Why DO WE NEED ENERGY STORAGE?
Currently, the supply and demand of electricity are kept in balance primarily by controllable fossil-fuel power plants. In the course of the energy transition, the entire energy demand is to be switched to renewable energy sources, thus drastically reducing greenhouse gas emissions. Enough renewable energy is available: on the area of Germany alone, as much solar energy falls annually as is consumed worldwide. However, unlike fossil fuel power plants, renewable sources are more unreliable, subject to external factors and seasonal and diurnal fluctuations.