Joint power plant “Inn” (CH/AT)

Joint power plant “Inn” in the border region between Switzerland and Austria.

In cooperation with Erdbau Spöttl, 90 piles with a diameter of 1200 mm were cut (milled) with Brextor® in Nauders (AT).

The “Inn” joint power plant in the border region between Switzerland and Austria is the largest newly built run-of-river power plant in the Alpine region for many years, which extends largely underground from Martina (CH) in the municipality of Valsot across seven municipalities in the Upper Inn Valley to Prutz (AT) in Tyrol.

The dam with the 15 m high weir is located below the village of Martina. The water collected there is fed to the turbines in the Prutz power plant in a pressure tunnel over 23 km long. The construction of the weir system was repeatedly delayed due to difficult geological and climatic conditions. The power plant, pressure tunnel and weir system have now been completed after a construction period of almost eight years.

The “Inn” joint power plant, 14% of which is owned by Engadiner Kraftwerke AG and 86% by TIWAG-Tiroler Wasserkraft AG, was officially opened on November 4, 2022, at a ceremony in the powerhouse in Prutz.

With an energy production of 440 gigawatt hours per year, the GKI can cover the electricity needs of around 90,000 households.

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