Innovation Origins
Summary
In the energy transition Polar Night Energy offers an innovative solution: sand batteries. These high temperature thermal energy storages use sand, a material that can hold its temperature for months, bridging the gap between summer’s surplus and winter’s demand. The process involves the use of insulated steel silos filled with sand and heat transfer pipes. Electricity, ideally clean and cheap, is used to charge the sand up to a maximum temperature of 600 degrees Celsius. The stored heat can be extracted by blowing cool air through the pipes, which heats up for use in various applications. A sand-based system can store several times the amount of energy compared to water tanks of a similar size. These systems can be used for industry or to heat homes through district heating systems.
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