Polar Night Energy

Polar Night Energy is a Finnish company offering the Sand Battery, an industrial-scale high-temperature thermal energy storage system. It charges using electricity from the grid or local renewables, heating sand in an insulated steel silo, and discharges heat as hot water, steam or hot air for district heating and industrial processes. The system can also take part in grid balancing and reserve markets. It targets energy utilities, district heating networks and process industries.

• Sand-based high-temperature thermal energy storage
• Charging from grid or local solar and wind electricity
• Heat output as hot water, steam or hot air (60–400 °C)
• Grid balancing and reserve market participation
• Applications in district heating and industrial processes