NOVELTY - Biogas generating plant comprises tunnel fermentation chamber, gas-tight gable walls and biogas store formed by double layer of roof covering foil with inlet to biogas store situated in upper part of fermentation chamber, where two layers of foil, upper foil (3a) and lower foil (3b), forming the biogas store (3c), are secured on opposite sides of the rigid arch roof covering load-bearing construction, the lower foil (3b) has gas slots (29), and a duct fan (8) forcing circulation of biogas to biogas store is connected into the inlet channel.    USE - As plant for generating biogas (claimed).    ADVANTAGE - The biogas plant construction, after the removal of the gable walls, enables moving the self-supporting roof construction in order to enable unhindered loading of biomass and removal of post-fermentation products. After completing the process of methane fermentation the whole roof construction may be moved to the side desired along guide rails enabling easy access to the biomass container. Application of biogas store construction ensures a circulation of biogas through the gas slots and progressive expulsion of air at the beginning of the process and then the mixture of gases with lower methane value, which enables obtaining biogas with a high fuel value. Application of internal channel to the pulp executed with a perforated barrier enables increasing moisturization of lower layer of biomass and intensification of the methane fermentation process, with the use of pulp containing biomass and other organic wastes, especially occurring with livestock production. The construction of the biogas unit enables easy adaptation to fulfill various functions. The installations for the production and utilization of biogas enables the running of a continuous process of methane fermentation in the fermentation chamber with the use of dry and pulp biomass, with the possibility of regulating the process intensity. The use of the biogas store with gas slots at the level of one quarter of the height of the store and the extraction of carbon dioxide near the roof construction base enables obtaining biogas with enhanced methane value due to the possibility of displacing heavier gas components from the biogas store with return to the fermentation chamber, and gases of a greater density-principally carbon dioxide to the exterior of the store.    DETAILED DESCRIPTION - Biogas generating plant comprises tunnel fermentation chamber, equipped with biomass container with thermally insulated base and essentially vertical foundation walls, installations for moisturizing biomass with a process liquid, installations for recirculation of seepage water, arch roof covering spread over arch load-bearing construction and supported on essentially vertical biomass container walls, gas-tight gable walls and biogas store formed by double layer of roof covering foil with inlet to biogas store situated in upper part of fermentation chamber, where two layers of foil, upper foil (3a) and lower foil (3b), forming the biogas store (3c), are secured on opposite sides of the rigid arch roof covering load-bearing construction, the lower foil (3b) has gas slots (29) at one quarter of the height of the arch load-bearing construction, and a duct fan (8) forcing circulation of biogas to biogas store is connected into the inlet channel, where lower edges (5) of roof covering are supported on upper part of essentially vertical foundation walls (1) of the biomass container, while the installations for moisturizing biomass with process liquid have moisturizing nozzles (7a), placed in the biomass loading zone and variable heights, depending on the height of the biomass loading zone, preferably in intermediate zone (1b), and in the biomass loading zone there is a channel (2) for pulp, preferably created by a perforated barrier (4) supported on the base of biomass container or constituting a perforated pipe, suspended, supported or resting freely in a biomass layer. An INDEPENDENT CLAIM is included for installation to produce and utilize biogas comprising a tunnel fermentation chamber, constituting a space inside a biogas generator with a convex roof covering spread over an arch load-bearing structure, a gas store formed by two layers of roof covering foil with an inlet to the gas store situated in the upper part of the fermentation chamber, installations for moisturizing biomass with a process liquid, installations for recirculation of seepage water, a cogeneration system powered by biogas supplied through a gas pipeline from the biogas store and an automated system for controlling the process of production and utilization of biogas, where two layers of foil, upper and lower, forming the biogas store, are secured on opposite sides of the rigid arch roof covering load-bearing construction, the lower foil has gas slots, and a duct fan forcing circulation of biogas to biogas store is connected into the inlet channel, where lower edges of roof covering are supported on upper part of essentially vertical foundation walls of the biomass container, while the installations for moisturizing biomass with process liquid have moisturizing nozzles, placed in the biomass loading zone and variable heights, depending on the height of the biomass loading zone, preferably in intermediate zone, and in the biomass loading zone there is a channel for pulp, preferably created by a perforated barrier supported on the base of biomass container or constituting a perforated pipe, suspended, supported or resting freely in a biomass layer, supplied with pulp through an internal pipeline situated in the channel for pulp, where the installations for recirculation of seepage water include a non-membrane heat and mass exchanger connected through a seepage water pipeline with the biomass container and a return pipeline with installations for moisturizing biomass with a process liquid, and where the non-diaphragm heat and mass exchanger has a permanent mass of a high heat capacity, through which seepage water is passed in the opposite direction to exhaust gases supplied to the permanent mass by an exhaust conduit from the cogeneration system.    DESCRIPTION OF DRAWING(S) - The figure shows transverse cross-section view of the biogas generating plant with tunnel fermentation chamber and internal installations to produce and store biogas.    Foundation walls (1)    Upper foil (3a)    Lower foil (3b)    Biogas store (3c)    Gas slots (29)