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Finland warms up the world’s largest sand battery, and the economics look appealing
(techcrunch.com)
this post was submitted on 17 Jun 2025
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They use resistive heating, so they can only charge it dirt cheap when there is surplus solar or wind.
Okay, I guess the heat pumps aren't suitable due to the economics or maybe cannot reach high enough temperatures.
As much as I've understood, yes - heat pumps have difficulty with reaching high temperatures.