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Finland’s radical answer to renewable energy’s biggest headache: The world’s largest sand battery (www.cnbc.com)

submitted 2 days ago by eicker@lemmy.world to c/europe@feddit.org

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[–] atro_city@fedia.io 4 points 2 days ago (10 children)

Not to take away from the achievement, but how long can heat be stored though? Isn't pumped hydro a better solution?

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[–] joelthelion@lemmy.world 6 points 2 days ago (2 children)

I think pumped hydro is already maxed out in many locations, and a lot more complex/expensive if you only need to store heat (and not electricity).

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[–] Tar_alcaran@sh.itjust.works 5 points 2 days ago (1 child)

Also, some of us live in, for example, the Netherlands. Pumping two meters of water floods half the country.

And turning a valley into a lake is pretty terrible for the ecology. Adding pumps to existing hydroelectric dams is a great thing, but making new ones is... Hard to sell

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[–] Munkisquisher@lemmy.nz 2 points 1 day ago

Australia is using old mines, and has pretty much maxed out the supply of usable ones

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