Structure of the power gridSecurity of supply
The security of supply is one of the key aspects of the European electricity grid. It is a measure of how well the required electrical energy can be retrieved at any time. This is just as important for private users as it is for energy-intensive industries. To ensure the security of supply requires on the one hand that enough reserve power is always available and on the other hand that the power grid is able to compensate for the failure of operating resources such as transmission lines or transformers. If this is the case, the grid meets the important "n-1 criterion". In Germany, the transmission system operators must ensure the security of supply.