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World’s First Large-Scale ‘Sand Battery’ Goes Online in Finland

6th July 2022

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Polar Night Energy’s system, based on its patented technology, has gone online on the site of a power plant operated by utility Vatajankoski.

The 4×7 metre steel container contains hundreds of tonnes of sand which can be heated to a temperature of 500-600 degrees Celsius. The sand is heated with renewable electricity and stored for use in the local district heating system.

It has a particularly strong use case in Finland which sees long and very cold winters, and was recently cut off from Russian gas supplies over a payments dispute. The storage system’s developers say it is cheap and easy to build.

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