This actually exists using water. There's a pilot installation in southern Germany which has been running for a few years: https://www.naturspeicher.de/de/pilot

This actually exists using water. There's a pilot installation in southern Germany which has been running for a few years: https://www.naturspeicher.de/de/pilotprojekt/pilotprojekt.php https://www.naturspeicher.de/de/pilotprojekt/pilotprojekt.ph...