TransGrid PSCR: Meeting demand growth in the Greater Macarthur area

Market Network Service Provider
StageProject Specification Consultation Report
ConvenorAEMO NSP
Accepting submissions?No
Submissions close31/08/2020

TransGrid has recently published a Project Specification Consultation Report (PSCR) for meeting demand growth in the Greater Macarthur area. 

This PSCR has been prepared in conjunction with Endeavour Energy (as the relevant distribution network service provider).  The Endeavour Energy 66 kV network in the Greater Macarthur area is currently supplied by:

  • one 250 MVA 330/66 kV transformer at TransGrid’s Macarthur substation 
  • two 120 MVA 132/66 kV transformers at Endeavour Energy’s Nepean substation 

A single 375 MVA 330/132 kV transformer at TransGrid’s Macarthur substation also provides 132 kV supply to Endeavour Energy’s Nepean substation via the tail-ended high capacity 9L1 Macarthur to Nepean 132 kV circuit. 

In addition, the normally open 9L4/93X and 9L5/93Y 132 kV circuits provide a limited level of backup to Nepean at 132 kV from Sydney West and Liverpool. The level of backup available from these feeders is progressively being reduced as load growth in the South West Priority Growth Area materialises.

Endeavour Energy has experienced unprecedented growth in new customer connections in the last five years driven by the growth in the greenfield housing market. Continued growth in demand within the Greater Macarthur area is forecast to result in network constraints that, if unaddressed, will result in significant involuntary load shedding to end consumers. 

Having considered whether a number of credible options would meet the identified need, TransGrid considers that there are two feasible network option from a technological and project delivery perspective. 

Option 1 has been identified as the preferred option for addressing the identified need in this PSCR. Option 1 involves the installation of a second 330/66 kV transformer at the Macarthur substation. This option is estimated to have a capital cost of $8.88 million +/- 25% and is expected to be commissioned by June 2022. 

TransGrid welcomes written submissions on materials contained in this PSCR. Submissions are particularly sought on the credible options presented and from potential proponents of non-network options. Proponents are encouraged to make submissions on any non-network option they believe can address, or contribute to addressing, the identified need, and that could meet the technical requirements set out in this PSCR. TransGrid encourages proponents to reach out and make contact as soon as practicable about potential solutions, ahead of preparing a formal submission. Submissions are due on 31 August 2020.

In accordance with the requirements of the National Electricity Rules, a summary of the PSCR is made available on the AEMO website. A copy of the PSCR can be obtained from TransGrid’s website on the Regulatory Investment Tests page or by emailing

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