The wet fermentation technology widely used up to this point, which was designed essentially for fermentation of liquid manure, reaches the limits imposed by the process at DS (dry substance) contents greater than 15%. The reason for this is essentially that the substrate is increasingly difficult to agitate and pump. In addition the wear out of aggregates increases with higher dry substances. By contrast, there is no upper limit for DS content in dry fermentation based on our process. The substrate and fermentation residue are brought in and removed in solid, stackable form. Our plants consist of two main plant sections in which organic substances are simultaneously converted into biogas, dry fermenters and a process water tank. There is in addition a delivery area and a part of the plant designed for use of the biogas that is produced (for example a combined heat and power unit (CHP) or gas supply) as well as further plant sections.