Models of development for the electroenergetic system of Moldova by building new high voltage lines 220,330,400 kV are elaborated. It is advisable to construct these lines for strengthening linkages with the energy systems of Moldova, Ukraine and Romania. There are performed calculations of modes of electric power systems of Ukraine, Moldova and Romania (partially) provided synchronized operation of them. The values of power flows along transmission lines in Ukraine and Romania are determined. There are stated main principles of organization of common operation of electric power systems of Moldova, Ukraine and Romania.