At present, however, we can observe new alternative energy sources, which can be low-power sources, scattered throughout the distribution area. Some sources (e.g. small photovoltaic systems) are detached to the level of individual buildings; however, they can add their low power to the public power grid. There is therefore a need for a major reconfiguration of electricity networks, which are associated with the expansion of SG. Such structure causes problems with stable operation and synchronization of a common network. To prevent a network from a collapse due to a variety of sources, it is necessary to establish a network of highly sophisticated and efficient management, which enables control of the power grid up to the level of the individual sources. The efficiency of successful management of smart grids network, which consists of a large number of sources (hundreds), and several times larger number of supply points (hundreds thousands), is dependent on the type and quantity of the information sources and consumers of energy. This should help the deployment of SG, which should enable optimum use of all its resources. In addition, however, dispersed distribution of individual sources and intelligent management should also provide fast and effective solutions to critical conditions that occur during failures of the distribution network due to the failures of sources or damaged lines.
An important aspect, especially for the future, refers to returning to DC energy distribution and building the power stations for electric cars. A current trend is to build intelligent buildings, which should ensure ecological and economic operating parameters, high degree of automation of operational processes, including the development of so-called communal services.
SG thus represent for both current and future electricity networks a number of other operational and economic advantages. They enable a higher degree of automation of substations and transformers, which results in reduction of operating expenses.