US set to approve expanded biofuel waivers as Senator Lee attacks the ethanol mandate
The Trump administration is expected to approve expanded biofuel waivers as early as Monday, according to Reuters sources. For anyone moving gallons, that is the item that matters this week, because waivers cut how much renewable fuel obligated parties have to blend, and that feeds straight into the RIN market.
The waivers
Small refinery exemptions let qualifying refiners off the hook for their Renewable Fuel Standard blending obligation. Grant more of them, or grant them for more gallons, and the pool of required RINs shrinks. Fewer buyers chasing the credits tends to take pressure off RIN prices, which is the cost side of the blending math for the blenders downstream. Reuters reported the expected approval on sources, so treat the timing and the scope as unconfirmed until EPA actually puts paper out.
The read for jobbers and blenders is simple. A bigger waiver pool is bearish for RIN values and eases compliance cost for refiners who lean on exemptions. It cuts the other way for ethanol producers and corn growers, who want the mandate demand held firm.
Lee goes after corn
Senator Mike Lee spent August 29 hammering the ethanol industry on X, and he was not subtle about it. He linked a Washington Post opinion piece by Heritage Foundation Executive Vice President Derrick Morgan calling for lower biofuel standards in gasoline, then posted that "Americans are getting screwed at the gas pump by Big Corn, which profits enormously from federal mandates requiring us to use corn to fuel our cars."
Lee also ran an X poll asking whether the government should "force us to drive corn-burning cars." Over 5,200 votes came back saying no. A social media poll is not policy, but it lands the same week EPA looks ready to widen exemptions, and it shows the RFS is drawing fire from inside the Republican coalition, not just from the usual refiner lobby.
Put the two together and the political wind is blowing against the mandate right now. That does not mean the RFS volumes get cut this year. It means the pressure to hold them steady is running into a louder pushback than it has in a while.
What to watch
Whether EPA actually issues the expanded waivers Monday, and if it does, how many gallons they cover, because that sets the size of the hit to RIN demand. Watch for a formal reaction from the ethanol groups and corn-state senators, who will fight any exemption expansion hard. And watch whether Lee's argument picks up other Republican votes or stays a one-man campaign. If it spreads, the 2026 RFS volume fight could get uglier than the trade expected.