Commodity Demand — SA1: Sunday 16 August 2026
South Australia demand sits at 1,438 MW at 06:25 AEST, with spot price at $51.78/MWh, tracking a well-defined evening shoulder pattern. The overnight trough saw demand collapse to 490-680 MW between 02:00-05:00 AEST, dragging prices deeply negative (down to -$19.85/MWh) as wind generation of 1,371 MW vastly exceeded underlying load. Demand then ramped hard through the morning, hitting a peak of 1,887 MW at 09:00 AEST, which pushed prices to today's high of $92.40/MWh at 07:25 AEST as the system absorbed the rapid load pickup ahead of wind easing off its overnight highs.
The price-demand relationship today is unusually sharp for SA: a roughly 3.9x swing in demand (490 MW to 1,887 MW) corresponds to price moves from -$19.85/MWh to $92.40/MWh, an amplitude of over $112/MWh. This reflects SA's exposure to wind variability rather than pure demand-driven scarcity — wind output at 1,371 MW currently supplies 97% of generation, with gas contributing just 43 MW combined across CCGT and OCGT, and battery output of 74 MW rounding out the mix. When wind is strong overnight, demand barely needs to move to send prices negative; when wind eases into the morning ramp, even moderate demand growth drives sharp price appreciation.
AEMO's forecast trajectory points to a second, larger price event ahead. Forecast RRP climbs from $59.55/MWh at 21:00 AEST tonight to a peak of $85.11/MWh around 10:00 AEST tomorrow (17 August evening into 18 August morning cycle), consistent with the same overnight-trough-to-morning-ramp pattern repeating. Prices are then forecast to collapse to single digits ($9.78-$10.62/MWh) through the afternoon and into the following evening, driven by an improving wind outlook (average wind potential rising to 6.8% by 18 August) alongside cool temperatures (11.7-17.1°C) keeping heating demand modest at 6.3 MW-equivalent. Traders should note the five identified low-price windows tomorrow between 03:00-16:30 AEST, each averaging $10-10.5/MWh with zero carbon intensity, offering clear load-shifting opportunities.
No active demand-side constraints are flagging today: the Murraylink control issue from 14 August has been resolved, and there are no non-conformance or intervention notices currently affecting SA. The one structural signal worth flagging is AEMO's MT PASA reserve notice pointing to potential Low Reserve Conditions in SA in July 2028 — not a near-term factor, but relevant for longer-dated risk positioning given SA's reliance on wind and interconnector flows during low-wind periods.