REHART replaces faulty hydropower screws. With much excitement, the largest hydropower plant built by REHART, the Hausen hydropower plant, went into operation in summer 2011. The plan was that two screws with a diameter of 3.4 meters each and a total output of 500 kW use the power of the water in the Black Forest to generate environmentally friendly energy.The plant has done exactly that over the past 8 years. However, after some 5 years of operation, it turned out that the weld seams on the screw coils in the outlet could not hold up to the large loads. Cracks formed and the coils were damaged by the massive forces acting there. Following extensive tests and expert reports, it was possible to prove that this had been caused by errors in the design of the screws and poor workmanship in the welding work. “Back then we made a mistake - partly due to the lack of experience," admits Klaus Schülein, Managing Partner of REHART GmbH. "However," Schülein continues, "we admit our faults and therefore replaced both screws after almost 9 years of operation at no expense for our customers. Over the years we have since learned a lot and know that the new screws no longer have this defect and that the system will continue to work profitably for our customers after the replacement!” The calculation of the new screws was checked by external experts. In addition, REHART GmbH is now certified according to DIN ISO 9001:2015, is a certified welding specialist in accordance with the requirements of DIN EN 1090-1/-2, and the employees entrusted with the welding work have the best qualifications.Under the REHARTPOWER brand, REHART has built more than 125 hydropower plants and continuously improved and optimized both the design and the production processes. In conjunction with FAS (fish migration screw system REHART/Strasser) the plants guarantee the officially required passability of flowing waters in both directions and make a valuable contribution to environmentally friendly energy generation.