Battery power from mere "sand"? Finland's Polar Night Energy says absolutely yes - Neowin
Startup is building a giant sand battery in Finland
First commercial-scale sand battery goes online in Finland
Climate change: 'Sand battery' could solve green energy's big problem - BBC News
COMSOL on X: "🌇 🌃 Finnish buildings are being warmed throughout the night by solar energy thanks to a “heat battery” filled with sand! Dig into Polar Night Energy's promising heat storage
Finland Launches World's First Commercial "Sand Battery"
How a sand battery could transform clean energy
Can sand batteries be scaled commercially? | Energy Magazine