Polar Night 2024
Giant 'sand battery' holds a week's heat for a whole town New Atlas
Goodbye sun: What it's like to experience the polar night along Norway's rugged coastline Space.com
'A Woman in the Polar Night' Review: The Ritters in the Arctic The Wall Street Journal
Loviisan Lämpö Invests in Polar Night Energy's Sand Battery in Pornainen – Towards Non-Combustion Heat Production AltEnergyMag