Powerlink has recently published a 'Project Assessment Conclusions Report' to maintain reliability of supply in the Brisbane Metropolitan area.
The West Darra to Rocklea and South Pine to Upper Kedron transmission lines are 110kV double circuit lines that form part of the Greater Brisbane transmission network, with the South Pine and Rocklea Substations providing the high voltage injection points for the western part of the Greater Brisbane area.
Originally commissioned in 1963, the lines are nearing the end of their technical service lives, with the majority of structures exhibiting advanced corrosion, presenting an increased risk of mechanical failure, particularly in storm and severe wind conditions. The earth wires are also not sufficiently rated to cater for the continuing growth in fault levels over time.
The first step of the Regulatory Investment Test for Transmission (RIT-T) was the publication of the Project Specification Consultation Report (PSCR) in November 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 involved the two-staged refit of the transmission lines in 2020 and 2028, followed by a rebuild of the lines in 2043. There were no submissions received in response to the PSCR which closed on 19 February 2019.
The outcomes of the economic analysis contained in the PACR remain unchanged from those published in the PSCR. Consequently, the draft recommendation to refit selected components in two stages by December 2028 followed by a full rebuild of the lines by December 2043, has been adopted without change as the final recommendation in the PACR.
The RIT-T project involves the refit of selected components by December 2020 with an estimated capital cost of $4.55 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.