Transgrid has published the Project Specification Consultation Report (PSCR) for Maintaining safe and reliable operation of Sydney East, Wagga 132 kV, and Dapto substations. Publication of this PSCR represents the first step in the Regulatory Test for Transmission (RIT-T) process.
Substation gantries are essential for the safe and reliable operation of the whole substation. The gantries at the Sydney East, Wagga 132 kV, and Dapto substations display evidence of corrosion, which, if unaddressed, may result in the failure of the steelwork, connection bolts, holding down bolts, or baseplates. The failure of the gantries may in-turn result in a loss of supply to end consumers, injury to staff and damage to other critical substation equipment. These events may also affect more than one system element at the same time, which would require significant time to rectify.
Condition assessments performed through our routine maintenance program has shown degradation in the condition of these gantries which will increase their risk of failure. Without intervention, other than ongoing business-as-usual maintenance, the assets are expected to deteriorate further and more rapidly. This will increase the risk of supply interruptions to our customers as well as safety, environmental and financial consequences.
In the PSCR Transgrid has presented one credible network options that would meet the identified need from a technical, commercial, and project delivery perspective. The optimal commercially and technically feasible option presented in this PSCR – Option 1 (Replace the gantries and remediate holding down bolts which have reached end of life) - is the preferred option to meet the identified need at this stage of the RIT-T.
Transgrid welcomes written submissions on materials contained in this PSCR. Submissions are due on 10 July 2025.
In accordance with the requirements of the Rules, a summary of the Project Specification Consultation Report is made available on the AEMO website. A copy of the PSCR can be obtained from Transgrid’s website or by emailing regulatory.consultation@transgrid.com.au