HOCHTIEF to build large tunnel project in Tirol for EUR 132 million

Aug 11, 2014

"Triebwasserweg Maria Stein" tunnel is most significant single contract for hydroelectric power station "Gemeinschaftskraftwerk Inn"

From Gemeinschaftskraftwerk Inn GmbH - consisting of Tiroler Wasserkraft AG, Engadiner Kraftwerke AG and Verbund AG - HOCHTIEF Solutions was awarded the contract for constructing the "Triebwasserweg Maria Stein" tunnel. The project is a key element of the "Gemeinschaftkraftwerk Inn" power station. The contract value is EUR 132 million. The construction lot comprises driving of a more than 22-kilometer-long pressure tunnel and is the biggest and most significant one of the three construction lots of the hydroelectric power station on the River Inn. The tunnel will be completed in mid-2018.

Wilfried Rammler, General Manager of HOCHTIEF Infrastructure: "We are happy to have won another large-scale contract in the Austrian market. This underscores our competence in the construction of sustainable energy infrastructure in Europe."

The pressure tunnel with a total length of 22.6 kilometers and a diameter of 6.5 meters will run underground from the reservoir in Ovella to the powerhouse in Prutz. HOCHTIEF will drive the pressure tunnel with two hard rock double-shield tunnel boring machines. The excavation material will be stored near the construction site in order to reduce site traffic to a necessary minimum. The tunnel will be lined with prefabricated concrete lining segments. These reinforced concrete elements will be produced locally in a field factory. In future, the water will be channeled through the tunnel to the powerhouse in Prutz where, once the structure is completed, environmentally friendly electrical power will be generated for more than 100,000 households.

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