Why It Matters
Arizona drivers are facing some of the steepest gasoline prices in the nation as the ongoing U.S. conflict with Iran continues to disrupt global oil markets. In response, the U.S. Environmental Protection Agency has announced an emergency measure to expand availability of E15 ethanol-blended fuel through the summer months, a move aimed at increasing fuel supply and providing relief at the pump across Arizona and the rest of the country.
The decision carries direct consequences for Arizona consumers, who are already paying well above the national average for both regular gasoline and diesel fuel.
What Happened
EPA Administrator Lee Zeldin announced Wednesday that the agency would allow gas stations to sell E15 — a gasoline blend containing 15% ethanol — during the upcoming summer season. Under normal federal regulations, E15 sales are restricted in many states during summer months due to concerns that the fuel blend contributes to smog formation in warmer temperatures.
The EPA characterized the action as an emergency measure, citing the sharp rise in fuel prices driven by disruptions to global oil markets stemming from the U.S. conflict with Iran. The agency issued the waiver to boost available fuel supply and expand consumer options at the pump.
“EPA is working with our federal partners to reduce unnecessary costs and uncertainty and ensure that gas prices remain affordable for all Americans through the summer,” Zeldin said in a statement. “This emergency action will provide American families with relief by increasing fuel supply and consumer choice.”
Ethanol, the primary additive in E15, is produced from corn and other plant-based materials, making it a domestically sourced fuel component. The announcement drew bipartisan support, particularly from corn-producing Midwestern states that have long advocated for expanded ethanol blending rules.
By the Numbers
The scale of recent price increases underscores the urgency behind the EPA’s move. According to AAA data, the national average for a gallon of regular gasoline has risen by $1.00 in a single month, reaching $3.98 per gallon.
Arizona’s situation is more severe. The state’s average price for regular gasoline currently sits at $4.63 per gallon — $1.37 higher than it was just one month ago and 20 cents higher than just last week alone.
Diesel prices in Arizona have seen even more dramatic increases. The statewide average for diesel has climbed from $3.64 per gallon one month ago to $5.81 today — a jump of more than $2.17 in 30 days. That figure is more than 40 cents above the current national diesel average of $5.38 per gallon.
Seven Midwestern governors signed a joint letter to Administrator Zeldin on March 6 requesting the summer E15 waiver, reflecting broad regional support for the policy.
Zoom Out
The EPA’s emergency E15 waiver is not without precedent. The federal government has issued similar waivers in recent years, though typically on a case-by-case basis rather than as a response to wartime oil market disruptions of this scale. The Iran conflict has introduced significant volatility into global crude oil supply chains, affecting fuel prices far beyond the Middle East and placing pressure on domestic energy policy across multiple federal agencies.
The move reflects a broader national debate over ethanol policy. Corn-state officials from both parties have pushed for years to make year-round E15 sales permanent, arguing that the fuel reduces dependence on foreign oil and supports domestic agriculture. Minnesota Sen. Amy Klobuchar, the top Democrat on the Senate Agriculture Committee, endorsed the EPA action on March 19, stating that expanded E15 availability would “help lower costs and decrease our dependence on foreign oil.”
Nebraska Republican Rep. Adrian Smith also praised the announcement and called on Congress to codify the policy permanently, signaling that legislative action may follow the emergency administrative measure.
Ethanol industry groups have applauded the waiver, viewing it as both a near-term market opportunity and a step toward permanent regulatory reform.
What’s Next
The EPA’s emergency waiver is expected to take effect ahead of the traditional summer driving season, giving gas stations in affected states the opportunity to offer E15 blends at the pump during months when the fuel is normally restricted. Retailers will need to ensure their equipment is certified to dispense E15 before making the fuel available to consumers.
On the legislative front, calls from members of Congress such as Rep. Smith suggest that proposals to permanently lift the summer E15 restriction could advance in upcoming sessions. Whether Congress acts before the summer season remains to be seen. Arizona drivers, meanwhile, will be watching closely to see whether expanded ethanol supply translates into measurable relief at fuel stations across the state.