Connecting Archer Zone Substation to Palmerston Zone Substation - Construction and commissioning of the new 66kV transmission line connecting Archer Zone Substation to Palmerston Zone Substation was completed in November 2018. The new transmission line was constructed to increase the capacity, security and flexibility of the electricity transmission and distribution networks servicing the growing Palmerston and rural areas.
Replacing the 66kV outdoor switchyard at Casuarina Zone Substation involved the installation of indoor 66kV Gas Insulated Switchgear (GIS) in a new building and three new 20/27MVA 66/11kV transformers to replace the outdoor 66kV switchgear and transformers. Construction commenced in October 2015 with commissioning completed in 2017.
Elizabeth River Transmission Line Crossing - To improve security of the Darwin/Katherine electricity supply transmission line six towers at the Elizabeth River crossing were replaced with towers rated to withstand a category 4 cyclone event. The 132kV electrical cables connected to the towers crossing the river were also replaced. Project civil works commenced in May 2016 and three of the six towers were constructed by 31 August 2016. Works ceased over the 2016/2017 wet season and recommenced in 2017 with the project completed in November 2017. Elizabeth River was closed intermittently while the high voltage cables were replaced.
Construction of Leanyer Zone Substationin Darwin’s northern suburbs is complete. Installation of electrical equipment commenced in early 2014. Works to connect the substation to the electricity network took from 26 September to 2 October 2015. The substation was fully operational in the first half of 2016.