Disused mine in Finland is being turned into a gravity battery to store renewable energy
The firm has developed an energy storage system that raises and lowers weights, offering what it says are “some of the best characteristics of lithium-ion batteries and pumped hydro storage”.
When there is excess power - from wind turbines on a windy day for example - weights would be winched up the Pyhäsalmi mine’s 530-metre auxiliary shaft. To generate energy, these weights can be released turning the winches into generators creating either a short burst of electricity or a slower trickle depending on what is needed.
The gravity energy system would be able to store 2MW of power and integrate into the local energy grid.
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