L Hibbert, Going organic, Professional Engineering, 7 November 2007, p 26

In Germany, Choren is one of the leading firms in the development of so-called second generation biodiesel, based on the biomass-to-liquid technology, sourced from wood chips, straw, fast-growing willow or miscanthus grass, waste wood, old railway sleepers, and treated household waste, resulting in ultra-clean high-cetane diesel free of aromatics and sulphur. Choren's Freiberg facility will start producing 18 million L annually of SunDiesel by next year, with a 250 million L capacity plant envisaged as the next step. Whereas one hectare of first generation biomass will produce 1300 L of biofuel, this output would be raised to 4300 L by the biomass-to-liquid approach using the whole of the vegetable plant, which does not compete with food crops.