The world's first sand accumulator was launched in Finland.

It allows you to store solar and wind energy until winter, when the price and demand for heat rises. Green energy, based on the principle of operation of electric fireplaces, heats sand up to 500 °C in an accumulator. Then, with the help of a heat exchanger, it heats the air circulating inside the chamber. It is it that is used in winter to heat water in the central heating system. From there, heat is supplied to the buildings. Sand is stored in a giant bunker, its volume is 100 tons. The temperature in the storage can stay at +500 °C for several months.