Grand'Maison Dam

Grand'Maison Dam is a large embankment dam in the French Alps that stores water in a vast reservoir. Concrete and rock materials form the barrier, creating a human-made lake that supplies hydroelectric power.

The dam was built during the 1980s as a major French hydroelectric project. It marked a shift toward expanding clean energy production in the Alpine region.

The site shows how energy infrastructure fits into the mountain landscape and serves the daily needs of surrounding communities. Water storage here plays a practical role in powering homes and industries across the region.

The best time to visit is during spring and autumn when weather and access conditions are most favorable. Tours are available and provide explanations about how the hydroelectric system works.

The dam works as part of a network that moves water between different elevations across the Alpine region. This allows it to store and release energy precisely when demand is highest.

Location: Auvergne-Rhône-Alpes

Location: Vaujany

Inception: 1987

Operator: EDF

GPS coordinates: 45.20278,6.11667

Latest update: December 20, 2025 12:29