🇫🇮 THIS GIANT SAND BATTERY HEATS A WHOLE TOWN IN FINLAND It’s literally a 15-meter-tall container full of hot sand that stores enough heat to power homes, offices, and even a swimming pool for a month. When there’s extra solar or wind power, it turns that into heat and stores it in crushed soapstone at 500°C. The result? A 70% drop in emissions for the whole district. Who knew saving the planet would involve a giant sandbox? Source: James Stewart IG