Grand'Maison Dam
| Grand'Maison ppp | |
|---|---|
Grand'Maison ppp Location of Grand'Maison ppp in France | |
| Official name | Barrage de Grand'Maison |
| Country | France |
| Location | Vaujany, Isère |
| Coordinates | 45°12′21″N 06°07′01″E / 45.20583°N 6.11694°E |
| Status | Operational |
| Construction began | 1978 |
| Opening date | 1985 |
| Owner | Électricité de France (EDF) |
| Dam and spillways | |
| Impounds | Eau d'Olle |
| Height (foundation) | 160 m (525 ft) |
| Height (thalweg) | 140 m (459 ft) |
| Length | 550 m (1,804 ft) |
| Dam volume | 12,000,000 m3 (15,695,407 cu yd) |
| Reservoir | |
| Creates | Lac de Grand Maison |
| Total capacity | 140,000,000 m3 (113,500 acre⋅ft) |
| Power Station | |
| Commission date | 1987 |
| Hydraulic head | 955 m (3,133 ft) (max, lower plant) |
| Turbines | 4 x 150 MW Pelton-type 8 x 150 MW Francis pump turbine |
| Installed capacity | 1,800 MW |
| Annual generation | 1,420 GWh |
The Grand'Maison Dam is an embankment dam on L'Eau d'Olle, a tributary of the Romanche River. It is located in Vaujany of Isère within the French Alps. The primary purpose of the dam is to serve as the upper reservoir for a pumped-storage hydroelectric scheme where Lac du Verney located lower in the valley is the lower reservoir. The dam was constructed between 1978 and 1985 with its power station being commissioned in 1987. With an installed capacity of 1,800 MW, it is the largest hydroelectric power station in France.