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Europe’s deepest mine to become giant gravity battery (www.independent.co.uk)

submitted 10 months ago by [email protected] to c/[email protected]

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An abandoned mine in Finland is set to be transformed into a giant battery to store renewable energy during periods of excess production.

The Pyhäsalmi Mine, roughly 450 kilometres north of Helsinki, is Europe’s deepest zinc and copper mine and holds the potential to store up to 2 MW of energy within its 1,400-metre-deep shafts.

The disused mine will be fitted with a gravity battery, which uses excess energy from renewable sources like solar and wind in order to lift a heavy weight. During periods of low production, the weight is released and used to power a turbine as it drops.

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[–] [email protected] 3 points 10 months ago

Yes, and they use lakes of water to have enough mass to make it worthwhile. No weight down a mineshaft is worth it.