Finland has inaugurated an industrial-scale sand battery this week in the southern town of Pornainen, where it'll take over heating duties from an old woodchip power plant for the municipality. It's set to reduce carbon emissions from the local heating network by as much as 70%, and is the largest…
The ground is… 4C or something? Would it lose more heat more easily to the solid ground, than to the air?
Its probably easier to keep it dry above ground too.