E15: Fueling Energy Security and Farm Viability

By Faith Parum

Few markets link energy security and farm viability like ethanol. For more than two decades, it’s provided a reliable outlet for U.S. corn, strengthened domestic fuel supplies and saved consumers money at the pump. Global ethanol use has more than doubled since the early 2000s, underscoring its role in meeting fuel demand.

The U.S. is projected to produce 61.6 billion liters of ethanol and 18.6 billion liters of biodiesel and renewable diesel in 2025. But as gasoline demand declines with more efficient and electric vehicles, expanding E15 — gasoline blended with 15% ethanol — is critical to keeping markets strong for corn growers and lowering fuel costs for consumers. Year-round E15 sales could shape the future of ethanol demand and America’s energy independence.

Why E15 Matters

Ethanol uses about 5.6 billion bushels of corn annually — roughly one-third of U.S. production. Most gasoline today contains 10% ethanol (E10), but some states offer higher blends like E15 and E85. E15 burns cleaner than regular fuel, cutting tailpipe emissions by about 46% compared to straight gasoline, and offers higher octane for better engine performance.

Yet E15 growth is stalled by outdated rules. Each summer, federal volatility limits restrict E15 sales in many states, even though it performs as cleanly as E10. The EPA has issued temporary waivers for summer sales, including in 2025, but these must be renewed annually — creating uncertainty for retailers and slowing investment in E15 infrastructure.