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

submitted 7 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] 4 points 7 months ago* (last edited 7 months ago) (1 children)

Yeah, I was imagining it would probably work better with water instead. Sand can't be pumped (or turbined lol), and I noticed those many enormous trucks carting the sand around underground which seems to introduce an enormous efficiency loss to the system. Good to see the fundamental concept works well in practice, thank you.

[–] [email protected] 2 points 7 months ago

Yeh, again I’m not sure how efficient using water is but my instinct says it will be a lot better than any mechanical system as they are generally very inefficient!