The Franco-Swiss development, because of the source of capital, uses different pumping water sites and power generation plants.

The West Collector picks up the waters of the French vallies of Bérard and Tré-les-eaux.

These waters are channelled by free-flow in a gallery of 7.95 km (4.94 mi) directly to the dam.

The East Collector captures waters of La Fouly and below the Trient Glacier and led by a gallery of more than 18 km (11 mi) long to the Esserts basin, hence the water is either turbined directly at the Vallorcine power station, or pumped into the Émosson reservoir.

[3] The dam is located in the Canton of Valais, on the left bank of the Rhône above Martigny.