Zervreila AG power plants

Kraftwerke Zervreila AG utilises the hydropower of a 200 km2 catchment area in the upper Valsertal and Safiental valleys. The centrepiece of the plant is the Zervreila reservoir with its 151 m high arch dam with a crest length of 504 m and a capacity of 100 million m3. This reservoir allows the summer inflows of the Valser Rhine above the dam site and the right-bank side streams up to the Peilerbach to be stored. The storage water is used for the first time in the Zervreila centre located at the foot of the dam. Through the transfer tunnel with an absorption capacity of 20 m3/s, it reaches the Wanna equalisation basin in the rear Safiental for further use. The process water from the Safien Platz equalisation basin is channelled out of the valley through another pressure tunnel and finally through the Heinzenberg to Domleschg, where it is processed in the Rothenbrunnen control centre with a gradient of around 673 m. Three horizontal machine sets with twin Pelton turbines each generate 44 MW of power. After transformation to 220 kV, the energy from all plant stages is transferred to the Swiss high-voltage grid in the Rothenbrunnen open-air switchgear.

Guided tours

Monday - Friday. Register online at: www.kwz.ch