this post was submitted on 28 Jul 2026
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Finland builds the world's largest sand battery. Site can cheaply store energy for entire month. No "rare earths" or critical materials used. Estimated at $25/KWh (www.cnbc.com)
submitted 9 hours ago by Lugh@futurology.today to c/futurology@futurology.today
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[–] Flower@sh.itjust.works 2 points 6 hours ago

discharged via heat exchangers to warm water for the local district heating network.

It needs certain infrastructure to work.

You could also use it to generate electricity. That's 20-40% efficient. With negative prices in summer these days that would still be interesting.