EDINBURGH-based Celtic Renewables, which produces biofuel from residues of the whisky industry, has won £500,000 further investment.

The company received £250,000 from the Scottish Investment Bank, the investment arm of Scottish enterprise. An existing private investor provided £250,000. Celtic Renewables recently unveiled the first samples of bio-butanol from the by-products of whisky fermentation using a process developed by its scientists. The company hopes to build its first demonstration facility at the Grangemouth petrochemical plant by 2018.