Finland Unveils World’s Largest Sand-Based Battery
Finland has recently made headlines by unveiling the world’s largest sand-based battery, a groundbreaking innovation in thermal energy storage systems. The battery, located in the small town of Pornainen, utilizes sand or crushed rock to store heat generated by electricity, typically from renewable sources. This stored heat can then be utilized to warm buildings, offering a cost-effective and environmentally friendly alternative to traditional heating methods.
The sand battery in Pornainen is filled with 2,000 metric tons of pulverized soapstone, a material that was discarded by a Finnish fireplace maker. Despite its humble origins, this crushed rock has the potential to significantly reduce the town’s carbon emissions and eliminate the need for costly oil used in the district heating network.
Operated by Polar Night, the battery can store 1,000 megawatt-hours of heat for extended periods, providing ample heating capacity during Finland’s cold winters. The system boasts an impressive efficiency rate, with only 10% to 15% heat loss during storage and recovery processes. Additionally, the battery is expected to reduce wood chip consumption by 60%, further contributing to sustainability efforts in Pornainen.
While the sand battery may not be as visually striking as traditional lithium-ion battery packs, its economic advantages and environmental benefits make it a promising solution for energy storage. Other companies, such as Sunamp, Electrified Thermal Solutions, and Fourth Power, are also exploring thermal battery technologies using innovative materials and designs.
Charged using electricity from the grid, Pornainen’s sand battery allows operators to draw power at the most cost-effective times, leveraging Finland’s predominantly renewable and nuclear energy sources. With electricity prices in Finland being among the lowest in Europe, the sand battery presents a compelling case for clean and affordable energy storage solutions.
While the exact cost of the project was not disclosed, the simplicity of the structure and the affordability of raw materials suggest that the sand battery offers a cost-effective alternative to lithium-ion batteries. With a smaller prototype costing around $25 per kilowatt-hour of storage, the new version is expected to be even more economical compared to traditional battery technologies.
