The next time you order a burger and fries, you just might help a refinery reduce emissions. At least four refiners this year have stepped forward with plans to convert their existing facilities from diesel produced from crude, to renewable diesel produced from cooking oil.

Phillips 66, Marathon, CVR Energy, and HollyFrontier have ramped up their projects amid the slowdown in gasoline demand. Phillips 66 in August announced plans to repurpose its refinery in Rodeo, Calif., to produce 100% renewable fuels from oils, fats, and greases. Retooling is expected to take 18-20 months. Once operational, Rodeo Renewed will produce more than 800 million gallons a year, making it the largest plant of its kind in the world. Acquiring enough greasy supplies for use as feedstock, however, could pose its own challenges. Curiously, the U.S. doesn’t produce enough. Getting ahead of the demand, Valero has inked a deal for fats and used cooking oil with Darling Ingredients, which collects and converts animal-based products across the globe. So, the next time you hear “Fries with that?” yep, you know what to say.

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