Annette Höglund-Dönnes

Chief Commercial Officer, Polar Night Energy

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Finnish sand batteries store renewable energy as heat for district heating

Overseeing commercial deployment of sand batteries

A Finnish startup stores surplus wind and solar power as heat in giant sand silos, then releases it to warm homes through district heating networks. Polar Night Energy's second commercial sand battery, under construction in Vääksy, will hold 250 megawatt-hours of thermal energy when it starts operating in spring 2027.

Updated 1 hour ago