NOVELTY - The transportable modularly-designed biogas plant comprises a contiguous fermenter chamber (20), which is formed by two transportable fermenter modules (10) connectable and/or connected with one another at its front sides with a flat base area. The fermenter modules have a rectangular cross-section, are connectable and/or connected with one another by connecting flanges (45), and have dimensions that are maximum 15 in length, 3.5 m in breadth and 3.5 in height, where the dimensions of the modules are equally large. Each of the modules comprises a horizontally moving agitator shaft (54).    USE - Transportable modularly-designed biogas plant useful for anaerobic fermentation of biomass and/or organic waste, and in public buildings, schools, tourist facilities, sports and recreational facilities, hotels and hospitals for generating electricity.    ADVANTAGE - The transportable modularly-designed biogas plant can be technically, simply and cost-effectively manufactured with less energy and less material requirements, is space-saving and compact, reduces the effort and cost of transport over public network, rail network and/or ships, and allows reuse of the biogases in an easier manner.    DETAILED DESCRIPTION - The transportable modularly-designed biogas plant comprises a contiguous fermenter chamber (20), which is formed by two transportable fermenter modules (10) connectable and/or connected with one another at its front sides with a flat base area. The fermenter modules have a rectangular cross-section, are connectable and/or connected with one another by connecting flanges (45), and have dimensions that are maximum 15 in length, 3.5 m in breadth and 3.5 in height, where the dimensions of the fermenter modules are equally large and identical. Each of the fermenter modules comprises a horizontally moving agitator shaft (54), where the agitator shafts of the modules are connectable and/or connected with one another in a rotationally fixed manner and are driven by a single common drive (53). Envelopes of the fermenter modules are self-supported and consist of steel. The self-supported envelopes are stable, so that the fermenter modules are transportable in a connection state. The outer sides of the fermenter chamber comprise insulating plates having mineral wool for reducing heat losses and for weather protection. The fermenter modules have a common upwardly pointed opening in the connection state, where a gas storage film such as double membrane air-tight impermeable cover is arranged over the opening for the formation of common gas storage. A microorganism carrier is arranged between the fermenter chamber and the gas storage for biological desulfurization. The longitudinal sides of the fermenter modules contact with longitudinal sides of two further fermenter modules, which form a further contiguous fermenter chamber. Fermenter heating elements such heating tubes are arranged with U-profile between the fermenter chambers and/or at one longitudinal side of the fermenter module for heating or cooling the fermenter chambers. An INDEPENDENT CLAIM is included for a fermenter module for the formation of a fermenter chamber of a biogas plant.    DESCRIPTION OF DRAWING(S) - The diagram shows a side view of a biogas plant.    Fermenter modules (10)    Fermenter chamber (20)    Connecting flanges (45)    Drive (53)    Agitator shaft. (54)