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The new Cleuson-Dixence hydropower complex enables production to be concentrated over just 1,000 hours, thus multiplying Grande Dixence’s generating capacity by 2.5. This enables the output of a large nuclear power plant to be fed into the very high voltage grid in just three minutes. Cleuson-Dixence is operated by HYDRO Exploitation SA.
Built entirely underground between 1993 and 2000 by EOS SA (now Alpiq Suisse SA) and Grande Dixence SA with total investments of CHF 1.3 billion, the power plant complex comprises:
a new water catchment drilled into the Grande Dixence dam
a 15.8 km long feed tunnel
a surge tank dug into the Dent-de-Nendaz mountainside
a 4.3 km steel-lined pressure shaft
the Bieudron underground power station
3 Pelton turbines – total capacity: 1,269 MW (1,395 MVA)
Gross head: 1883 m
380 kV grid connection
The operation of the Cleuson-Dixence complex is closely linked to the Grande Dixence SA facility.
The Cleuson-Dixence complex was out of service for nine years. Following completion of the repair work, it was put back into operation in January 2010. It is operated by HYDRO Exploitation SA.
Type: Gravity dam
Constructed: 1951 - 1961
Height: 285 m
Crest: 700 m
Reservoir capacity: 400 million m3
Area: 4.04 km2
Catchment area: 46.3 km2
Storage power plant
Bieudron station, Riddes, Switzerland
|Number of turbines:|
3 Pelton turbines
2,069 MW together with the Grande Dixence complex
Cleuson-Dixence eG: 72.7%
(31.8% direct, 40.9% via participation in Grande Dixence SA)
Average annual production:
2000 GWh together with the Grande Dixence complex