NEM Overview: Wednesday 17 June 2026

NEM-wide renewable penetration sits at 43% as of the 06:30 AEST interval, with the grid stress score at 71.2 — the most significant market feature right now being a sharp price split between surplus and deficit regions. Victoria (−$0.10/MWh) and South Australia (−$2.00/MWh) are both printing negative prices as 3,560 MW of Victorian wind and 1,648 MW of SA wind flood those regions overnight, pushing supply well ahead of local demand (5,219 MW and 1,488 MW respectively). NSW and Queensland are running at $79.49/MWh and $78.73/MWh — a spread of roughly $80/MWh against SA — driven by winter heating demand (NSW at 8,272 MW, QLD at 6,764 MW) and thermal-heavy dispatch. Tasmania is settled at $25.89/MWh with hydro providing 888 MW and wind a further 275 MW against 1,142 MW of demand. The SWIS in WA is elevated at $250.16/MWh, a separate market but worth noting for participants with cross-market exposure.

Interconnector flows are doing the work of arbitraging that price split where limits allow. VIC1–NSW1 is exporting 780 MW northward at its export limit, while the NSW1–QLD1 link is constrained at −214 MW (QLD importing from NSW) and binding on its import limit. The V-SA link is flowing 270 MW from VIC into SA and is binding on its import limit, meaning SA cannot absorb any additional Victorian surplus — which explains the persistence of negative SA prices despite the interconnector running at capacity. The Basslink (T-V-MNSP1) is at zero flow this interval.

The most operationally relevant active notice is the YWPS4 non-conformance in VIC1 from 01:20–01:25 AEST this morning (−44 MW), a minor excursion at Yallourn that has since resolved. The ORABESS1 notices in NSW relate to the Orana battery storage unit non-conforming on 16 June and are no longer operationally active. The MT PASA reserve notice published 16 June identifies no Low Reserve Conditions across the NEM for the medium term, and the earlier SA LOR1 forecast for 17 June was cancelled — no reserve concerns are active heading into today. Carbon intensity reflects the regional price picture: SA is at 0.023 tCO2/MWh (95% renewable), TAS at zero, VIC at 0.520 tCO2/MWh (57% renewable), with NSW and QLD both above 0.67 tCO2/MWh at 21% and 18% renewable penetration respectively.

Today's outlook is shaped by the winter demand profile and wind conditions. Victoria's strong wind resource (24.6 km/h current, forecast wind potential of 13.6 through the day) is likely to keep VIC prices suppressed and maintain downward pressure on SA, with the V-SA interconnector expected to remain binding. NSW and QLD morning peaks will draw on black coal and gas peakers — QLD has 935 MW of OCGT and 476 MW of battery dispatched this interval — and prices in those regions are likely to firm further as heating demand peaks through the morning. Solar contribution across the NEM is negligible at this pre-dawn