Addressing the secondary system condition risks at Sumner

Market Network Service Provider, National Electricity Market
StageProject Assessment Conclusions Report
ConvenorAEMO NSP
Accepting submissions?Yes
Submissions close17/05/2024

Powerlink has published a Project Specification Consultation Report (PSCR) to address the secondary system condition risks at Sumner Substation.

Sumner Substation was established in 2006 as a 110 kilovolt (kV) switching station to meet the increasing demand in the western suburbs of Brisbane. Planning studies have confirmed there is a long-term requirement to continue to supply the existing electricity services provided by Sumner Substation.

The secondary systems at Sumner broadly perform the functions of transmission element protection, data collection, remote (and local) control and monitoring. The majority of Sumner’s secondary systems will reach the end of their technical service lives by June 2026, with only limited manufacturer support and spares available after this time. Over 80% of the 110kV secondary systems equipment is expected to reach an unsupportable level by June 2026.

The proposed preferred option that is considered to satisfy the Regulatory Investment Test for Transmission (RIT-T) is in-panel replacement of selected 110kV secondary systems equipment by December 2025. The indicative capital cost of the RIT-T project is $8.1 million in 2023/24 prices.

In accordance with the requirements of the Rules, a summary of the PSCR is made available on the AEMO website. A copy of the PSCR can be obtained from the Powerlink website on the RIT-T Consultations page or by emailing

Submissions on the PSCR are required by the closing date of Friday 17 May, 2024.
Any enquiries in the first instance should be directed to:

Sarah Gilmour
Manager Network and Alternate Solutions
Powerlink Queensland
PO Box 1193
Tel: (+617) 3860 2111

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