Biogas storage systems actively promote the generation of renewable energies thus largely contributing to environmental protection. High-end future and safety-oriented storage concepts for biogas, substrate and fermenters have a long tradition at SATTLER CENO. In 1981, SATTLER invented the double membrane gas holder for gas storage and the process of anaerobic digestion at sewage treatment plants. This concept has proven effectiveness for many decades, is consistently developed and is a fixed component of modern sewage treatment plant concepts, as well as of agricultural and industrial biogas equipment.