Commodity Demand — SA1: Wednesday 24 June 2026

South Australia sits at 1,620 MW demand and $165.68/MWh at 06:30 AEST, well below the day's peak of 2,224 MW reached at 18:30 AEST when prices were trading around $297–$305/MWh. That morning peak behaviour is the dominant pattern today: demand climbs steeply from the overnight trough of around 916 MW (approximately 13:20 AEST) through the pre-dawn ramp to a sustained plateau above 2,100 MW between 18:00 and 19:00 AEST, before easing back toward current levels. Notably, price sensitivity to that demand surge was comparatively muted — the $297–$330/MWh range held through most of the 2,100–2,200 MW band, a markedly different dynamic to the overnight session where prices spiked to $606–$875/MWh at demand levels around 1,680–2,100 MW, indicating tighter supply conditions or generator rebidding during that earlier window.

The current 1,620 MW level places SA in a transitional phase — demand is rising from the post-evening trough as heating loads build through the early morning hours. At 5.5°C with 96% cloud cover and a heating demand index of 12.5, residential and commercial space heating continues to underpin the load trajectory. The forecast price path reflects this: AEMO's pre-dispatch has prices lifting from $170/MWh at 07:00 AEST to a local peak of $240–$241/MWh around 18:30 and 20:00 AEST, consistent with demand recovering toward the 1,800–2,000 MW range as the working day begins and again through the evening. The 22:30 AEST forecast of $241/MWh represents today's projected price ceiling, which is materially below the overnight spikes observed earlier in the session — suggesting the market anticipates adequate supply cover through the peak.

Generation is currently balanced across wind (673 MW), gas OCGT (453 MW), gas CCGT (424 MW), and battery dispatch (8 MW), with solar offline overnight. The active Buronga B Bus 7118 220kV isolator constraint (notice 144329/144333) on the V-S-MNSP1 interconnector remains in force, which limits SA's ability to draw on Victorian capacity and adds a structural constraint to supply-side flexibility through the morning ramp. Traders should note that from today AEMO increases the Very Fast Contingency FCAS cap in SA from 100 MW to 150 MW during credible islanding periods — this marginally improves frequency response headroom but does not directly ease energy supply constraints. Demand-side flexibility targeting the 14:30–15:30 AEST window (forecast $105–$118/MWh) offers the clearest price advantage before the afternoon-to-evening demand rebuild.