TransGrid PSCR: Managing safety and environmental risks on Line 17 (Avon - Macarthur)

Market Network Service Provider
StageProject Specification Consultation Report
ConvenorAEMO NSP
Accepting submissions?No
Submissions close12/10/2020

TransGrid has recently published a Project Specification Consultation Report (PSCR) for managing safety and environmental risks on Line 17 (Avon – Macarthur). 

Constructed in 1964, the 41 km single circuit 330 kV transmission line is comprised of 101 steel tower structures between Avon switching station and Macarthur 330 kV substation. Line 17 forms a key link between the Wollongong region and the Sydney metropolitan area. 
Condition issues that will impact the safe and reliable operation of the network have been found on Line 17. The condition issues raise a number of risks associated with asset failure, including safety and environmental (bushfire) risks. Investment to address the deterioration of the assets along Line 17 due to corrosion is needed to mitigate risks to safety and the environment.

TransGrid manages and mitigates bushfire and safety risks to ensure they are below tolerance levels or ‘As Low As Reasonably Practicable’ (‘ALARP’), in accordance with TransGrid’s obligations under the New South Wales Electricity Supply (Safety and Network Management) Regulation 2014 and TransGrid’s Electricity Network Safety Management System (ENSMS). The proposed investment will enable TransGrid to continue to manage and operate this part of the network to a safety and risk mitigation level of ALARP. Consequently, it is considered a reliability corrective action under the RIT-T.

In the PSCR TransGrid presented one credible network option that would meet the identified need from a technical, commercial, and project delivery perspective. Two other options to address the need were considered but were not progressed due to technical and commercial feasibility. The optimal commercially and technically feasible option presented in this PSCR – Option 1 (line refurbishment) – is the preferred option to meet the identified need. 

The estimated capital cost of this option is approximately $6.6 million +/- 25 per cent. TransGrid is the proponent of the proposed network project.

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 that could meet the technical requirements set out in this PSCR. Submissions are due on 12 October 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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