Nant de Drance Hydropower Plant
| Nant de Drance | |
|---|---|
Lac d'Emosson forms the lower reservoir | |
| Country | Switzerland |
| Location | Finhaut, Saint-Maurice, Valais |
| Coordinates | 46°03′49″N 06°54′36″E / 46.06361°N 6.91000°E |
| Status | Operational |
| Construction began | September 2008 |
| Opening date | July 2022 |
| Construction cost | US$2.1 billion (CHF 1.9 billion, €1.5 billion) |
| Owner(s) | Nant de Drance SA |
| Upper reservoir | |
| Creates | Lac du Vieux Emosson |
| Total capacity | 25,000,000 m3 (20,000 acre⋅ft) |
| Lower reservoir | |
| Creates | Lac d'Emosson |
| Total capacity | 227,000,000 m3 (184,000 acre⋅ft) |
| Power Station | |
| Hydraulic head | 295 m (968 ft) |
| Pump-generators | 6 x 150 MW reversible Francis-type |
| Installed capacity | 900 MW |
| Annual generation | 2,500 GWh (est.) |
| 20 GWh energy storage | |
The Nant de Drance Hydropower Plant is a pumped-storage power station in the canton of Valais in Switzerland. It is within the municipality of Finhaut, district of Saint-Maurice and about 14 km (8.7 mi) southwest of Martigny. Construction on the power plant began in 2008 and it began operations in 2022. It is owned by Nant de Drance SA, a consortium of Alpiq (39%), SBB (36%), Industrielle Werke Basel (15%) and Forces Motrices Valaisannes (FMV) (10%). The US$1.9 billion plant has an installed capacity of 900 MW and an energy storage capacity of 20 GWh.