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As implausible as it may sound, barrels of whiskey may soon be crossing paths with barrels of petroleum.

Brewers are beginning to tap into brewing byproducts in order to harness their energy potential. Earlier this year, New Zealand-based DB Export launched Brewtroleum, a biofuel made from a beer yeast, and Scotland-based Celtic Renewables developed a whiskey-based biofuel. Both fuels use byproducts created during the fermentation process.

The whiskey-based biofuel combines two residues — pot ale and draff — to create a new raw material that is converted into biobutanol. Brewtroleum is a combination of 90% petroleum and 10% ethanol, which is derived from yeast slurry. DB Export isn’t the first brewing company to develop an ethanol-blended fuel — U.S. brewer Molson Coors introduced fuel-grade ethanol in 1996.