Lead
On March 25, 2026, the Environmental Protection Agency announced a temporary federal waiver to allow broader sales of higher-ethanol gasoline as U.S. pump prices spiked amid the war with Iran. The waivers lift limits that normally restrict E15 sales in many states during summer months and remove federal impediments to E10 in certain jurisdictions, effective May 1 through May 20. EPA Administrator Lee Zeldin said the move aims to keep fuel flowing and give Americans more options while the agency and industry monitor supplies. The administration also signaled separate steps to boost diesel availability, which has risen even more sharply at the pump.
Key takeaways
- The EPA will temporarily allow the sale and distribution of gasoline containing roughly 9%–15% ethanol, effectively easing seasonal limits on E15 in many markets from May 1 to May 20, 2026.
- E15 — gasoline blended with 15% ethanol — is normally restricted in about half of U.S. jurisdictions from June through September to limit air pollution; the waiver expands retail options ahead of summer.
- The agency also removed federal barriers to selling E10 in some places where state rules had complicated distribution.
- Federal action was announced at S&P Global’s CERAWeek conference in Houston, Texas, where EPA Administrator Lee Zeldin spoke publicly about the waivers.
- Since the U.S. war with Iran began, regular gasoline prices have risen roughly 30% to $3.98 per gallon, while diesel has climbed about 40% to $5.37 per gallon, according to AAA data.
- Energy Secretary Chris Wright told CNBC the administration has plans to add diesel supply to the market in coming weeks.
- The waivers are temporary and may be extended if supply conditions warrant further federal action.
Background
Federal gasoline regulations include seasonal restrictions on higher-ethanol blends to limit summertime air pollution in regions where temperature-driven ozone formation is a concern. Historically, those rules restrict sales of E15 during the June–September ozone season in many states, while E10 is widely available year-round. In supply disruptions, administrations have at times used emergency waivers to loosen federal restrictions so refiners and retailers can move fuel more flexibly to where it is needed.
Supply strains accelerated after the outbreak of armed conflict between the U.S. and Iran, which disrupted crude flows and elevated global oil market volatility. Refiners, wholesalers and retail chains have been adjusting inventory and distribution patterns as prices climbed. Key stakeholders include federal and state regulators, ethanol producers, refiners, fuel retailers and fleets that rely heavily on diesel for freight and logistics.
Main event
The EPA announced the waivers at the S&P Global CERAWeek conference in Houston, saying the agency will suspend federal enforcement of certain state fuel requirements and allow production and distribution of gasoline with ethanol content between 9% and 15%. The action is meant to broaden the supply of road fuel available to consumers and retailers during an acute market disturbance tied to the Iran war.
Administrator Lee Zeldin said the waivers will take effect on May 1 and remain in place through May 20, with the possibility of extension if ongoing conditions make it necessary. The agency indicated it will monitor supply with industry partners and other federal agencies to assess whether additional steps are required.
Separately, Energy Secretary Chris Wright told CNBC the administration is pursuing measures to expand the diesel supply, reflecting concern about diesel’s outsized price increase and its central role in freight and goods movement. Federal officials declined to detail all operational options but said they expect additional diesel to reach the market in the near term.
Analysis & implications
The waiver can increase short-term retail fuel availability by allowing refiners and distributors to blend and ship a wider range of ethanol blends to stations that can accept them. That additional flexibility may blunt some price pressure, particularly where ethanol-blend fuel is abundant and distribution bottlenecks are the binding constraint. However, the magnitude of any downward price effect will depend on logistics, regional storage, and retail station compatibility.
Environmental and technical trade-offs matter. Seasonal restrictions on E15 were originally put in place to reduce summertime ozone formation in certain climates. Loosening those limits temporarily raises questions about local air-quality impacts, which will vary by region and by the scale of E15 uptake. The waiver is framed as an emergency response rather than a permanent regulatory change, limiting long-term precedent concerns.
Consumer and vehicle-compatibility issues are also relevant. Most newer vehicles are designed to tolerate E10 without warranty issues, but E15 compatibility can vary by model year and engine type. Retailers and states will need to manage labeling and station-level logistics to minimize misfuelling risks. Meanwhile, diesel remains a separate challenge: even with gasoline supply eased, diesel prices and availability will largely depend on refinery output, blending capacity and strategic stock releases.
Comparison & data
| Fuel | Current price | Approx. increase since Iran war |
|---|---|---|
| Regular gasoline | $3.98 / gallon | ~30% |
| Diesel | $5.37 / gallon | ~40% |
The numbers above reflect national averages reported by AAA and illustrate why federal officials prioritized steps to broaden what fuels can be sold. Regional price swings can be materially larger, especially in areas more exposed to distribution constraints or with local refinery outages.
Reactions & quotes
“EPA waivers will work to prevent disruption in America’s fuel supply by keeping E15 and E10 on the market and giving Americans more fuel options.”
Lee Zeldin, EPA Administrator, at S&P Global CERAWeek (official statement)
This quote accompanied the agency’s description of immediate steps to ease supply tightness while federal and industry partners continue monitoring market conditions.
“We do have some ideas on diesel, that we can bring extra diesel to the marketplace. I think we’ll see that happen before too long.”
Chris Wright, U.S. Energy Secretary, in CNBC interview (federal official)
Secretary Wright’s remarks signaled parallel efforts to boost diesel supply, a key concern for freight movement and supply chains given diesel’s larger price increase.
Unconfirmed
- Whether the waivers will be extended beyond May 20, 2026 is undecided and will depend on evolving supply data and interagency assessment.
- The precise effect of expanded E15 sales on local ozone levels and emissions this summer is not yet confirmed and will vary by region and uptake rates.
Bottom line
The EPA’s temporary waiver is a targeted, short-term effort to widen fuel options and ease distribution bottlenecks amid sharp price increases driven by the Iran conflict. It prioritizes immediate supply flexibility over long-term regulatory change and is explicitly framed as contingent on market conditions and further monitoring.
For consumers, the waiver may modestly increase station-level options and help stabilize pump prices in some regions; however, diesel supply and prices—critical for freight and goods movement—remain a separate pressure point that the administration is actively addressing. Watch for state-level implementation details, station labeling updates, and any announcement on extending the waiver past May 20.