By Mark S. Kuhar, Editor of ROCK PRODUCTS Magazine A town in Finland is using sand sand batteries to provide home heating during winter. Sand batteriehttps://green-cincinnati.com/sand-batteries-may-be-an-energy-saver/s, you say? Tens of thousands of cubic meters of sand are heated from the generation of electricity with solar panels or wind turbines. Packed tightly in insulated silos, the sand can retain this heat …
