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The pilot plant developed by Polar Night Energy has been operating since 2022 , and now they want to launch an industrial (10 times larger) “sand battery” in Finland for use during cold polar nights.
New Atlas describes the design as a large steel bunker filled with sand (or similar solid material) that is heated through a heat exchanger embedded in the center, using excess electricity from the grid – such as that generated during a surge in renewable sources.
This energy can be stored for months with very little loss until it is used when needed. In Finland, the new sand battery will be tested in the district heating system of the Finnish municipality of Pornainen, managed by Loviisan Lämpö.
The sand battery is expected to be 13 meters high and 15 meters wide, and will have a power of 1 MW and a capacity of up to 100 MWh – which the company says is equal to Pornainen's weekly heating needs in winter or a month's in summer. For comparison, the previous Polar Night sand battery measures 4 x 7 meters with a rated power of 100 kW and a capacity of 8 MWh.
The new battery should also reduce carbon dioxide emissions from the district heating system by 160 tons per year – almost 70%. The sand itself will also be sustainably sourced – it will consist of ground soapstone, which is a by-product of another local industry.
Polar Night Energy says construction and testing of the new sand battery will be completed in about 13 months.
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