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

submitted 9 months ago by Ninjazzon@infosec.pub to c/technology@lemmy.ml

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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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[–] wewbull@feddit.uk 23 points 9 months ago (12 children)

2MW is a measure of power, not energy.

Time for something to free fall 1.4km is about 17s, so the minimum capacity is 34MJ or 9.4kWh in order to make their statements true. $1.50 in electricity.

[–] thedevisinthedetails@programming.dev 1 points 9 months ago (1 children)

I sincerely doubt this is accurate or why would they even bother.

[–] wewbull@feddit.uk 7 points 9 months ago

All solid weight gravity batteries are a scam. The sound good enough to get grant money, but if you run the numbers, they are pitiful batteries.

To make it worth while you need literal lakes of water.

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