NOVELTY - Biogas plant for producing biogas from organic waste, comprises at least one reactor unit with a reactor container for holding the waste to be treated, a functional unit for adding percolate, a ventilation device for controlling the amount of air in the reactor container, a heating device for heating waste present in the reactor container, a sensor device for detecting at least one process parameter running in the reactor container, a gas reservoir for intermediate storage of the produced gas, and a control unit for controlling and/or monitoring the functional unit of the reactor unit.    USE - The biogas plant is useful for producing biogas from organic waste.    ADVANTAGE - The biogas plant comprises: many reactor units, which can be quickly transported and are easy to handle; and gas reservoir comprising the chamber of variable volume for introducing gas without pressure buildup and without sophisticated valve technology.    DETAILED DESCRIPTION - Biogas plant for producing biogas from organic waste, comprises at least one reactor unit with a reactor container for holding the waste to be treated, a functional unit, preferably a percolation device for adding percolate, a ventilation device for controlling the amount of air in the reactor container, a heating device for heating waste present in the reactor container, a sensor device for detecting at least one process parameter running in the reactor container, a gas reservoir for intermediate storage of the produced gas, and a control unit for controlling and/or monitoring the functional unit of the reactor unit. The reactor unit is designed as a mobile vehicle container unit, which is provided with a detachable coupling means comprising a gas connection coupling for coupling to the gas reservoir and a signal line- and/or energy connection coupling for coupling to the control unit. INDEPENDENT CLAIMS are also included for:    (1) operating the biogas plant for producing biogas from organic waste with many reactor units and the control unit for controlling the reactor units, comprising varying the number of reactor units as a function of the capacity requirement and/or the resulting waste, where at least one additional mobile reactor unit is supplied connected with the control unit at increasing capacity requirement and/or increasing amount of waste and/or at least one reactor unit is separated and removed from the control unit with decreasing capacity requirements and/or decreasing amount of waste; and    (2) the reactor unit of the biogas plant for producing biogas from organic waste, comprising the reactor container for holding the waste to be treated and the functional unit for treating and/or monitoring waste received in the reactor container and its process parameter.