I didn't have time to read the whole thing so I don't know if they mention it, but another article about about using sand as heat storage pointed out one of the advantages is that the material isn't toxic, unlike chemical batteries.

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pbhjpbhj 2 days ago | parent [-]

There were reports last year, IIRC, of "sand shortages". Presumably a logistics infrastructure problem that could be relatively easily overcome?

	▲	coryrc 2 days ago \| parent \| next [-]
		That's of "sharp sand". Sand batteries don't need sharp sand.
	▲	carlos_rpn 2 days ago \| parent \| prev [-]
		I remember those reports. I wonder if it has to be the same kind of sand, or could be some that we neither have another use for, nor would damage any ecosystem (too much).