TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The discharge conveying device is arranged along the unloading edge for receiving the biomass slipped out from the storage container. The unloading edge of the storage container and the filling port of the fermentation tank is arranged in such a manner that the biomass is added above a filling level of the fermenting mass in the fermentation tank of the unloading edge of the storage container by the discharge conveying device, and is introduced into the filling port of the fermentation tank below the filling level. The storage container exhibits: at least one loading edge with a height lower than the unloading edge, where the loading edge over-lifts loading equipments of a delivery vehicle including a loading bucket of a wheeled loader; and a lockable filling port with the loading edge in at least one side wall. The plant comprises a belt (21) as the insert, where an end of the belt is fixed at the unloading edge, and the pulling device acts on the other end of the belt. The storage container exhibits a front wall (12) with the unloading edge and oppositely a super-elevated rear wall (13), where the pulling device acts on the insert via the upper edge of the rear wall. The pulling device exhibits: at least one winding device for reducing the insert; and a deflecting equipment for the insert, preferably deflecting roller. The deflecting equipment is arranged in the area of an upper edge on at least one wall of the storage container, preferably rear wall, and the pulling device acts on the insert via the deflecting equipment in such a manner that the insert is pulled down for reducing on an outer side of the wall. The storage container exhibits super-elevated side walls, between which the insert is inserted, and the walls are connected via the front wall with a small height, so that a discharge opening is limited itself from the unloading edge above the front wall. The storage container exhibits a height-adjustable rear wall against the front wall, where the pulling device acts on the insert via the upper edge of the rear wall. The rear wall between an upper end position corresponding to the upper edges of the super-elevated side walls, and the lower end position corresponding to the loading edge, are height-adjustable. The insert is pulled around and held on the upper edge of the rear wall up to the rear side by the pulling device, preferably deflecting roller, and the reduction of the insert in the storage container is affected by raising the adjustable rear wall. The plant comprises: an equipment for generating a vacuum between the base of the storage container and the lower side of the insert; a first measuring equipment for the actual value of the biomass withdrawn via the unloading edge of the storage container; a control, which activates the pulling device gradually for reducing the insert upon detection of a deviation of the actual value from a reference value of the biomass withdrawn via the unloading edge of the storage container; a second measuring equipment, preferably length measuring devices for the actual value of the reduction of the insert by the pulling device; a control, which activates the pulling device for reducing the insert until a starting value for the gradual activation of the pulling device is detected for reducing the synchronized reduction of the insert by the second measuring equipment; a third measuring equipment, preferably weight measuring equipments for the actual value of the biomass present in the storage container; and a control, which activates the pulling device for extending the insert into the storage container, in case an alteration of the actual value of the withdrawn biomass is not detected at the end of a predetermined quantity of the gradual reduction of the insert by the third measuring equipment. The equipment for generating the vacuum is arranged on the lower edge of the wall of the storage container in such a manner that the flexible insert is applied completely from an inner side of the wall of the storage container up to the base of the storage container in the lowered position. The first measuring equipment comprises a filling level monitoring to determine the actual value of the biomass withdrawn from the filling level of the discharge conveying device.