EnBW, VIW completes the construction of 360 MW Obervermunt II pumped-storage hydropower project in Montafon

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EnBW Energie Baden-Württemberg AG and Vorarlberger Illwerke (VIW) has started the operation of the Obervermunt II pumped storage power plant in Montafon, Austria.

The Obervermunt II was built with the support of EnBW AG in a mere four and a half years. With its two turbines and two pumps, Obervermuntwerk II achieves an output of 360 megawatts. The plant uses the existing water reservoirs, Lake Silvretta and Lake Vermunt, which also continue to be used by the storage power plant Obervermunt I (about 36 megawatts) that was built in the 1940s. 

The Obervermunt II (height 33 metres, width 25 metres, length 123 metres) is located at the end of an 800-metre-long tunnel inside the Silvretta Massif. The cavern is the starting point of the about 3-kilometre-long underground Silvretta gallery (excavated diameter almost 8 metres) and part of a complex tunnel and gallery system up to Lake Silvretta at Bielerhöhe – the highest point of the well-known Silvretta High Alpine Road.

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