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Finland has developed a groundbreaking “sand battery” that stores large amounts of renewable electricity as heat inside massive towers filled with ordinary sand. This simple yet powerful technology provides long-duration energy storage that is far cheaper, safer, and longer-lasting than traditional lithium batteries—especially during winter when energy demand peaks. • The system uses excess solar and wind energy to heat sand to 500–600°C, storing thermal energy for months at a time. • Sand can h
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