NOVELTY - Generation of biofuel involves operatively connecting a biofuel producing anaerobic digester with a hydroponic biomass crop producing system in a biofuel producing unit, where the hydroponic biomass crop producing system configured to continually provide biomass fuel stock crop to the anaerobic digestor, and the anaerobic digestor is configured to anaerobically digest the biomass crop (32) and provide nutrients and carbon dioxide generated during the digestion to an additional biomass crop growing in the hydroponic system (20), and to produce biofuel gas.    USE - For the generation of biofuel (claimed) such as methane and carbon dioxide rich biogas.    ADVANTAGE - The method is an efficient and economical method for generating biofuel and a biofuel generating system with high yield; and has minimal operating cost, with the use of an anaerobic digestor which has an integrated biomass feed stock source.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a device for generating biofuel gas, comprising at least one unit comprised of at least one hydroponic system, and at least one anaerobic digester (10); where the at least one hydroponic system and the at least one anaerobic digester are interconnected with respective conduits (15) through which biomass crops grown in the at least one hydroponic system are fed as feedstock to the at least one anaerobic digester, and carbon dioxide gas and nutrient containing digestate, generated by the at least one anaerobic digestor, are provided through other respective conduits to the at least one hydroponic system, and the at least one anaerobic digestor has an external outlet (13) for the collection of biofuel gas generated by the at least one anaerobic digester.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the integrated anaerobic digester and hydroponic system.    One anaerobic digester (10)    Outlet (13)    Conduits (15)    Input (16)    One hydroponic system (20)    Biomass crop (32)