HF Sinclair sues EPA over delayed biofuel waiver decisions
HF Sinclair sued EPA over delayed small-refinery waiver decisions as the agency kept working through a backlog that has swung 14 of 16 recent rulings.
HF Sinclair on July 24 sued the U.S. Environmental Protection Agency over delayed small-refinery waiver decisions, after EPA approved 14 of 16 waivers in a November 2025 batch.
The Renewable Fuel Standard forces refiners to blend biofuels unless they qualify for a small refinery exemption, and timing on those rulings shifts RIN buying, blending plans and compliance costs. EPA Administrator Lee Zeldin said on May 15, 2025 that the agency would rule on a backlog of small refinery exemption requests, but the exemption docket kept producing new disputes.
EPA denied 26 petitions from 15 small refineries on July 14, 2023, covering the 2016-2018 and 2021-2023 compliance years. The legal fight predates that decision. EPA moved on May 3, 2021 to vacate three waivers previously granted to Sinclair Oil, and a U.S. appeals court on July 26, 2024 vacated EPA denials of 2022 small refinery biofuel waivers. In a separate 2024 ruling, the court said EPA had wrongly denied a waiver to Ergon’s West Virginia refinery.
The appellate pressure kept building into 2026. A D.C. Circuit opinion dated April 7, 2026 in Alon Refining Krotz Springs, Inc. v. EPA showed the exemption issue was still being fought in court, even as refiners pressed EPA to close out pending petitions. For HF Sinclair, the dispute is not just about one company’s obligations. It is about whether EPA can leave waiver requests unresolved long enough to distort compliance planning across the refining sector.
Biofuel producers have a direct stake in the timing because every waiver granted to a refiner can reduce blending demand. The November 7, 2025 EPA decisions showed how quickly the balance can move, with 14 approvals out of 16 actions announced that day. Bloomberg said HF Sinclair and Phillips 66 won exemptions in that batch, and one market summary put HF Sinclair’s exemption at a $115 million boost.
That mix of denials, approvals and court reversals has made the exemption process one of the most volatile parts of RFS administration. With waiver outcomes still moving through the courts, refiners face compliance risk on one side and investors in ethanol and other biofuels face demand risk on the other.
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