Finland's Sand Battery Cuts Emissions 70% Without a Single Rare Earth | OilPrice.com Haley Zaremba Haley Zaremba is an energy journalist and researcher with more than a decade of professional experience covering global energy systems, land and natural resources, and… More Info Premium Content By Haley Zaremba – Aug 01, 2026, 12:00 PM CDT Finland's Pornainen, population 5,000, just switched on the world's largest sand battery, built by Polar Night Energy for district heating company Loviisan Lämpö. The battery can cover roughly a month of the town's summer heating demand or a week in winter, and has cut heating-related emissions…