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More than 400 employees, nearly ten years of underground construction in the high mountains, 17 km of tunnels and 1.7 million m³ of removed rocks: The Nant de Drance construction project in the Valais region, which began in September 2008, is enormous. The result is one of Europe's most powerful pumped storage power stations. With an output of 900 MW, the power plant will generate 2.5 billion kWh of electricity following system check out in 2019. The Kraftanlagen Group is involved in multiple partial projects at this once-in-a-generation construction site.
For example, Kraftanlagen had been tasked with the installation of six Francis turbines with 150 MW each. Included in the scope of our services is the installation of the equipment for air and oil as well as the piping of the generator and the control system with approx. 9,500 metres of pipelines and the supply of the pipeline material. During the project, up to 60 employees, including overhead and sub-contractors, will be working on site.
The Nant de Drance pumped storage power plant uses the existing altitude between two reservoirs to generate and store energy. During times of peak consumption, the water stored in the Vieux Emosson reservoir is used to generate power by being run through two 425 m high vertical shafts to the turbines of the underground power plant and then on to the Emosson reservoir. When demand is low, however, the water is pumped back from Lac d'Emosson to the Vieux Emosson reservoir. This way, the power plant allows electricity to be stored.
GE Renewable (Switzerland) GmbH
Period of execution:
12/2017 – 08/2019
Scope of services: