Abstract: A method for the methanation of biomass and the energetic use of the biogas obtained in a plant featuring at least one fermenter operating in a batch process, the fermenter is filled with biomass, a loading opening is closed in an airtight manner, methane-rich biogas produced in a fermentation phase is fed into a first gas storage unit, at least intermittently, during the flushing of the fermenter with flushing air, mixed gas with low methane content is fed into a second gas storage unit, at least intermittently, the loading opening is opened and the fermentation residue is removed from the fermenter. The energetic use of gas stored in the second gas storage unit is carried out such that gas removed from this gas storage unit is mixed with the biogas removed from the first gas storage unit before the mixed gas produced in this way is subsequently used energetically.