Finnish researchers have developed the first fully operational "sand battery” that can store renewable energy for months. According to scientists, the new battery can solve one of the big problems of renewable energy: ensuring continuous supply all year round. The device uses low-grade sand, which is heated by solar or wind energy. The sand stores heat at a temperature of 500°C, which can be used to heat homes in winter, when energy is more expensive. Finland imports most of the gas it consumes from Russia. And the war in Ukraine has intensified interest in viable alternatives. Perhaps this can be one of them.
