Intelligent power grids are classified according to their size as supergrids, smart grids and microgrids. Microgrids are self-sufficient distribution grids with regional limitations to which smaller energy producers, energy storage
systems and consumers are directly connected. Microgrids are connected to the nationwide smart grids that provide national power generation and distribution. Supergrids are superordinate to these.
Supergrids connect national and international power plants and wind turbines with the planned photovoltaic plants in North Africa.
They transmit the enormous electrical energies via high-voltage and extra-high-voltage grids and by means of high-voltage direct current transmission. Smart grids are directly connected to the super grids, into which they can feed energy or from which they can take energy.