The water held by the Grande Dixence dam is transformed into electricity over two levels. The first level is the underground Fionnay plant. A 9 km tunnel with a slight gradient was constructed to transport the water to its turbines.

The compensating basin, which is located in Louvie in the Val de Bagnes valley, is connected to a pressure shaft that descends 800 metres at a gradient of 73%. The pressure shaft emerges in the flow divider at the Fionnay power station, a vast cavern hollowed out of the rock.

Compensating basin

Capacity166 000 m3

Power plant

Number of turbines6 x 2 Pelton
Output290 MW
Flow rate45 m3/s max.
Drop height max.873,8 m
Drop height min.679,8 m
Transformers9 x 40 MVA (single-phase) – 220 / 15 kV
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