Developers of the $2.30 billion Nant de Drance plant in the canton of Valais say the facility operates like a giant battery
Switzerland is adding a much needed cog in the wheel to its energy supply with an underground hydropower plant that says it has capacity to store enough electricity to charge 400,000 car batteries simultaneously.
Its six turbines tucked in a cavern 600 metres below ground between the Emosson and Vieux Emosson reservoirs have capacity of 900 MW, making it one of the most powerful pumped storage plants in Europe. The Vieux Emosson and Emosson dams are pictured above of the newly operational Nant de Drance pumped storage electricity power plant in Finhaut, Switzerland, on August 4.“In doing so, there are losses like any storage, but the yield is very good. We have about 80% efficiency over the complete cycle,” director Alain Sauthier told Reuters on a tour this week.It takes less than five minutes to switch from full pumping mode to full power generation.
Typically the plant pumps water into storage in the afternoon, at night and on weekends, then generates power in the morning and evening when prices are higher, Sauthier said.
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