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Two Finnish companies, Vatajankoski and Polar Night Energy, recently built and started operating an energy storage system in which recovered electricity is converted to heat and stored in sand. The battery, which has 100kW of heating power and 8MWh of storage capacity, will supply heat to the district heating network of the town of Kankaanpää (home to around 11,000 people), in south-west Finland. This world first could inspire other similar systems around the world and accelerate the transition to renewable energy in a more efficient way.


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