Diamond Alternative Energy, LLC v. Environmental Protection Agency

On June 20, 2025, the United States Court of Appeals for the District of Columbia Circuit issued its decision in Diamond Alternative Energy, LLC v. Environmental Protection Agency. Diamond Alternative Energy, a small petroleum refinery, petitioned for review of EPA's denial of a hardship exemption from Renewable Fuel Standard compliance obligations. The company argued that meeting the blending requirements imposed a disproportionate economic burden and that EPA had misinterpreted the statutory criteria for granting relief. The EPA maintained that its denial was based on a thorough analysis of the refinery's financial condition and the agency's established methodology, which showed the costs were not severe enough to warrant an exemption. The court examined the administrative record, assessing whether the agency's action was arbitrary and capricious, and considered competing arguments about the scope of Clean Air Act waiver provisions and the deference owed to agency technical determinations.

The D.C. Circuit denied the petition for review, upholding the EPA's denial of the exemption. The court held that the agency reasonably explained its decision and that its economic assessment was consistent with the statutory text and prior case law, warranting deference under the arbitrary and capricious standard.

Whether the Environmental Protection Agency acted arbitrarily and capriciously in denying Diamond Alternative Energy's petition for a small refinery hardship exemption under the Renewable Fuel Standard, specifically regarding the interpretation of "disproportionate economic hardship" and the evidentiary standard required to prove it.

The decision reinforced the EPA's stringent approach to granting Renewable Fuel Standard waivers, limiting the availability of economic hardship exemptions for small refineries. It signaled to the refining industry that compliance costs would be narrowly scrutinized, potentially raising operational expenses for smaller players while bolstering the market stability and investment outlook for renewable fuel producers such as ethanol and biodiesel plants.