continue to burn, Kelley explained.
A refinery spokesperson said the cause of the fire was under investigation.
Brissa Sotelo added that refinery operations continued normally and there was no effect to the surrounding community.
All four workers were transferred to hospitals.
The worker with the most serious injuries suffered burns to 60 percent of his hands and face, Kelley said.
Two had minor injuries and another man was listed in serious condition, Kelley said.
No other information was released about the workers, Sotelo said.
The refinery, along with a products terminal and 250 gas stations, is in the process of being sold by Shell to independent oil refiner Tesoro Corp. in a deal estimated to be worth $1.63 billion, according to an announcement by the companies last week.
Written by Daily Breeze
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