Power: West Gate Tunnel 220kV Relocation Works
West Melbourne, Victoria
AusNet Services
March 2019
November 2019
Contract Type:
Construct Only
Power: West Gate Tunnel

The Victorian Government has partnered with Transurban to deliver the West Gate Tunnel Project, which will give Melbourne a second freeway link between the west and the city. Awarded to construction contractors CPB Contractors and John Holland (CPBJH JV), works include an upgrade of the West Gate Freeway and the construction of a new road and tunnel connecting the West Gate Freeway with the Port of Melbourne, CityLink and the CBD. The project will be built over five years, opening in 2022 to provide a vital alternative to the West Gate Bridge, quicker and safer journeys and remove thousands of trucks from residential streets.

As part of the construction works to widen the current freeway from 8 to 12 lanes, Zinfra were engaged by CPBJH JV to undertake major power utility relocation works on the AusNet 220kV transmission line assets. The contract includes lattice tower decommissioning, to be replaced with a combination of 6 monopoles and 2 new lattice towers, and reconductoring of the lines. A critical component of delivery includes the substantial freeway crossing of the West Gate Freeway with a line span reaching approximately 325 metres over existing traffic lanes, with the freeway kept operational during peak periods. The 220kV line will then feed into AusNet’s Brooklyn Terminal Station (BLTS).

These works form a part of Australia’s critical national power infrastructure; the Western Metro Ring Transmission Grid. All works undertaken on these high voltage transmission lines are undertaken with the permission of AusNet Services who own and operate this network. To ensure these works are undertaken by the appropriate expertise, and works are consistent across the nation, the scope of work and timing is determined via significant consultation with AusNet Services. Permits are then issued for work to take place during specific periods of lower demand during the year.

Works to install the two monopoles along the north side of the West Gate Freeway are now complete. The much slimmer structures carry the 220 kV power lines and take up a much smaller footprint than the traditional lattice towers, that are being decommissioned. These new poles reach a height of 58 metres when fully assembled and are considered some of the largest constructed poles in AusNet Services’ network. Further works to complete the remaining monopoles and lattice structures is still underway, with completion set for November 2019.

Peter Iancov, Zinfra’s MD, highlights "This contract award reaffirms Zinfra’s market leading transmission capability and experience, including highly complex brownfield environments. It also demonstrates our ability to engage in collaborative client relationships to meet current market demands, while mobilising a large team of highly skilled transmission linesmen to meet project needs"