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Alpiq in: Europe

Grande Dixence

Grande Dixence storage lake

The Grande Dixence facility collects the runoff from 35 glaciers in the canton of Valais. The jewel in the facility's crown is the Grande-Dixence dam, the highest gravity dam in the world. The water from the reservoir plummets down to the Fionnay and Nendaz power stations. The volume of electricity produced by Grande Dixence corresponds to one fifth of the storage energy generated in Switzerland.


Fionnay power plant - alt. 1490 m

6 x 2 Pelton turbines – Total capacity: 290 MW
Gross head: 874 m


Nendaz power plant - alt. 478 m

6 x2 Pelton turbines – Total capacity: 390 MW
Gross head: 1008 m

The Grande Dixence facility is supplemented by facilities belonging to Cleuson-Dixence (Bieudron power station) and Chandoline power station.


Staumauer Grande Dixence

Grande Dixence dam - alt. 2365 m

Built: 1951 - 1961
Commissioned: 1961
Type: gravity dam
Height: 285 m
Crest: 700 m
Reservoir capacity: 400 mn. m3
Area: 4.04 km2
Catchment area: 46.3 km2


Ferpècle dam - alt. 1896 m

Built: 1962
Commissioned: 1964
Type: arch dam
Height: 25.5 m
Crest: 91 m
Reservoir capacity: 100 000 m3
Area: 1.1 ha


Z’Mutt dam - alt. 1972 m

Built: 1961
Commissioned: 1964
Type: arch dam
Height: 74 m
Crest: 144 m
Reservoir capacity: 800 000 m3


Pumping stations

Arolla – altitude 2009 m
Volume of compensating basin of la Maya 17,300 m3
Capacity 48.6 MW, max. discharge rate 12.6 m3/s

Ferpècle – altitude 1896 m
Volume of dam 100 000 m3
Capacity 21.3 MW, max. discharge rate 8.4 m3/s

Stafel - altitude 2180 m
Volume of compensating basin 80,000 m3
Capacity 26.4 MW, max. discharge rate 9.9 m3/s

Z'Mutt - altitude 1972 m
Volume of dam 800,000 m3
Capacity 88 MW, max. discharge rate 17.4 m3/s


Storage Power Plants


Switzerland


Fionnay, Riddes, VS


Fionnay: 6 x 2 Pelton turbines / Nendaz: 6 x 2 Pelton turbines


680 MW


Alpiq: 60 %


1961 - 1965

2,000 GWh together with Bieudron (Cleuson-Dixence)


Yes


in service