Biogas plant comprises a fermenter tank (1), an aggregate carrier (2), which is mounted in a vertically aligned manner in the fermenter tank, and a aggregate (10), preferably a submersible motorized stirring device, which is mounted height adjustably at the aggregate carrier using a height adjustment device (11). The height adjustment device is formed by a belt drive. A traction means of the belt drive is led by at least two deflecting elements (15, 38), which is spaced in aggregate carrier-longitudinal direction. At least one deflecting elements is rotatably driven using a drive means. Biogas plant comprises a fermenter tank (1), an aggregate carrier (2), which is mounted in a vertically aligned manner in the fermenter tank, and a aggregate (10), preferably a submersible motorized stirring device, which is mounted height adjustably at the aggregate carrier using a height adjustment device (11). The height adjustment device is formed by a belt drive. A traction means of the belt drive is led by at least two d
