Revised 3 October 2026 · v1.0.0

America's Renewable Fuel Standard (RFS) works through tradeable credits. Each gallon of qualifying biofuel generates a RIN (Renewable Identification Number), and refiners must retire enough RINs to meet a yearly quota. Small refineries can ask to be exempted if compliance causes them "disproportionate economic hardship". The value of a RIN therefore depends on two numbers that EPA controls: how many gallons it mandates, and how many gallons it lets small refineries walk away from. Over the past three years the courts have reshaped both. We read the full text of every major ruling, pulled from the open CourtListener archive run by the non-profit Free Law Project. The pattern is clear: refiners have won almost every fight over exemptions, biofuel producers have won almost every fight over volumes, and the outcome now turns on EPA's discretion to reallocate.

The scorecard

1. The exemption fight: EPA's blanket "no" did not survive

In 2022 EPA denied all 105 pending small-refinery petitions (compliance years 2016–2021) on two nationwide theories:

• hardship counts only if RFS compliance is its sole cause;
• refiners never really bear RIN costs, because they pass them through in the price of fuel.

Both theories have now failed. In Sinclair Wyoming Refining v. EPA (No. 22-1073, Aug. 2024) the D.C. Circuit held that EPA had read "other economic factors" out of the statute: "the statute nowhere suggests that this must be the sole cause of the hardship." It called the pass-through finding arbitrary because EPA ignored three things:

• its own 2019 view that real-time RIN retirement is infeasible;
• weekend fuel sales, about 28% of transactions, when no RIN price is quoted;
• evidence that pass-through is not immediate.

The court added that EPA "cannot sunset the small refinery exemption by regulatory fiat." The Fifth Circuit reached a similar result in November 2023.

The Supreme Court then settled where these fights belong. In EPA v. Calumet (7–2, June 2025) it held that each denial is a local action. Because EPA's denials rested on nationwide determinations, chiefly the pass-through theory, review lies only in the D.C. Circuit. That wiped out the Fifth Circuit's ruling as precedent and left the D.C. Circuit's Sinclair decision as the controlling merits ruling. Refiners lose the ability to pick a friendlier court, but the merits ruling they would have gone there for already stands.

In April 2026, Alon Refining Krotz Springs v. EPA widened eligibility. EPA had refused 2024 exemptions to two refineries whose 2023 throughput topped 75,000 barrels a day. The court read EPA's own 2014 rule as looking at a single year. For a 2025 petition about 2024, that year is 2024. Judge Rao went further and said the Clean Air Act itself defines a small refinery by one year of throughput.

2. The volume fight: biofuels keep winning

On volumes, EPA and the biofuel industry have a near-perfect record:

• Sinclair Wyoming v. EPA (No. 22-1210, May 2024) upheld the 2020–22 mandates and a 250-million-gallon make-up volume. It also upheld EPA's switch to subtracting exemptions it projects it will grant when setting each refiner's percentage. That shifts the obligation onto non-exempt refiners in advance.
• Center for Biological Diversity v. EPA (June 2025) upheld the 2023–25 volumes against refiners, biodiesel groups and Neste. It held that the statute does not require a cost-benefit analysis and called rising RIN prices "a completely understandable effect" of the programme.

The environmental groups did win two points in that case. EPA's climate analysis was arbitrary because it used 2010 lifecycle numbers for crop-based fuels, corn ethanol above all, without explaining why it set aside its own newer literature review. The Fish and Wildlife Service's "no effect" finding ignored EPA's own land-conversion models. The remedy was a remand without vacatur, so the volumes stand.

3. Reallocation: the open question

Biofuel groups argued for years that EPA must add exempted gallons back onto other refiners. In Clean Fuels Alliance America v. EPA (March 2026) the D.C. Circuit dismissed that challenge as moot. It added that since 2022, "EPA's duty now is to 'ensure' achievement of targets EPA itself has broad discretion to determine." That is double-edged: reallocation is not mandatory, but EPA is free to do it.

EPA did exactly that. Its final 2026–27 "Set 2" rule (March 2026) sets record volumes of 25.82 billion RINs for 2026 and 25.98 billion for 2027. It also reallocates 70% of the gallons exempted for 2023–25: roughly 0.99 billion RINs in 2026 and 1.04 billion in 2027. The refiners' trade group AFPM and environmental groups petitioned the D.C. Circuit in June 2026, and compliance applies unless a court orders otherwise. Expect the arguments from the earlier cases to return: cost-benefit (Katsas), the age of the lifecycle data and the ESA consultation (CBD), and discretion (Clean Fuels).

4. Credit integrity: the criminal edge

United States v. Dermen (10th Cir., July 2025) affirmed a 40-year sentence in the Washakie Renewable Energy scheme. Finished biodiesel was relabelled as feedstock, moved through related companies on false invoices, and "processed" only on paper. It then generated RINs and the per-gallon blending tax credit, often several times over on the same fuel.

• Washakie filed more than $1 billion in false claims and collected more than $500 million.
• The court ordered $442.6 million in restitution and a $181.8 million money judgment.
• Forfeiture reached assets in Turkey and Luxembourg.

The court's own words explain why this matters to anyone holding credits: "RINs carry independent economic value from the renewable fuel from which they are generated." The red flags for credit buyers are circular counterparty flows, below-market resales to related parties, and processing that leaves no physical trace.

5. The European mirror

The EU runs a parallel system of mandates and sustainability certification, and its courts are drawing similar lines.

• BP France (C-624/22, July 2024). The Court of Justice held that the Renewable Energy Directive's mass-balance and voluntary schemes certify sustainability; they do not fix how much of a co-processed fuel counts as renewable. France could not require a carbon-14 lab test on co-processed renewable diesel (HVO) imported from another member state when its own plants were spared it. That would breach free movement of goods (Article 34 TFEU).
• ePURE and Pannonia Bio (T-1165/23 and T-45/24, February 2025). The European ethanol industry's challenges to FuelEU Maritime's treatment of crop-based fuels and to ReFuelEU Aviation's SAF mandate were dismissed as inadmissible.

• BP France: write proof-of-content rules that treat domestic and imported fuel alike.
• Dermen: build physical verification into credit issuance.
• Sinclair: when a regulator grants or denies hardship relief, make the decision individual and well-reasoned.

What to watch

• The D.C. Circuit's ruling on the 2026–27 Set 2 petitions, especially on the 70% reallocation.
• EPA's remand decisions on the 2016–2024 exemption petitions after Sinclair and Alon, and how many RINs come back to the market.
• EPA's redo of the corn-ethanol lifecycle analysis ordered in CBD.
• 45Z clean-fuel tax credit: IRS Notice 2026-53 (September 2026) published the 2026 emissions-rate table, at a credit of up to $1.00 per gallon.

Sources: full opinions retrieved from CourtListener (Free Law Project): EPA v. Calumet Shreveport Refining, 605 U.S. 627 (2025), No. 23-1229; Sinclair Wyoming Refining Co. v. EPA, D.C. Cir. Nos. 22-1073 (amended op. 14 Aug 2024) and 22-1210 (14 May 2024); Calumet Shreveport Refining v. EPA, 5th Cir. No. 22-60266 et al. (22 Nov 2023); Alon Refining Krotz Springs v. EPA, D.C. Cir. No. 25-1187 (7 Apr 2026); Clean Fuels Alliance America v. EPA, D.C. Cir. No. 20-1107 (13 Mar 2026); Center for Biological Diversity v. EPA, D.C. Cir. No. 23-1177 (20 Jun 2025); United States v. Dermen, 10th Cir. No. 23-4074 (9 Jul 2025). EU: CJEU C-624/22 BP France (29 Jul 2024); General Court T-1165/23 and T-45/24 (25 Feb 2025), via EUR-Lex. Volumes: EPA, Final Renewable Fuel Standards for 2026 and 2027; DTN, 27 Mar 2026. 45Z: IRS Notice 2026-53. Quotations are from slip opinions. This is a summary of public court records, not legal advice.

About this article: Researched, written and edited by Umashankar Triplicane Dwarakanathan, with AI research assistance; every figure is meant to trace to the primary source cited. See the Editorial Policy for how sourcing, AI use and corrections work.