Powerlink has recently published a 'Project Assessment Conclusions Report' (PACR) to address the secondary systems condition risks at Woree Substation.
Located 6km south of the Cairns Central Business District, Woree Substation is the major 132kV injection point into the Ergon Energy distribution network for Cairns. It also forms part of the far-north zone transmission network, with direct connection to Chalumbin Substation. As part of its configuration and function, the substation contains a Static Var Compensator (SVC), which helps improve the transfer of electricity across the network by reducing transmission losses, smoothing voltage fluctuations and stabilising power flows.
The secondary systems associated with the SVC and most of the standard substation 132kV and 275kV secondary systems at Woree Substation are reaching the end of their technical service lives, and are no longer supported by the manufacturer, with few spares available.
The first step of this RIT-T was the publication of a 'Project Specification Consultation Report' (PSCR) in October 2018, followed by the publication of a PSCR as amended by Addendum in December 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 the full replacement of the SVC secondary systems and the replacement of selected substation secondary systems by December 2022. There were no submissions received in response to the PSCR, which closed in March 2019. As a result, no additional credible options that could deliver a material market benefit have been identified.
The outcomes of the economic analysis contained in the PACR remain unchanged from those published in the December 2018 PSCR. Consequently, the draft recommendation of full replacement of the SVC secondary systems and the replacement of selected substation secondary systems by December 2022 has been adopted without change as the final recommendation in the PACR.
The estimated capital cost is $11.29 million in 2018/19 prices. Powerlink is the proponent of the proposed network 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.
A copy of the Addendum and the amended Project Specification Consultation Report is also available below.