The electricity transmission system is an essential structure for ensuring a safe and reliable supply of energy to end-users. Given the increase in energy demand, the change in the structure of generation sources, the emergence of new areas with significant electricity needs, and the need to increase the level of interconnection in the European energy system, it is necessary to analyze a structure adapted to the new conditions of electricity transport networks in Romania. The development of renewable energy sources with weather-dependent production requires the development of adequate management of backup sources, electricity storage systems, and FACTS systems to ensure the necessary quality of electricity supplied to users. The functioning of the electric power system in Romania within the European system with the analysis of the specific problems of interconnection both energetically and commercially.