NEM Overview: Thursday 20 August 2026

SA is the standout this morning, printing $101.02/MWh against total demand of just 1,454 MW, while WA sits highest of all NEM-adjacent regions at $104.68/MWh. NSW trades at $77.29/MWh (8,203 MW demand), QLD at $72.50/MWh (6,911 MW), VIC at $55.52/MWh (6,366 MW), and TAS the cheapest at $39.03/MWh on just 1,142 MW demand. The SA-VIC spread of roughly $45/MWh reflects SA's heavier reliance on gas peaking (OCGT and CCGT combined near 439 MW) against thin wind output of 423 MW, while VIC leans on 3,965 MW of brown coal and strong wind generation of 2,249 MW to keep prices contained.

NEM-wide renewable penetration sits at 44.9% per this morning's scoring, though the regional spread is wide: TAS is running 100% renewable on hydro and wind, SA at 56.1%, VIC at 37.4%, NSW at 24.0%, and QLD lowest at 19.2%. Coal remains the dominant NSW and QLD contributor — 5,286 MW black coal in NSW and 5,392 MW in QLD — with wind supplementing solidly in both regions (1,023 MW and 1,093 MW respectively). Solar contribution is negligible across the board in this pre-dawn window, with all regions reporting near-zero solar output; NSW cloud cover sits at 100% currently, capping today's solar ramp until skies clear later in the outlook.

Grid stress is elevated at 59.1 and price stability weak at 28.3, consistent with the SA voltage intervention still working through the system — AEMO issued a direction to AGL's Torrens Island units on 18 August to maintain voltage control in SA, with that direction's effects extending into today. Watch the V-SA and T-V-MNSP1 (Basslink) interconnectors, both currently binding at 170.8 MW and 206.0 MW flows respectively, and note Basslink's technical limitation constraint (I-VT_000) invoked since 18 August remains active. The NSW-QLD interconnector shows -468.6 MW flow (QLD importing from NSW) with no binding constraint, so cross-border arbitrage between those two regions stays open today.

Weather-wise, cloudy conditions across NSW, SA, and VIC will suppress solar ramps through midday, with SA and NSW forecasting improved solar potential from tomorrow (22 August) as cloud cover drops sharply. Wind potential is weak nationwide this morning (0.9–4.5 range across regions), suggesting today's renewable share will lean on hydro and existing wind capacity factor rather than fresh generation growth. No credible contingency events remain active — the VIC1 Eildon-Mt Beauty reclassification was cancelled overnight — but traders should monitor the SA voltage direction's expiry (nominally 1500 hrs 19 August, likely extended) for any change in dispatch behaviour from Torrens Island.