Finland has activated the world's largest sand battery in Pornainen, an industrial-scale thermal storage system that stores renewable energy as heat. This 13-meter-tall silo holds 2,000 tonnes of crushed soapstone, capable of storing 100 MWh of energy for weeks or months. Surplus electricity from wind and solar powers a resistive heater, which sends hot air through pipes to heat the soapstone to temperatures between 500°C and 600°C. This high-temperature heat is retained with a round-trip effici

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