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Austrian hydro power tunnel project awarded to Hochtief

Hochtief has won a €132M (£104M) contract to construct the Triebwasserweg Maria Stein tunnel for a new hydropower development in Prutz, Austria.

The 22.6km long pressurised tunnel has a diameter of 6.5m and is to be an integral part of the Gemeinschaftskraftwerk Inn hydroelectric power plant, which is being developed by Verbund, Tiroler Wasserkraft and Engadiner Kraftwerke.

Hochtief will drive the tunnel with two hard rock double-shield tunnel boring machines and will be lined with locally produced, prefabricated concrete lining segments.

After being completed in 2018 the tunnels will channel water from the reservoir in Ovella to the powerhouse in Prutz which will have the capapcity to generate enough electricity to power 100,000 households.

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