The demonstration project will be launched in Niedersachsen, which has been actively introducing renewable energy, particularly large-scale wind power, in recent years. The project aims to build a large-scale hybrid battery system using lithium-ion batteries and NAS® batteries that can stabilize the distribution grid, and thereby control the electric power supply and demand balance, by charging and discharging storage batteries. Another aim is to establish a new business model for electricity trading using the battery system.