Oman invites bids for construction of 220 kV substation August 15, 2013 | Middle East & Africa News The state-run Oman Electricity Transmission Company Limited (OETCL) has invited bids for the construction of a 220/132/33 kV substation at the Salalah Free Zone (SFZ). This content is available to only paying subscribers. Username or E-mail Password Remember Me Forgot Password