Finland just made a groundbreaking leap in green tech. In the town of Pornainen, a massive “sand battery” deve
[ad_1] Finland just made a groundbreaking leap in green tech. In the town of Pornainen, a massive “sand battery” developed by Polar Night Energy is turning excess wind and solar energy into stored heat. Packed with about 2,000 tonnes of crushed soapstone, this silo-sized system can heat up to 500°C, holding that thermal energy for […]