From: here@is.invalid   
      
   World's first commercial sand battery installed in Finland   
   ...   
   ...   
   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-batte   
   y-installed-finland/25335/   
      
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