Celtic Renewables is a UK industrial biotechnology company producing bio-based solvents and fuels via acetone–butanol–ethanol (ABE) fermentation. Founded in 2012 as a spin-out from Edinburgh Napier University, it employs clostridial microorganisms to convert low-value by-products and waste into chemicals.
The company operates a biorefinery in Grangemouth, Scotland, and manufactures bio-acetone, bio-butanol, and bio-ethanol for applications in solvents, coatings, adhesives, personal care, and fuel blending. Feedstocks include residues from the food and drink sector (such as whisky by-products) and agricultural materials, offering drop-in alternatives to fossil-derived equivalents and supporting resource efficiency. Celtic Renewables plans to expand production through additional biorefineries and collaborations across supply chains.