Submission + - 'A very Finnish thing': Sand battery starts storing wind energy in soapstone (euronews.com) 1
AleRunner writes: "The world’s largest sand battery has started working in the southern Finnish town of Pornainen" reports Euronews. "Capable of storing 100 MWh of thermal energy from solar and wind sources, it will enable residents to eliminate oil from their district heating network, thereby cutting emissions by nearly 70 per cent." "The sand can store heat at around 500C for several days to even months, providing a valuable store of cheaper energy during the winter. When needed, the battery discharges the hot air — warming water in the district heating network. Homes, offices and even the local swimming pool all benefit in Kankaanpää, for example." later it says that most kinds of sand can be used and "In Pornainen, Polar Night Energy has found a sustainable material in crushed soapstone; a by-product of a Finnish company’s manufacture of heat-retaining fireplaces.". The company has more technical data and an FAQ on their web site.