Milperra Zone Substation Upgrade

The Milperra zone substation has been providing power to the community since 1966. This group of switchgears requires replacement as it’s nearing the end of its serviceable life to maintain a reliable electricity supply into the future. The upgrade will greatly improve our capability to meet the existing and future electricity needs of homes and businesses in the area and will help to reduce the occurrence of electrical supply outages.

The electrical switchgear which will require replacement will be successfully replaced in three stages.

October 2024 - Late 2025 (Stage 1)

• This stage will involve construction of the switchroom building.
• After some minor enabling works are completed, excavation will be required for the new cable basement.
• This will be followed by peering and the formation of the new concrete slab for the building.
• The walls and roof of the building will then be constructed, followed with building fit out works.
• External works will then be completed, with upgrades to the driveway and fencing.

 

Late 2025 to Late 2027 (Stage 2)

• This stage will first involve the equipping of the new switchroom with the replacement 11,000V switchgear.
• After the new switchgear is installed, electrical load will be transferred across from the old to the new switchgear.
• New 11kV cables will be installed to enable the electrical load transfers.

 

Late 2027 to Late 2028 (Stage 3)

• This stage will involve the decommissioning of the existing compound filled switchgear inside the existing switchroom.
• The equipment will be deenergized, made safe, removed from site and recycled.

Council notification:
Ausgrid consulted with the City of Canterbury-Bankstown Council regarding the proposed upgrade of this substation, who have no objections to the proposed works.

Environmental assessment:
Minimising the impact our works have on the environment is of paramount importance to Ausgrid. These proposed works will be assessed under Part 5 of the Environmental Planning and Assessment Act 1979 and every effort will be made to minimise disruption to the community.

Ausgrid will be completing a Summary Environmental Report (SER) and is the determining authority for these works. Multiple assessments will be undertaken during the development of this report and mitigation measures will be implemented as appropriate to minimise impacts on surrounding residents as much as possible. At the completion of works, the ground surface and surrounds will be reinstated

• Site investigations within and around the substation.
• Excavation works inside the zone substation to form a new cable basement.
• Construction of a switchroom building extension within the zone substation.
• Excavation and cable jointing works on the perimeter of the substation near Marigold Street to connect the new cables to the existing cables.
• The following equipment is anticipated to be used for the excavation and construction works: piling rig, excavators, jack hammers, trucks, front end loaders, mobile crane.
• Like any construction site, noise and dust may be generated and we will work to minimise these impacts and finish the work as quickly as possible.

 

The planned work will not disrupt your power supply.

Construction hours would be between 7.00am and 6.00pm, Monday to Friday, and 8.00am and 1.00pm on Saturdays, unless otherwise advised. Please note that Ausgrid will liaise with adjoining land occupiers well in advance of any work commencing.

Equipping works inside the substation would follow however will be primarily undertaken within the new building.