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In Europe, currently more than 21 000 hydropower plants exist. The majority (ca. 90 %) are hydropower plants smaller than 10 MW installed capacity (WWF, 2019). Large hydropower plants (more than 10 MW) represent only 10 % of all hydropower facilities but they generate almost 90 % of the total hydropower energy production (Devoldere et al., 2011). Germany has the highest number of hydropower plants (more than 7 700), while Austria, France, Italy, and Sweden all have more than 2 000 hydropower plants (Kampa et al., 2011). Also, in Norway and Spain, there are more than 1 000 existing hydropower plants (WWF, 2019).