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It's an interesting idea, but getting the heat out of the rocks quickly is an engineering hurdle.

It's an interesting idea, but getting the heat out of the rocks quickly is an engineering hurdle.

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[–] • 1 pt

These guys from Finland are working on a sand battery idea. https://polarnightenergy.fi/sand-battery

[–] • 0 pt

They installed some of those at Fort Carson in Colorado. I've been following the progress to see how well they work.