From council sustainability committee meeting 30 May 2023:
Electric Vehicles
Proposed Tesla recharging station, park and ride site, requires power upgrade, hope to have operational next financial year.
Power upgrade here is not very specific. It could just mean needing a new high voltage kiosk substation installed, which almost all new supercharger sites of any real capacity will require. But it could also mean some larger infrastructure upgrades are required.
If we look at essential energy's network maps of the proposed site:
There is a modest 500kVA pole transformer feeding an already large number of premises. This transformer is feed from the Yass 22kV line. For a v3 supercharge 3 cabinet install, most other sites have utilized 4 cabinets, would require at least a 1MVA transformer. Adding a new kiosk substation is typical of this size new supercharger install.
If we this follow this 22kV line back to the Yass Zone Substation,
And note that this Zone substation is feed by a 66kV line from the major regional Transgrid substation via here,
The Yass Transgrid and Yass Zone substations are shown via line diagrams here from Essential Energies asset report,
If we then look at the maximum load data from the same asset report,
The 22kV line from Yass Zone substation to Yass Tesla Supercharger site is projected to be at 15.2/16.8 MVA which would mean you might just squeeze another 1-1.5 MVA transformer into the area.
But if we look at the Regional Yass Transgrid link the the Yass Zone substation we see that it is oversubscribed in summer, 15.5/12 MVA and with a little winter capacity, 16.8/18 MVA.
I don't know if this is then indicating that the upgrade(s) required might including upgrading the main Yass Zone Substation 66kV feeder from the Transgrid Substation.
Measuring this out,
Would seem to indicate around a 3.5km 66kV line upgrade.
So this may be what is holding up any movement on the Yass supercharger.
References:
Network maps
ArcGIS Web Application
Distribution Assets annual report
https://www.essentialenergy.com.au/...es/Our-Network/DAPR-Essential-Energy-2021.pdf