A scalding hot ‘sand battery’ is now heating a small Finnish town
The new Polar Night Energy sand battery installed in Pornainen, a small municipality in southern Finland. (Image credit: Polar Night Energy) A small municipality in southern Finland recently installed the world’s largest “sand battery” to supply the town’s heating. The new sand battery, designed by Polar Night Energy, is effectively a giant sandpit encased in a roughly 100 by 40 foot (30 by 12 meter) steel container. The sand is heated using closed-loop heat transfer pipe...














