Transmisora Eléctrica del Sur 3

Transmisora Eléctrica del Sur 3 S.A.C is the concessionary company, since 2016, for the design, construction, operation and maintenance of the 220 kV Montalvo-Los Héroes transmission line, as well as the expansion of the Montalvo (Moquegua) and Los Héroes (Tacna) substations. This line consists of 129 km of circuits and is planned to go into commercial operation in 2019.

It runs from the Montalvo substation to the Los Héroes substation at an altitude of 650 to 1,450 m.a.s.l., crossing the departments of Moquegua and Tacna.



  • Montalvo 220 kV substation (expansion): It consists of the installation of a 220 kV cell and the expansion of the busbar system, maintaining the substation design.
  • Los Héroes 220 kV substation (expansion): This will be installed partially in the area of the substation, on the side of the existing installations owned by REDESUR, because the available space is not sufficient for the configuration required by the project (migrate to double busbar with transfer disconnector).