Why do we need the Powering Sydney's Future project?
The inner Sydney network supplies electricity to more than 500,000 customers in Australia's biggest city. Parts of the network are over 50 years old and are approaching the end of their serviceable life. Powering Sydney's Future is TransGrid's response to this ageing network and increasing electricity demand in a growing Sydney. A reliable electricity network is essential to support growth, and we are working towards a solution to ensure inner Sydney's needs are met now and into the future. TransGrid's plans include a network and non-network solution.
The non-network solution allows TransGrid to defer the network solution.
However, network changes are still needed by 2022 to ensure that
inner Sydney continues to enjoy reliable power into the future.
We are proposing to construct a new 330kV underground cable circuit between our substations at Potts Hill and Alexandria. To avoid future disruption we are proposing to install additional infrastructure to allow for a second cable circuit at a later stage. Our substations at Potts Hill, Alexandria and Picnic Point will also need upgrades to allow for the new connection.
What is the Potts Hill to Alexandria transmission cable project?
Powering Sydney’s Future is about securing a reliable, safe and economical electricity supply to inner Sydney. This project will deliver a crucial transmission cable circuit between our substations in Potts Hill and Alexandria, and provide for a second circuit to meet future demand.
The preferred route for this project primarily follows local and main roads and is around 20km long (see route overview inside). The new cable circuit would mainly be installed underground with some cable bridges to cross rail lines and waterways. You can view a more detailed map online at https://transgrid.mysocialpinpoint.com.au/psf#/
How will the Powering Sydney's Future project be built?
For most of the alignment we would dig a trench about three metres wide, install conduits before burying them and temporarily restoring the area. To cross waterways and rail lines, we are proposing to build special cable bridges. We anticipate that each cable drum section will take up to eight weeks to install (most properties would be exposed to around two weeks of trenching activity).
Joint bay construction:
Joint bays are built by digging an underground bay, allowing the cables to be installed in sections. Joint bays are usually installed every 600 to 800 metres along the trench. Once the joint bays have been built, they would be accessed later to install the cables (cable pulling and cable jointing).
Once the joint bays are connected by conduit, sections of the transmission cable can be installed. This typically takes about two weeks, weather permitting.
Once the cables have been installed in the conduits, they are joined together inside the joint bays. This would typically be done soon after the cable pulling towards the end of construction. Cable jointing is completed inside a covered enclosure.
What are the next steps?
As we prepare the Environmental Impact Statement (EIS), we want to ensure you know about the project and have the opportunity to input into the process. TransGrid will be in touch with stakeholders as well as community members living or working along the preferred cable route during the development of the EIS. We will be seeking feedback and ensuring key issues are captured, considered and addressed.
We need your input
As we prepare the EIS, it’s important for us to work with businesses, residents and the community to identify the potential impacts and identify solutions that can work. We welcome your input so we can best understand how this project might affect the communities along the cable route. You can also visit our online feedback portal at https://transgrid.mysocialpinpoint.com.au/psf#/ to find out more and share your thoughts about the project.
Community Drop-in Sessions
In addition to regular updates, we will also be holding a number of community drop-in sessions, to discuss the project and how it could affect your local area. Our project team will be available to answer questions and receive feedback on the proposed cable route. Please access the 180529_TGR130_PSF_Postcard_REV5_web.pdf for upcoming dates and venue options. (Please also check your letterbox, local newspaper or online for additional upcoming dates).
How will Powering Sydney's Future benefit you? Click below to find out