As the pioneer in manufacturing and construction of transmission line of high and extra high voltage in Indonesia, the Company produced its first transmission line with the capacity of 70 kV and 150 kV in 1981, and a double circuit tower with the capacity of 500 kV in 1984. Until 2010, the Company completed a number of turn-key project packages with capacities ranging from 70 kV to 500 kV for PT Perusahaan Listrik Negara (Persero). Moreover, the Company is the only company in Southeast Asia that has testing tower facility destruction test with the capacity up to 500 kV.