Powerlink has recently published a Project Assessment Conclusions Report (PACR) to address the secondary systems condition risks at Tarong Substation.
Located approximately 130km north-west of Brisbane, Tarong Substation is a major part of the 275kV transmission backbone connecting generators to the major load centres in the south-east of the State. It also provides the major injection point for local, rural and bulk mining loads in south-west Queensland.
Several 275kV secondary systems at the Tarong Substation are reaching the end of their technical service life and are no longer supported by the manufacturer, with no spares available.
The first step of the Regulatory Investment Test for Transmission (RIT-T) was the publication of the Project Specification Consultation Report (PSCR) in September 2018 which invited submissions particularly on the credible options which could address the identified need.
The proposed preferred option identified in the PSCR considered to satisfy the RIT-T involves replacing selected secondary systems in the free space of the existing building by December 2022. There were no submissions received in response to the PSCR which closed in November 2018. As a result, no additional credible options have been identified as part of this RIT-T consultation.
The outcomes of the economic analysis contained in the PACR remain unchanged from those published in the PSCR. Consequently, the draft recommendation to replace selected secondary systems in the free space of the existing building by December 2022 has been adopted without change as the final recommendation in the PACR.
The estimated capital cost is $7.8 million in 2017/18 prices. Powerlink is the proponent of this project.
In the context of engagement activities with consumers and the general community, Powerlink has assessed this project as 'minor' on the RIT-T Stakeholder Engagement Matrix.
A copy of the Project Assessment Conclusions Report is available below.