This papers presents the possibility effects of application in real-time an advanced method for fast and sufficiently accurate definition of generator voltages to realize the favorable voltage-reactive states of electric power interconnection. The application in real-time will be realized by use the results of state estimation, which is the part of the new SCADA/EMS system in NDC Elektromreža Srbije. The special part of method developed is the possibility to make the direct connection between the values of generator voltages and voltage-reactive states on interconnected lines. The verification of method proposed is made, on the examples of perspective states of Serbian transmission network, in own wide environment. .