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The heart of these plants is the Valle di Lei reservoir, with a capacity of 197 million cubic metres of water. The water is held back by an arch dam with a maximum height of 138 metres and a crown length of 635 metres. Virtually the entire reservoir – including the natural catchment area where around one third of the reservoir’s water originates – is located in Italy. Around two thirds of the water is fed from the Avers, Madris and Niemet valleys or pumped up from the Ferrera station.
Storage power plant
Sils, Thusis, Bärenburg, Ferrera, Switzerland
|Number of turbines:|
Ferrera: 3 Francis turbines / Bärenburg: 4 Francis turbines / Sils: 4 Francis turbines / Thusis: 2 Francis turbines
Average annual production: