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TUESDAY, AUGUST 04, 2026   |   SPECIAL REPORT & ANALYSIS

POLICY ANALYSIS  |  E15 & THE RFS

Senate’s E15 Trade Puts Billions of RINs on Big Oil — and a Bigger-Than-Expected SRE Wave Is Reportedly Coming

The farm bill’s reallocation language would shift exempted biofuel gallons onto large API refiners such as Chevron and Marathon, while sources say EPA’s 2025 exemption decision — due within weeks — may be larger than the market expects.
 

Analysis  ·  August 4, 2026

The year-round E15 language Senate Ag Chairman John Boozman (R-Ark.) folded into his revised farm bill on July 31 looks, at first glance, like the ethanol win corn-state senators have chased for a decade. But the provision that has oil-industry lobbyists working the phones ahead of Thursday’s markup is not the E15 authorization itself — it is the reallocation mandate that travels with it. By requiring EPA to shift most future exempted small-refinery gallons onto non-exempt refiners, the Senate language would concentrate billions of RINs of compliance obligation on the American Petroleum Institute’s largest members, including Chevron and Marathon Petroleum. And according to sources watching the process closely, the impact on those companies is very, very big.

Under the Senate approach, exempted gallons no longer disappear — they move. And above a 500-million-gallon cushion, they move onto the biggest refiners in the country.

What the Senate language actually does

Section 12501 of the revised Agricultural Act of 2026 pairs permanent, nationwide year-round E15 sales with a wholesale rewrite of the Renewable Fuel Standard’s small refinery exemption (SRE) program. The petition-by-petition system ends after 2027, replaced by an automatic, production-based carve-out for refineries averaging 75,000 barrels per day or less. A refinery that exceeds the threshold in 2028 or later is permanently ineligible — a one-strike rule — and future exemption levels are capped at the highest amount a refinery claimed during 2023-25. EPA must resolve every outstanding petition by October 2028.

The pivotal clause is the reallocation mandate: most exempted renewable-fuel obligations are redistributed to other obligated parties, with EPA barred from reallocating only the first 500 million gallons. That is a sharply different trade than the House-passed bill API helped negotiate in May, which prohibited EPA from shifting waived gallons to other refiners, defined “small” at 10,000 barrels per day, and handed qualifying refiners a 75% cut in RFS obligations starting in 2028. Table 1 lays out the contrast.

Table 1. How the House and Senate bills treat E15 and small refinery exemptions. 

Why Chevron and Marathon feel the hit

Reallocation is not an abstraction — EPA has already shown what it looks like in dollars and RINs. The agency’s March 27 final rule set 2026 and 2027 renewable volume obligations at 26.81 billion and 27.02 billion RINs and ordered 70% of the volumes exempted for 2023-25 reallocated into those two years’ mandates — roughly 0.99 billion extra RINs in 2026 and 1.04 billion in 2027 (Figure 1). Because exempted small refineries by definition do not bear those gallons, the make-up obligation lands on the non-exempt majors. Chevron and Marathon, among the largest purchasers of RINs in the compliance market, absorb an outsized share of every reallocated gallon — at a moment when record-high 2026 mandates have pushed the value of an exemption, and the cost of covering someone else’s, to unprecedented levels.

Figure 1. EPA’s March 27 final rule folds 70% of 2023-25 exempted volumes back into the 2026-27 mandates that non-exempt refiners must meet. Sources: EPA; Ag Bull Trading; Growth Energy.

That math explains API’s rejection of language that pairs the E15 prize it has long said it could accept with a reallocation burden its biggest members must finance. “The proposal included in the Senate farm bill fails to deliver that balanced approach, replacing it with flawed provisions that weaken America’s fuel supply,” said Kristin Whitman, API’s senior vice president of government relations. Farm groups read the same language and see insurance: the American Farm Bureau Federation’s Zippy Duvall urged passage, National Corn Growers Association President Jed Bower called year-round E15 “a top priority,” and Growth Energy estimates nationwide E15 could add 2.4 billion bushels of annual corn demand.

The next shoe: a 2025 SRE surprise

The legislative fight is unfolding against a live administrative one. On Monday, under a court deadline flowing from the D.C. Circuit’s April 7 ruling in Alon Refining Krotz Springs v. EPA, the agency decided six petitions from four refineries covering 2023-24: one full exemption, two partials, three ineligible — and, notably, zero denials. Delek US’s Alon Krotz Springs, Louisiana, plant won a full 2024 exemption, while HF Sinclair’s Parco refinery and United Refining each received partial 2024 exemptions. Three additional HF Sinclair petitions — two for 2023 and one for 2024 — were ruled ineligible, and EPA withheld the refinery-specific appendices as confidential business information. 

The 2024 grants lift roughly 160 million RINs of obligation off the winners, and EPA will reverse their compliance retirements — returning all retired RINs to the full-exemption recipient and half to the partial winners — injecting usable credit supply just ahead of the Sept. 1 compliance deadline. Traders read the package as refinery-friendly and modestly bearish for near-term RIN prices, but not as bearish as some previously thought EPA would grant more exemptions. 

Just as telling is what EPA did not do Monday: it announced no reallocation of the newly waived 160 million RINs and left the 2026-27 percentage standards untouched. For now, those gallons are simply lost ethanol and biodiesel demand — precisely the outcome the Senate’s mandatory-reallocation language is written to foreclose, and a preview of the stakes if the 2025 decision lands big. Monday’s action follows the August 2025 backlog clearing in which EPA decided 175 petitions from 38 refineries, granting 140 of them in whole or in part (Figure 2) and exempting 5.34 billion RINs across compliance years 2016-24.

Figure 2. EPA’s August 2025 decisions granted 140 of 175 SRE petitions — an 80% grant rate. Sources: EPA; Growth Energy.

What EPA has never decided is the 2025 compliance year, because refineries could not submit the required financial data until October 2025. Those petitions are now ripe. 

Keep an eye on the next couple of weeks: sources indicate a 2025 SRE announcement is coming — and that the number of exemptions will be larger than the market expects. A big 2025 grant would matter twice over. First, the March rule’s 70% reallocation formula reaches 2025 exemptions, so every additional waived gallon mechanically inflates the make-up volumes non-exempt refiners must cover in 2026-27. Second, under the Senate bill each refinery’s future automatic carve-out is capped at its highest 2023-25 exemption — making a generous 2025 decision the high-water mark that gets locked in for the life of the new regime. The bigger the 2025 number, the bigger both the immediate RIN bill for the majors and the permanent baseline for small-refinery relief.

Markup math and what to watch

Thursday’s 9:30 a.m. farm bill markup is its own cliffhanger. The committee sits 11-11 with Sen. Mitch McConnell absent, so Boozman needs at least one Democrat to report the bill and roughly seven for 60 votes on the floor. The manager’s amendment — expected Wednesday or markup morning — is the tell: a joint Boozman/Klobuchar (D-Minn.) package signals a live path to the floor before current farm law expires Sept. 30; a chairman-only package points toward another one-year extension. Ranking member Amy Klobuchar has not formally responded to the revised text, which also softened the SNAP state cost-share timeline by one year to buy Democratic votes. Watch, too, whether oil-state Republicans attempt to strip or rewrite the reallocation clause — that amendment fight, not E15 itself, is where the money is (Figure 3).

Figure 3. The decision calendar: EPA’s court-forced ruling, the Senate markup, an expected 2025 SRE announcement and the Sept. 30 farm-law expiration all land within eight weeks. Sources: EPA; Senate Agriculture Committee; author’s reporting.

Bottom line

The Senate’s E15 title is less a fuel-marketing change than a multi-billion-RIN transfer of RFS compliance costs from small refineries onto API’s largest members — which is why Chevron’s and Marathon’s trade association walked away from a deal built around its own priority. If the coming 2025 SRE announcement is as large as sources suggest, it will simultaneously raise the reallocation bill for the majors and lock in a richer permanent baseline for small refiners under the Senate framework. The speculative pieces here — the size of the 2025 grant and its timing — are informed expectations, not announced fact. But the direction of travel is clear: exempted gallons are no longer anyone’s free lunch, and the fight over who pays for them has moved to the center of farm bill politics.

AG POLICY & MARKETS DAILY   |   POLICY ANALYSIS  |  E15 & THE RFS — TUESDAY, AUGUST 04, 2026