World's first commercial sand battery installed in Finland
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Polar Night Energy and Vatajankoski, an energy utility based in
Western Finland, have installed sand-based thermal energy storage, the
world's first commercial solution to store electricity in the sand as
heat to be used in a district heating network. The sand battery, which
has a hundred tons of sand inside, is placed in Vatajankoski's power
plant area, and it provides heat for Vatajankoski's district heating
network in Kankaanpaa.

https://www.inceptivemind.com/worlds-first-commercial-sand-battery-installed-finland/25335/

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