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
Capacity
166 000 m3
Power plant
Number of turbines
6 x 2 Pelton
Output
290 MW
Flow rate
45 m3/s max.
Drop height max.
873,8 m
Drop height min.
679,8 m
Transformers
9 x 40 MVA (single-phase) – 220 / 15 kV
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xACCESS ROAD REOPENS ON AUGUST 9The reopening of the access road to Grande Dixence is confirmed for Saturday, August 9. The site will be open to the public as usual: guided tours of the interior of the dam, cable car, pavilions, and dam hotel-restaurant. The AlpinLine zip line will not be operational for the time being. We look forward to seeing you again!
The traveling exhibition celebrating the 75th anniversary of Grande Dixence SA is constantly on the move. Discover the upcoming dates here.
