Facility
West Collector
It drains the upper watersheds of the left bank of the Bérard and Tré-les-Eaux bodies of water and brings the diverted water directly into the Emosson reservoir. It includes a 7944m long tunnel, 5.7m² section, uncut rock except for the fully lined apron.
South Collector
Although filling the reserve created by the dam requires a little over 220 million cubic metres, the Emosson's own catchment area only covers an area of 2.7 km². This is why almost all of this reserve is fed by a system of collectors draining towards the reservoir holding the waters of the Swiss and French valleys located North of the Mont-Blanc range.
East Collector
This collector is equipped for a maximum flow of 22.8 m3/s, has a total length of 18.3 km, set at an elevation of around 1550m.
Fouly water intake
The Fouly water intake is located on the Drance de Ferret at an elevation of 1576 metres. This is the first intake for the EAST collector. The catchment area of the intake structure covers 49.1 km².
Amône water catchment
The Amône water intake is the second intake of the EAST collector. Smaller than Fouly’s, it is situated at an altitude of 1572.5 metres.
Treutse-Bo water catchment
The Treutse-Bo water intake is the third of a series of six intakes on the EAST collector. After Fouly and Amône.
Planereuse water intake
The Planereuse water intake is the fourth intake of a series of six intakes on the EAST collector. After Fouly, Amône and Treutse-Bo.
Saleina water intake
The Saleina water intake is located on the Reuse de Saleina at an elevation of 1572 metres. It is the second most important EAST collector intake after Fouly.
Trient water intake
The Trient water intake, partially renovated in 2017 following a destructive avalanche, is located downstream of the Trient glacier on the Trient stream. It is the last EAST collector intake after the Esserts reservoir.
Argentière water intakes
The Argentière water intake is located under the glacier, upstream of a rocky ridge emerging among the columns of glacial ice, from which the Argentière waterfall originates.
Esserts reservoir
Built between 1971 and 1972, the Esserts reservoir holds water originating from Val Ferret. This water is collected and taken by the East collector to the basin.
Tour water intake
At Tour, the catchment area is located below the glacier front but is exposed almost everywhere to significant ice pinnacle collapses.
Belleplace
The Belleplace site includes a chamber composed of a butterfly valve and a reinforced shaft. Water is channelled into the reinforced shaft by means of a siphon at the lowest possible depression located downstream of the head valve.
Bérard water intake
First intake of the West collector, Bérard is situated at an altitude of 1992 metres.
Tré-les-Eaux water intake
The Tré-les-Eaux site is the second intake of the West collector and is a standard water intake capturing all water from the Vallon de Tré-les-Eaux.
Corbes
The Corbes site includes a chamber composed of two butterfly valves as well as two very distinct shafts. The first belonging to SBB and the second to Emosson.
Ravoire
Taking into account the 2.5m diameter butterfly valve chamber, the reinforced shaft consists of a section inclined at 90% along 921 metres and with a diameter varying between 2.7 metres and 2.5 metres. It emerges at the Bâtiaz power plant at a height of approximately 463 meters to supply the plant’s distributor.
Bassin du Châtelard reservoir
The Châtelard compensation basin is a gravity-type artificial structure covered with 6 centimetres of bitumen. It is located on the Franco-Swiss border.
Emaney water intake (SBB)
The Emaney water intake consists of a principal intake located at an altitude of 1903.80 metres (owned by SBB and operated by ESA).
Triège pumping station
The Triège pumping station on the left bank links Emaney to the Emosson dam. It consists of 3 pumps each with a flow of 600 litres/second.
Emosson dam
Located at the Col de la Gueulaz, the Emosson dam is the most important structure in the facility. It is fed with water from the Val Ferret via the East collector and artificially by the collectors of the Mont Blanc massif and the Aiguilles Rouges.
Bâtiaz power plant
The Bâtiaz hydropower plant is of a traditional type and situated in Martigny in Valais at 462 metres of altitude and was built in 1975.
Vallorcine power plant
The Vallorcine power plant forms part of the Electricité d’Emosson SA hydroelectric complex. This structure is located on the edge of the border on the right bank of the Eau Noire, near the village of Châtelard-Frontière, within the municipality of Vallorcine.
History
Activities
No Limits Canyon in Valais
Let the waters take you and explore the magical locations around the Emosson dam.
Eating out at the Emosson dam
Come and quench your thirst and enjoy a meal while enjoying a breathtaking view of Mont Blanc and the Emosson dam!
Cosmo Jazz Festival
Every summer since 2010, the site of the Emosson dam has been entranced by the rhythm of frenzied notes. The Cosmo Jazz festival, created by André Manoukian, drops off its music-lovers at the Emosson chapel and captivates the audience with jazzy tones for day like no other in the heart of the Emosson site in Valais.
Mountain bike/endurance trails
Come and discover the Emosson dam in Valais and its hikes on the balcony of Mont Blanc!
Vertic'Alp - with the funicular to the Emosson dam
A memorable climb and breathtaking experience on the Vertic'Alp funicular to discover Switzerland's second-largest dam in the Valais!
Walking trails in Valais
Come and discover the Emosson dam in Valais and its hikes on the balcony of Mont Blanc!
At the heart of the Emosson dam in Valais
Have you always wanted to visit a dam? Enter the lair of the concrete giant and discover all the measuring instruments hidden there. After this unique experience in Valais, Emosson and hydroelectricity will no longer be a mystery to you.
Emosson zipline
Are you seeking an intense experience? Throw yourself into the void on the Emosson zip line – you’re in for an EMOSSIONal experience!
In the footsteps of the dinosaurs
Meeting the first visitors to Emosson. Long before man was interested in the hydroelectric potential of the region, visitors of another kind and from another time frequented the location: DINOSAURS!
Know-how
Safety
Environment

Facility
- West Collector
  West Collector
- South Collector
  South Collector
- East Collector
  East Collector
- Fouly water intake
  Fouly water intake
- Amône water catchment
  Amône water catchment
- Treutse-Bo water catchment
  Treutse-Bo water catchment
- Planereuse water intake
  Planereuse water intake
- Saleina water intake
  Saleina water intake
- Trient water intake
  Trient water intake
- Argentière water intakes
  Argentière water intakes
- Esserts reservoir
  Esserts reservoir
- Tour water intake
  Tour water intake
- Belleplace
  Belleplace
- Bérard water intake
  Bérard water intake
- Tré-les-Eaux water intake
  Tré-les-Eaux water intake
- Corbes
  Corbes
- Ravoire
  Ravoire
- Bassin du Châtelard reservoir
  Bassin du Châtelard reservoir
- Emaney water intake (SBB)
  Emaney water intake (SBB)
- Triège pumping station
  Triège pumping station
- Emosson dam
  Emosson dam
- Bâtiaz power plant
  Bâtiaz power plant
- Vallorcine power plant
  Vallorcine power plant
History
Activities
- No Limits Canyon in Valais
  No Limits Canyon in Valais
- Eating out at the Emosson dam
  Eating out at the Emosson dam
- Cosmo Jazz Festival
  Cosmo Jazz Festival
- Mountain bike/endurance trails
  Mountain bike/endurance trails
- Vertic'Alp - with the funicular to the Emosson dam
  Vertic'Alp - with the funicular to the Emosson dam
- Walking trails in Valais
  Walking trails in Valais
- At the heart of the Emosson dam in Valais
  At the heart of the Emosson dam in Valais
- Emosson zipline
  Emosson zipline
- In the footsteps of the dinosaurs
  In the footsteps of the dinosaurs
Know-how
Safety
Environment

Vidéos