Stock Photo - 07 May 2019, Rhineland-Palatinate, St. Goar: A working boat drills the holes for the mooring chains of 16 current buoys in a tributary of the Rhine. The eleven-metre-long mini hydroelectric power stations of the company Strom-Boje Mittelrhein will in future produce ecological energy for local residents just below the water level. (Zu dpa ""Floating Swarm of Electricity Buoys - Mini Power Plants in the Rhine"") Photo: Thomas Frey/dpa. - St. Goar/Rhineland-Palatinate/Germany

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