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A one-of-a-kind construction project

Construction of the Nant de Drance pumped storage power plant began over ten years ago, in 2008, and the complex will be fully operational in 2022. It’s a high-altitude, large-scale project, with 17 km of tunnels, 1.7 million m3 of rock excavated, up to 400 workers on site, and an investment of more than CHF 2 billion.

Construction film

Vieux Emosson reservoir

Vertical penstocks

The power house cavern

The transformer cavern

Access shafts

Emosson reservoir