California could lose up to 17pc of its refining capacity within a year, triggering major concerns about its tightly supplied and frequently volatile products market.

US independent Valero announced on 16 April that it will shut or repurpose its 145,000 b/d Benicia refinery near San Francisco by April 2026. The firm is also evaluating strategic alternatives for its 85,000 b/d Wilmington refinery in Los Angeles. And independent Phillips 66 said in October that it would shut its 139,000 b/d Los Angeles refinery in the fourth quarter of this year.

Valero’s Benicia announcement brought a quick reaction from state officials. Governor Gavin Newsom on 21 April urged regulators at the California Energy Commission (CEC) to work closely with refiners through “high-level, immediate engagement” to make sure Californians have access to transport fuels. He has ordered them to recommend by 1 July any changes to California’s approach that are needed to ensure adequate fuel supply during its energy transition.

The message appears to have hit home. The CEC delayed a vote on new refinery resupply rules to provide time for additional feedback and consultation with stakeholders after the Valero announcement. The CEC also plans to introduce a rule this year for minimum inventory requirements at refineries in the state as well as possible rules on setting a refiner margin cap.

The new rules are part of an effort by Newsom to mitigate fuel price volatility in California, including the signing of two pieces of legislation known as AB X2-1 and SB X1-2. Refiners have been unhappy with the state’s regulatory and enforcement environment for some time. It is “the most stringent and difficult” in North America owing to 20 years of policies pursuing a move away from fossil fuels, Valero chief executive Lane Riggs says.

The long and short of it

Refinery closures are fuelling long and short-term supply concerns in California. The most immediate is an anticipated supply crunch at the end of this summer. Phillips 66’s plan to shut the Los Angeles refinery by October will deal a significant blow to the state’s refining capacity and is likely to occur at a time when Californian gasoline prices are most prone to volatility.

The US west coast is an isolated market, many weeks sailing time from alternative supply sources in east Asia or the US Gulf coast. California’s strict product specifications further limit who can step in when refinery output falls. The state sometimes sees price spikes in late summer and early autumn because the switch from summer gasoline blends leaves local inventories low while in-state refineries adjust to producing winter grades.

California gasoline prices spiked in September 2022 when stocks fell to a nine-year low on the west coast. Spot deliveries hit a record $2.45/USG premium to Nymex Rbob futures in the Los Angeles market at the time (see graph). Production problems at several refineries in southern California led to another spot price surge in September 2023. The California Air Resources Board (Carb) permitted an earlier switch to cheaper winter gasoline production in response to both events.

Refinery closures will force California to rely on imports in the longer term, leaving the state exposed to stretched supply lines. State regulators’ proposed solutions have raised eyebrows. The CEC’s Transportation Fuels Assessment report in August last year included a policy option in which California would buy and own refineries, which the state is not pursuing. Another option involves state-owned products reserves to allow rapid deployment of fuel when needed. The CEC and Carb regulators will also release a draft transportation fuels transition plan later this year.

By Eunice Bridges and Jasmine Davis , Argusmedia, 05 May 20205.