Regional Outlook — NSW1: Sunday 17 May 2026
The NSW spot price sits at $244.54/MWh at 06:30 AEST, with demand at 7,619 MW and rising sharply through the morning ramp. This is well above the overnight trough — prices ranged from $77–$135/MWh between roughly 22:30 and 02:30 AEST — and the current level reflects the typical autumn morning demand surge compounding with a notable network event. A power system notice confirms that Upper Tumut Units 1, 2, 3 and 4 tripped at 23:17 AEST, a non-credible contingency event that removed significant hydro capacity from the NSW dispatch stack at a sensitive time. AEMO did not instruct load shedding, but the loss of those units is a material factor in this morning's elevated price outcome.
The generation mix as at 05:55 AEST (the latest available interval) shows black coal supplying 5,627 MW, hydro contributing 1,083 MW, wind at 182 MW, solar at 42 MW, and battery output negligible at 0.06 MW. Gas OCGT and CCGT are both at zero. Renewables are contributing 18.85% of the generation mix — down markedly from the early-morning high of around 32.8% recorded near 17:55 AEST, when hydro flows were stronger and overnight wind output was higher. The current carbon intensity sits at 0.7141 tCO2/MWh, the highest point in the trailing 24-hour dataset, consistent with reduced hydro output following the Upper Tumut trip and minimal solar contribution under 93% cloud cover. Today's weather outlook for Sydney is fully overcast (100% cloud cover, max 18.6°C), so solar generation is expected to remain negligible throughout the day.
Predispatch forecasts for the 07:00–08:30 AEST window (21:00–22:30 UTC) show prices in the $265–$310/MWh range, with the 07:30 AEST half-hour interval attracting forecasts consistently at or above $295/MWh across multiple dispatch runs. The 08:00 AEST interval (22:00 UTC) is drawing forecasts of $300–$376/MWh across recent runs, reflecting strong morning demand, limited solar support, and the reduced hydro fleet. The 08:30 AEST interval forecasts are even more elevated, with several runs at $370–$410/MWh. Traders with flexible load should note this is the highest-risk pricing window of the morning. Grid stress is scored at 82.2 out of 100 in the current market conditions assessment, reinforcing the tightness in today's dispatch environment.
The active market notice of most direct relevance to NSW is the Upper Tumut contingency event (Market Notice 144110), which remains open with cause unknown. Murraylink also remains on a zero-flow constraint (I-ML_ZERO, Market Notice 144097) following an unplanned outage, limiting SA-VIC transfer capacity and indirectly tightening interconnector flows across the broader NEM. A Forecast LOR1 is active for QLD from 17:00–19:00 AEST today (Market Notice 144108, updated 144113), which may draw on any available NSW-QLD interconnector headroom during the afternoon peak. NSW engineers and trading desks should monitor the Upper Tumut