The system will provide district heating to the city of Kankaanpää in western Finland. It has 100 kW of heating power and 8 MWh of energy capacity.Finnish utility Vatajankoski and Finland-based startup
A team of Finnish engineers has installed the world’s first commercial "sand battery," and it could help overcome a vexing obstacle to widescale implementation.
Polar Night Energy says it's developed and commercialized a super-cheap, super-simple way of storing energy for anywhere between hours and months, simply using heated sand. Its first 8-megawatt-hour thermal battery has gone online in Finland.
Energy storage is essential for the efficient use of renewable energy like wind and solar. Both depend on weather and the time of the day to generate ele.