Pumped storage plant "Koepchenwerk" (new building) at the Hengsteysee (Ruhr), Herdecke, North Rhine-Westphalia, Germany.
User <a href="//commons.wikimedia.org/wiki/User:PodrPro" title="User:PodrPro">PodrPro</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>