The Nant de Drance Hydropower Plant is a pumped-storage power station in the canton of Valais in Switzerland.

[2] On 25 August 2008, the Swiss Federal Department of Environment, Transport, Energy and Communications granted a building permit to Nant de Drance SA for the construction of the plant with a 600 MW design.

Preliminary construction began in September 2008 but a concession was granted in April 2011 which allowed for a larger 900 MW plant.

The lower reservoir is 4 km (2.5 mi) long and when full, lies 1,930 m (6,330 ft) above sea level.

To accomplish this, when energy demand is high, water is released from the upper reservoir, down a series of 425 m (1,394 ft) penstocks to the six 150 MW reversible Francis turbine-generators in the power plant.