Analysis: California E15 Decision Looms Amid Price Strain

SECAUCUS, NJ (DTN) – Soaring prices for gasoline in California, which could heighten as the Middle East conflict drags, have fundamentally shifted the economic landscape for the state’s impending decision on the E15 fuel.

What was once a slow-moving regulatory discussion now appears a priority, testing the resolve of the California Air Resources Board (CARB).

At the end of a two-day meeting on Friday (3/27), CARB is expected to decide whether to put the E15 at par with regular E10 gasoline, which contains 10% ethanol, or treat it as an alternative fuel.  

The California agency had a major regulatory path for the E15 cleared Wednesday (3/25) when the federal Environmental Protection Agency (EPA) approved the 15% ethanol blend as a 2026 summer season fuel.

The greenlight came in the form of a waiver granted for the E15 from having to meet strict emission standards during the summer under the RVP – or 1-psi Reid Vapor Pressure – ruling. RVP has been key in regulating gasoline with higher ethanol from causing more smog in high temperatures.

CARB regulators must still determine if the E15 meets the state’s own summertime RVP standards, although the EPA waiver could make it easier for the state to decide.

For California Governor Gavin Newsom, the E15 has always been about making fuel more affordable in the state, where pump prices for the regular E10 are already trending above $5 gallon, reaching even $8 in some parts of Los Angeles.

“Adding larger volumes of low-cost ethanol to gasoline is a proven solution for reducing fuel prices,” Renewable Fuels Association CEO Geoff Cooper said.

Prior to the EPA’s announcement on Wednesday, ethanol’s wholesale discount to gasoline stood at around $0.84 gallon – large enough to sell the E15 at a discount of least $0.20 to the E10 after refining costs. It is not known how much the difference could narrow here on as the ethanol industry tries to cash in on higher demand for the feedstock.

Also, if CARB designates E15 as an alternative fuel, fuel retailers will need entirely separate infrastructure to store and dispense the 15% blend, side by side with the E10. The cost of new tanks and pumps would make the transition a non-starter for independent station operators, especially the smaller ones.

Some also caution that over the longer run, the economics behind the E15 might not be as much as expected.

University of California Berkeley economics professor Aaron Smith notes that ethanol contains roughly 33% less energy than petroleum. The resulting 1% to 2% drop in mileage often nets out the retail price discount.

“Even if the extra ethanol in E15 were free to produce, the cost of production would only drop by about $0.13,” Smith noted in a December study.

Still, Stanford economist Ryan Cummings warns that a prolonged Middle East crisis could drive global crude benchmark Brent towards $140 bbl, bringing regular gasoline across California to near $7 gallon.

At such pricing, the E15 debate is no longer about marginal savings, but about the survival of the state’s fuel supply chain.