Powerlink has recently published a 'Project Specification Consultation Report' (PSCR) to address the secondary systems condition risks at Innisfail Substation.
Innisfail Substation is located approximately 70 kilometres south-east of Cairns in Far North Queensland. The site was originally established in the late 1950s as part of the Kareeya Hydro Power Station project to provide electricity to coastal communities in the area. It continues today as a 132/22kV bulk supply point for Energy Queensland's distribution network for the Innisfail area.
Planning studies have confirmed there is a long-term requirement to continue to supply the existing electricity services provided by Innisfail Substation. The secondary systems at Innisfail Substation broadly perform the functions of transmission element protection, data collection, remote (and local) control and monitoring. Many of the current systems were installed in 2003 and are reaching the end of their technical service lives, with respective manufacturers slowly withdrawing support and limited spares are available.
Increasing failure rates, along with the increased time to rectify the faults due to the obsolescence of the equipment significantly affects the availability, reliability and technical capability of these systems to continue to meet the requirements of the National Electricity Rules.
The proposed preferred option that is considered to satisfy the Regulatory Investment Test for Transmission involves the replacement of the secondary systems at Innisfail Substation in a new building by December 2024.
The indicative capital cost of this option is $11.63 million in 2020/21 prices.
Powerlink welcomes submissions from potential proponents who consider they may be able to offer a credible non-network option that is both economically and technically feasible to address the secondary systems condition risks identified in the PSCR.
Submissions are due by COB Friday, 5 March 2021.
Powerlink anticipates the publication of a Project Assessment Conclusions Report in May 2021 containing the final results of the economic assessment.
In the context of engagement activities with customers and the general community, Powerlink has assessed this project as 'minor' on the RIT-T stakeholder engagement matrix.
A copy of the Project Specification Consultation Report is available below.