Utility
Appears in 1 story · Last updated Oct 22, 2026
Operates the Pornainen sand battery
Polar Night Energy is building its third commercial sand battery in Vääksy, Finland: a 2-megawatt unit that will hold 250 megawatt-hours of heat. The company targets completion in summer 2027, when the plant will feed Lahti Energia's district heating network.
Updated Oct 22
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