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We went to Finland to hear about the new 'sand battery' that will turn stored renewable energy back into power for the electrical grid (www.livescience.com)

submitted 4 days ago by solo@slrpnk.net to c/energy@slrpnk.net

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[–] solo@slrpnk.net 2 points 4 days ago

I did a little bit of digging on this and if it looks like sand batteries are a subcategory of thermal batteries, which in their turn are part of what is called thermal energy storage . Wiki mentioned something that I found fascinating and that I totally didn't know:

Thermal batteries are very common, and include such familiar items as a hot water bottle. Early examples of thermal batteries include stone and mud cooking stoves, rocks placed in fires, and kilns.