Geez megan you are going back a bit now. I also worked at BHP and while you are correct,that was until the steel rolling mills were built in the early 60s. ETSA power was then required as the blast furnace powerhouse could no longer supply all of the plant and the town. I remember the towers being built from pt Augusta well. A second line was added later and I think extended at that time all the way down to pt Lincoln which had a diesel run powerhouse for its supplies and then got decommissioned as it was too expensive to run with the oil shocks of the 70s. Memory is getting faded so may be a little out. I am assuming BHP or Arrium as it is now called decommissioned its powerhouse in later years going on there concerns of no power with this outage.