Carbon neutrality in energy production guides the use of renewable forms of energy, such as wind and solar power. The challenge of renewable energy sources is the variability of production according to seasons and even days and hours. Energy production and consumption must be in balance all the time, and in connection with this, the need for energy storage increases as the use of renewable energy sources increases. With the timely storage/discharge of energy, significant savings can be achieved in centralized energy production but also in private households through consumption flexibility, when energy can be stored e.g. to batteries, water and gas and soil.