Calif. to Debut E15, Adding Fuel Choice Amid Market Volatility

MIAMI, FL (DTN)–California is preparing to introduce E15 gasoline, a 15% ethanol blend at gas stations statewide following Governor Gavin Newsom’s approval of Assembly Bill 30 (AB 30) earlier this year. The move marks the state’s most significant shift in retail fuel policy in more than a decade, aimed at providing drivers with a cheaper and cleaner gasoline alternative.

E15’s arrival also comes at a critical time for the U.S. West Coast fuel market, which has experienced persistent volatility this year. With refinery reliability issues, emergency flaring events, and fluctuating spot prices driving sharp week-to-week swings, the addition of E15 could gradually reshape how California manages both cost pressures and emissions in its transportation sector.

Throughout 2025, refinery disruptions have repeatedly roiled gasoline supply across the region. Chevron’s 269,000 bpd El Segundo refinery reported emergency flaring on October 6, following another incident between September 29 and October 1, according to regulatory filings with the South Coast Air Quality Management District. Shortly after the latest incident, the Los Angeles jet fuel differential widened sharply, moving from minus 9cts to 20cts above November NYMEX RBOB futures on October 6. While sources did not attribute that increase directly to El Segundo flaring, it underscores how sharply differentials can move within the USWC market. Similar events at other facilities have also tightened supply and sent CARBOB spot prices climbing and falling in wide, unpredictable intervals.

E15’s introduction represents a new layer of flexibility in this environment. The blend, already common in other U.S. markets, allows for slightly higher ethanol content, which can lower pump prices and extend gasoline supply without major refinery reconfigurations. According to a biodiesel market source, beyond cost relief, E15 advances California’s long term clean fuel goals by cutting carbon intensity and reducing dependence on crude oil.

“While the price difference between E15 and regular gasoline does fluctuate, it is still a cheaper, cleaner option,” the source told DTN, adding that broader adoption could help smooth price volatility and increase renewable fuel integration in the region.

California’s Air Resources Board continues to evaluate E15’s compatibility with the state’s strict air quality standards, and availability will roll out gradually. Still, with West Coast gasoline markets facing some of the highest volatility in the country, the introduction of E15 could mark an important step toward possibly stabilizing prices and advancing the state’s transition to lower carbon fuels.