Who needs rare earths? Finland just built a sand battery that can cover a whole town’s heating demands for a week in winter and a month in summer. www.cnbc.com/2026/07/25/finland-sand-battery-renew…
Sand battery: Finland’s radical answer to a renewable energy headache
A small Finnish town has turned to the world's largest commercial sand battery to tackle a major hurdle in the energy transition: intermittency.