Green Biofuels Ltd went into administration in the UK on Monday. Certa claims that more than 12m litres of biofuel it paid for is 'missing or does not exist' Green D Project Ireland Ltd entered into an agreement to buy some 18m liters of hydrotreated vegetable oil (HVO) biofuel. It is made from waste vegetable oils and animal fats and is marketed as a low-emission substitute for diesel.