The purpose of this action is to modernise the V423 lines in order to increase the reliability, security and efficiency of the transmission system operation. The route of the upgraded 400 kV V423 line runs along the current V423 line. The length of the line is 25.28 km. During the modernisation, the V423 line will be replaced in the section TR SOK — st. no.844. The transmission capability will be increased to 2500 A at the maximum operating temperature of the conductors 80 °C.