NOVELTY - Energy supplying unit based on biogas for supplying energy to several consumers in an association with supplying networks for electricity and natural gas, comprises: a fermenter module with at least two fermenters, where a first fermenter (F1) is provided for fermenting a substrate, and producing a first biogas stream (B1); a first purifying device downstream the first fermenter; a first drying device downstream the purifying device; a block-type thermal power station for generating electricity from biogas; and a second fermenter (F2) for generating a second, oxygen-free biogas stream.    USE - Used as an energy supplying unit.    ADVANTAGE - The energy supplying unit: allows energy supply throughout a year with a total efficiency of the generated energy of 92.7%; exhibits low generation- and operating costs since it does not require a separate, costly biogas storage for different conditions.    DETAILED DESCRIPTION - Energy supplying unit based on biogas for supplying energy to several consumers (small consumers) in an association with supplying networks for electricity and natural gas, comprises: (i) a fermenter module with at least two fermenters, where a first fermenter (F1) is provided for fermenting a fermentation substrate (biomass, manure and/or sewage sludge), and producing a first biogas stream (B1) with a high content of carbon dioxide, hydrogen sulfide and ammonia and comparatively a low content of methane and hydrogen; (ii) a first purifying device downstream the first fermenter for removing sulfur compounds and ammonia, and separating carbon dioxide from the first biogas stream under normal pressure and temperature; (iii) a first drying device downstream the first purifying device for adjusting a relative humidity of the purified first biogas stream to below 50%; (iv) a block-type thermal power station for generating electricity from biogas, where the block-type thermal power station is connected with the first drying device via a first pipeline, and the heat energy accumulated in the block-type thermal power station during the electricity generation is removed via a hot water pipeline (L13), which is connected to at least one consumer inside the energy supplying unit; (v) a second fermenter (F2) for generating a second, oxygen-free biogas stream with a methane content of at least 60%, where the second fermenter is connected with a second purifying device via a pipeline for purifying the second biogas stream under normal pressure and temperature, and a subsequent device for drying the purified biogas stream to natural gas quality, where the gas pipeline emerging from the second purifying device is integrated into the local natural gas network; (vi) a safety system, which is designed in such a manner that the required operating pressure is made only via the gas pressure persisting in the fermenters, where a gas-side pressure loss of a maximum of up to 25 mbar is respectively observed in the individual modules according to the fermenters during the operating condition; and (vii) a central controlling- and regulating unit. The two fermenters are connected temporarily with each other via transporting pipelines for promoting the fermentation substrate from the first fermenter into the second fermenter after a defined fermentation time period, and/or recycling the fermenting liquid into the first fermenter.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the energy supplying unit (drawing includes non-English language text).    First biogas stream (B1)    Third biogas stream (B3)    First fermenter (F1)    Second fermenter (F2)    Hot water pipeline (L13)