Switzerland spent 14 years and €2 billion on this 'water battery'

A water battery capable of storing electricity equivalent to 400,000 electric car batteries will begin operating in Switzerland next week.

It can store excess electricity by pumping water from the lower pool up to the higher pool, effectively “charging” the battery. When electricity is needed, the direction of the water is reversed. The flow of water rotates a turbine which generates hydroelectric power.

The plant has six pump turbines and a total power output of 900 MW, enough to power as many as 900,000 homes.

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