This water flows past the Krün hydroelectric plant in an open channel, through a culvert, under the B 11 road at Wallgau and then via a tunnel to the Sachensee lake (867 m/2,844 ft).

At the end the water enters the hydro-electric power plant at (795 m/2,608 ft), propels the turbines, and finally flows into the lake.

After crossing the border between Tirol and Bavaria, and immediately after the inlet of the Fermersbach, a 6960 m lug carries water to the hydro-electric power plant at Niedernach at the southeast end of the Walchensee.

If the water level in winter falls due to outflow through the Walchensee power station, use of the road by trucks is limited by weight restrictions.

In spring plant operators are obligated to increase the water level again in such a way that traffic restrictions — primarily affecting tourism — can be lifted or penalties are imposed.

[5] From the outset, demand for power was so great that hydroelectricity could only provide a third of the required output, with the balance being supplied by traction engines.

Bayernwerk was later denationalised and taken over by VIAG (Vereinigte Industrieunternehmungen) and as a result the power station is now operated by E.ON Wasserkraft GmbH.