Serre-Ponçon dam © Remi Fabregue Agence Kros

Large dams

The main water reservoirs on the route.

With 10% of the electricity consumed, hydroelectricity is France's second-largest source of electricity after nuclear power, and the leading source of renewable electricity. Much of this energy is produced by dams, which create reservoirs by retaining part of the water in the rivers on which they are built. On Route des Grandes Alpes®, discover the great Alpine dams and the great lakes they have created.

The Chambon dam and lake

Located in Isère, between Bourg d'Oisans and the Col du Lautaret, it was impounded in 1935. Standing 90 m high and 137 m long, it is located overlooking the resort of Les 2 Alpes, and has been awarded the "Patrimoine du 20ème siècle de l'Isère" label.

EDF Hydrelec Museum

In the heart of the Oisans, on the shores of Lac du Verney, a little downstream from the Grand'Maison dam and on your route, the EDF Hydrelec Museum invites you to experience the magical story of water becoming electricity. A permanent collection of exceptional collectibles and spectacular machinery brings to life a breathtaking industrial adventure.


The map