Interesting Engineering
Summary
Finland’s winter of 2025–2026 was brutal, unusually cold even by local standards, and electricity prices hit levels that laid bare just how volatile the Nordic market can be. Polar Night Energy’s own data shows Finnish spot prices swinging within a single week from 3 €/MWh to 373 €/MWh.
Beyond heat, Polar Night Energy is developing Sand to Power, a product line combining turbine technology with the sand battery to enable a Power-to-Heat-to-Power (P2H2P) cycle. A pilot is underway in Valkeakoski, targeting 30–35 percent electrical efficiency and combined heat-and-power efficiency approaching 90 percent. The pilot concludes in 2027, after which the company intends to move to commercial-scale deployment.
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