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The original was posted on /r/upliftingnews by /u/Bitter-Lengthiness-2 on 2025-11-04 15:32:26+00:00.

Finland has successfully deployed the world’s largest sand battery as part of innovative renewable energy storage solutions that cut carbon emissions by nearly 70 percent.

The massive 15-meter-wide system in Pornainen can store enough thermal energy to meet the town’s heating needs for an entire month during summer.

The 100 megawatt-hour thermal energy storage system captures excess electricity from solar panels and wind turbines when production exceeds demand.

This industrial-scale solution from Finnish company Polar Night Energy now serves as the primary heat source for the town’s district heating network, warming homes, offices, schools, and public buildings.