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Finland Sand Battery Powers 5,000 Homes, Cuts Emissions 70%

7/25/2026

43 10 Full Breakdown

Summary

Story summary

Finland’s Pornainen town opened a sand battery that stores 100 MWh of heat and can heat 5,000 residents for a month in summer or a week in winter.
Polar Night Energy reports the battery cut emissions by almost 70 % and wood-chip use by 60 %.
CEO Tommi Eronen says it provides combustion-free heating for the year.
CCO Annette Höglund-Dönnes says cheap electricity heats the sand, which is used when power is costly.

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Story summary

Finland’s Pornainen town opened a sand battery that stores 100 MWh of heat and can heat 5,000 residents for a month in summer or a week in winter.
Polar Night Energy reports the battery cut emissions by almost 70 % and wood-chip use by 60 %.
CEO Tommi Eronen says it provides combustion-free heating for the year.
CCO Annette Höglund-Dönnes says cheap electricity heats the sand, which is used when power is costly.