The article offers information on Wyhlen hydropower plant of the Energiedienst Group, part of the Augst-Wyhlen twin power plant, which was built between 1908 and 1912 in Grenzach-Wyhlen, Germany. Topics discussed include use of Kaplan turbines as doping turbines at the Wyhlen hydropower plant; importance of hydropower in the context of the energy transition; and focusing on modernization and expansion of hydropower plant.