Transgrid has published the Project Specification Consultation Report (PSCR) for managing risk on Line 94M (Beryl – Crudine Ridge). Publication of this PSCR represents the first step in the Regulatory Test for Transmission (RIT-T) process.
Line 94M is a 132kV transmission line between Beryl substation and Crudine Ridge Wind Farm. The line is part of the original line built between Mt Piper and Beryl substations in 1976, which was broken up when Crudine Ridge was connected to the grid in 2020. The line has a route length of 70 km strung over 264 structures.
Detailed analysis of asset condition information indicates that the line has several condition issues which require refurbishment to address its health and maintain appropriate risk levels across the network. The most significant element of concern is the condition of the wood pole structures on the line. Line 94M was first placed into service in 1976, and the wood poles are approaching 50 years of age and toward the end of their nominal lives.
If action is not taken, the condition of Line 94M is expected to expose us and our customers to increasing levels of risk going forward, as the likelihood of failure increases. There are safety and bushfire risks under the ‘do nothing’ base case, as well as higher expected costs associated with reactive maintenance that may be required under emergency conditions (‘financial risks’). The proposed investment will enable us to manage safety, environmental, and financial risks on Line 94M.
Three credible network options have been identified that meet the underlying need from a technical, commercial, and project delivery perspective. Option 1 involves the replacement of 29 wood pole structures known to be exhibiting deterioration, associated insulators and fittings, and remediating priority condition issues, and has a capital cost of $9.31 million ($2024-25). Option 2 involves rebuilding the entire line and has a capital cost of $46.05 million ($2024-25). Option 3 involves rebuilding the entire line and replacing existing Panther conductors with Lemon ACSR/GZ and has capital costs of $59.44 million. Option 1 has been identified as the preferred option that maximises net benefits to participants in the National Electricity Market (NEM).
Transgrid welcomes written submissions on materials contained in this PSCR. Submissions are due on 22 August 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.