Device for producing and using biogas

Device for producing and using biogas with a building (1), which has several spaces (6, 10, 12, 15, 16, 17), wherein a first space (6) forms the shell of a biogas reactor (BG) and a second space (10) surrounding an accumulator biogas (BS), and wherein the building (1) has at least a third space (12) in which is housed a device (14) for converting biogas into electrical energy, characterized in that the biogas reactor (BG) is mounted a stirring mechanism capstan (8, 8a) for stirring and grinding of solid biomass.