Polar Night Energy

Founded in 2018, Polar Night Energy is a private company headquartered in Tampere, Finland with approximately 51-200 employees specializing in Energy Storage.

Polar Night Energy is a Finnish energy technology company that designs and manufactures high-temperature thermal energy storage systems known as Sand Batteries. Founded in 2018 by Tommi Eronen and Markku Ylönen, the company develops innovative solutions to reduce combustion in energy production and accelerate the expansion of wind and solar energy. The Sand Battery is a large-scale, insulated steel silo filled with sand or similar materials that stores renewable energy as heat, enabling energy companies, industrial operators, and municipalities to achieve climate goals while reducing energy costs. The technology serves district heating networks, industrial process heat applications, and grid balancing markets across a temperature range of 60-400°C. The company has delivered operational systems and is expanding globally with ongoing R&D into Power-to-Heat-to-Power conversion capabilities.