In Finland, this giant battery is helping heat apartments and offices—using sand
In a Finnish town best known for its quiet streets and close-knit community, a towering silo of crushed stone is quietly rewriting the energy playbook. Pornainen has switched its district heating system from oil to what’s being called the world’s largest sand battery—a system that stores excess renewable electricity as heat in thousands of tons of stone. The result: hot showers, warm classrooms, and city offices powered without fossil fuels, offering a glimpse of how even small towns can pioneer big climate solutions. Adele Peters with Fast Company has the full story.
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