Set at the foot of the Mattertal, the Z’Mutt pumping station (alt. 1972 m) is the most powerful within the Grande Dixence complex. It is fed by water from the Bis and Schali glaciers which rise above the Visp river, and from the Gorner glacier.

Four pumps with a total power of 88 MW are used at Z’Mutt to pump around 140 million m3 of water every season. This water is pumped to a penstock which carries it to the Trift tunnel (altitude of 2400 metres) in the main collector.

The impact of the concrete on the environment has been kept to a minimum. The only major visible element is the arch dam which crosses the gorge. Apart from the service building, all of the facilities (gravel traps, sand traps and pumping station) are underground.

Afterbay reservoir

Construction1961 – 1964
Height74 m
Crest144 m
Thickness at the crest3 m
Volume of concrete32 000 m3
Capacity800 000 m3
TypeArch dam

Pumping station

Power2 x 30 MW ; 2 x 14 MW
Flow rate17,4 m3/s
Discharge head365 m / 470 m
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