Polar Night Energy says it’s developed and commercialized a super-cheap, super-simple way of storing energy for anywhere between hours and months, simply using heated sand. Its first 8-megawatt-hour thermal battery has gone online in Finland.
— Read on newatlas.com/energy/sand-battery-polar-night/

If only our leaders could see merit of this here, hydronic cooling as well as heating, heat pump exchange with sea. We do have geothermal here, heat exchange with soil so why not with sea water, so much more efficient, for civic buildings as well as swimming pools, as well as commercial industrial as well as….

“But there’s a surprising amount of district heatinggoing on. Nearly half of all Scandinavian homes incorporate some form of it, and it can be found in many other areas too, including Northern China and the USA.”