Dairy Waste Jet Fuels

Circularity Fuels completed the world's first end-to-end conversion of raw agricultural biogas into sustainable aviation fuel, drawing methane directly from a California dairy farm's manure digester and producing finished jet fuel that meets commercial aviation specifications. The six-month pilot ran continuously on raw biogas with roughly 65% methane and 35% CO₂, using a two-reactor modular system small enough to operate on-site at the farm.

Internal life-cycle modeling placed the fuel's carbon intensity at -350.7gCO₂e/MJ, making it net carbon-negative by capturing methane the dairy would otherwise vent to the atmosphere. The resulting fuel can be blended up to 50% with conventional jet fuel and qualifies for federal and state biofuel incentive programs.

Circularity Fuels shows how distributed agricultural waste streams could become a cost-competitive, climate-positive feedstock for decarbonizing commercial aviation.

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