Lagobianco pumped storage plant

On you can now find the new film about the project.

1,000 MW pumped storage plant in the Upper Poschiavo Valley

Repower plans to build a 1,000 megawatt pumped storage power plant in the Upper Poschiavo Valley. Developed in consultation with environmental organisations as an alternative to previous plans, the new, high-capacity installation will replace an earlier project known as Projekt 95. It will use two lakes – Lago Bianco on the Bernina Pass and Lago di Poschiavo – as reservoirs. An 18 kilometre pressure tunnel on the right flank of the Poschiavo valley and a pressure duct around 2.5 kilometres long will take the water to a powerhouse in Camp Martin on Lago di Poschiavo. The plant will be connected to the grid via the existing 380 kilovolt international line.

In 2010 Repower submitted the concession project. At the end of October 2010, voters in the municipality of Poschiavo voted in favour of the concession agreements. On 13 December 2010 voters of Pontresina also approved the Lagobianco project. At the end of 2011 the request for concession approval was submitted to Canton of Graubünden which granted concessions in spring 2014. One year later Repower submitted the application for approval of the Lagobianco project to the Canton Graubünden authorities. On 25 October 2016 the Canton Graubünden government approved the Lagobianco project. Given that it is not possible to deliver the pumped-storage plant in the current market environment, Repower plans to first renovate the existing plants.

What is a pumped storage plant?

The planned pumped storage plant will generate electricity at periods of particularly high demand. During these periods, water will flow downhill to drive turbines in the powerhouse. It will work the other way round during periods of low demand, where available electricity will be used to pump the water back up, ready to drive the turbines again at a later stage.

Technical data

Installed capacity1,000 MW
Length of pressure tunnel18 km
Length of pressure duct2.5 km
Construction time6 - 7 years approx.
Total investmentCHF 2.5 bn +/- 10%