New substation to ‘double backup’ Melbourne’s power supply

Melbourne CBD substation power supply

Melbourne’s CBD will soon have doubly secure power, with a $250 million upgrade to its electricity infrastructure in the final stages of completion.

The Melbourne CBD Security of Supply project, to be rolled out by CitiPower, was conceived to ensure that if unexpected events such as extreme weather, fires, traffic accidents or infrastructure failures occur on Melbourne’s major supply lines, then the network has a ‘double backup’ to provide continuous supply to homes and businesses in the CBD.

At the heart of the Security of Supply project is the Waratah Place Zone Substation, which has been rebuilt and is currently being connected to the CBD grid. Once completed, the zone substation will allow power to be diverted around the grid so the duration of a major power outage is limited to no more than 30 minutes.

At the moment, the CBD’s power supply can withstand one major fault on the 66kV network. This project is designed to ensure the city can withstand two major outages, with minimal impact to customers.

While ensuring reliability, the Waratah Place Zone Substation has also been designed to help reinvigorate the heritage of the vibrant laneway culture around Chinatown and is set to feature an innovative and illuminating light display on its façade.

The new Waratah Place Zone Substation has been designed to retain the character of the original building down to the circular portal windows on the northern wall, while innovative light displays on the façade are destined to become a feature of the Chinatown landscape.

To connect the zone substation to the surrounding area, CitiPower will soon be digging a 4m-deep trench in a narrow laneway, replacing and connecting 10.5km of cables that wind throughout the city.

This complex construction involves working with gas, water and sewerage utilities to facilitate multiple asset relocations and marks the project’s final stages.

The deep excavations close to heritage-listed buildings, as well as beneath Little Bourke Street’s Chinese monument, have required extensive engineering to minimise the risk to these structures which were built on shallow foundations.

The Melbourne CBD Security of Supply project has also involved upgrades to the Brunswick Terminal Station, Bouverie–Queen Zone Substation and Victoria Market Zone Substation, and the installation of 21km of new electricity cables travelling over 7km from the Brunswick Terminal Station to Carlton.

CitiPower Chief Executive Officer, Tim Rourke, said the project was one of the most complex and important electrical upgrades the Melbourne CBD had ever seen.

“CitiPower is Australia’s most reliable electricity distribution network so it’s not necessarily the risk of outages we’re preparing for; it’s the impact of how long it takes to restore power,” Mr Rourke said.

“Every day, almost 1 million people and businesses — generating 25 per cent of the state’s economic value — depend upon the continuity of electricity supplies to the Melbourne CBD.

“There have been many cases where major cities around the world have been severely impacted by power outages ranging from a number of hours to a number of days. We are investing in our networks to do everything we can to prevent this from happening in Australia’s most vibrant and rapidly growing city.”

The Australian Energy Regulator rates CitiPower reliability at more than 99.99 per cent. This equates to customers being without power for an average of 20 of the 525,000 minutes in a year.

The Melbourne CBD Security of Supply project is due to be completed in 2020.

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