By virtue of its design, the Czech Republic’s 400 kV and 220 kV network fully complies with the N-1 criterion. Stricter requirements apply to the connection of nuclear power stations. The full output of a nuclear power station has to be safely supplied to the network even in case of a simultaneous failure of two feeders from the power station’s substation.

Further development of the transmission system (TS) is planned in accordance with technical and strategic standards set in the rules for transmission system operation - Grid Code (Grid Code is available only in Czech, however, a short annotation of each part of the Grid Code is available in English).; the main investment projects are shown in the table below.

Investment projects currently under preparation are aimed at covering a sharp increase in demand in certain regions or improving the reliability and quality of supply. The projects also respond to changes in transit flows and requests for the connection of new centres of consumption or generation to the system.

The table gives the review of main investment projects for 2006-2013; these projects are also reflected on the transmission system map.