TransGrid has published a Project Assessment Conclusions Report (PACR) for reinforcing the NSW Southern Shared Network to increase transfer capacity to demand centres (HumeLink).
The PACR has been prepared as the final step in the HumeLink Regulatory Investment Test for Transmission (RIT-T) process and follows the Project Specification Consultation Report (PSCR) published in June 2019, and Project Assessment Draft Report (PADR) published in January 2020.
The PACR finds that Option 3C, comprised of new 500 kV lines in an electrical ‘loop’ between Maragle, Wagga Wagga and Bannaby, provides the greatest net benefits of all options considered, across all scenarios investigated.
Option 3C is assessed to be the preferred option identified under this RIT-T and is found to have approximately 23 per cent greater estimated net benefits than the second ranked option (Option 2C), on a weighted basis across the scenarios investigated.
The analysis shows that the preferred option is expected to:
- deliver net benefits of approximately $491 million over the assessment period, in present value terms;
- reduce the need for new dispatchable generation investment to meet demand going forward;
- avoid capital costs that would otherwise be required associated with enabling greater integration of renewables in the National Electricity Market (NEM);
- lower the aggregate generator fuel costs required to meet demand in the NEM going forward; and
- provide significant ‘competition benefits’ by increasing the efficiency of bidding in the wholesale market.
The preferred option identified over the course of this RIT-T is consistent with the network topology and operating capacity of HumeLink in the final AEMO 2020 Integrated System Plan (ISP).