“We’re surprised just because it was unexpected, given that prices typically have declined,” said Devin Gladden, spokesperson for AAA. “That just speaks to the unprecedented nature of how many refineries were down and how tight supply was that ultimately gave rise to the price increase.”
Most refineries perform planned maintenance in the fall or winter, which usually does not affect gas prices because the refineries can work around the repairs. They may buy gasoline ahead of time knowing that their facilities will be producing less of it, for example.
But over the past two weeks, several refineries that supply the West Coast with gasoline had unexpected outages at the same time, which further hampered California’s ability to produce fuels.
At most, seven of the region’s 25 refineries were either down or at a lower production capacity, Gladden said.
“To see several refineries have unexpected outages at the same time, it’s not normal,” said Patrick DeHaan, head of petroleum analysis at Gas Buddy.
More than other states, California gas prices can sometimes skyrocket, because the state mandates cleaner gas with fewer emissions. That makes California gas cost more to refine, because it’s a special oxygenated blend that meets the state’s strict air-quality rules. Refineries have to use a specialized process, and only a few refineries are able to make California-approved gas, which makes it harder for the state to import oil.
However, the price increases are slowing as refineries work to resume production capacity. Assuming no additional outages, DeHaan expects California pump prices to stabilize toward the end of the week.