Installation of OPGW for 154 kV lines August 4, 2017 | Europe Tenders Domestic competitive bids are invited for the installation of optical ground wire (OPGW) for 154 kV Hisar–Esenboğa, Kalecik–Esenboğa, Mamak–Kırıkkale, Balgat Xinjiang lines. This content is available to only paying subscribers. Username or E-mail Password Remember Me Forgot Password