The Queensland to NSW Interconnector (QNI) comprises double circuit 330 kV and 275 kV transmission lines from Armidale in NSW to Tarong in Queensland.
The transfer capacity of QNI is constrained on occasions for both northwards and southward flows, and the number of hours of constraint in both directions is increasing. Currently, the transfer capability across QNI is limited by voltage, transient stability and oscillatory stability. The thermal ratings across the majority of the elements of the interconnector are significantly higher than the stability limits.
TransGrid and Powerlink have conducted joint planning investigations about if and when an upgrade to the Queensland/New South Wales Interconnector (QNI) would be economically justified under the AER’s Regulatory Investment Test for Transmission (RIT-T) and commenced the regulatory consultation process in June 2012 with the publication of a Project Specification Consultation Report (PSCR), followed by a Project Assessment Draft Report (PADR) in March 2014. A Project Assessment Conclusions Report (PACR), the final stage of the three part RIT-T process, has recently been published.
Overall, the outcome of the RIT-T cost-benefit analysis contained in the PACR identified that the selection of a preferred credible option is critically dependent on the weights assigned to the reasonable scenarios and assumptions made. The analysis also identified that certain key scenario parameters affected the ranking of options and magnitude of market benefits. Considering the level of uncertainty surrounding these scenario parameters, the PACR contains a final recommendation to ‘do nothing’ in relation to an upgrade of QNI as the proposed preferred option.
In accordance with the requirements of the Rules, a summary of the PACR will be placed on AEMO’s website. A copy of the PACR together with a copy of the PSCR, PADR, formal submissions received and reports from previous investigations can be downloaded in the following link.
|Summary of Project Assessment Conclusions Report Development of the Queensland - NSW Interconnector
13 November 2014 | filesize:130 KB (.pdf)