Commodity Demand — SA1: Thursday 28 May 2026
South Australia's spot price sits at $103.86/MWh at 06:00 AEST with demand at 1,422 MW — a sharp retreat from the day's intraday high of 1,935 MW reached around 18:25–18:35 AEST when prices were running in the $145–$165/MWh range. The price-demand relationship across today's trading has been pronounced: demand above 1,800 MW consistently attracted prices in the $150–$200/MWh band, while the current overnight trough has compressed the spot to sub-$110/MWh territory. The most extreme price-demand dislocation occurred during the 02:25–02:45 AEST window (16:25–16:45 UTC) when demand had already fallen to the 1,370–1,400 MW range yet prices spiked to $262–$299/MWh, indicating supply-side tightness or dispatch constraint rather than demand pressure at that point.
The overnight demand trough — bottoming near 1,096 MW around 14:30 AEST — produced the lowest prices of the day (sub-$94/MWh), and the current 1,422 MW level sits modestly above that floor. Generation is currently 944 MW wind, 370 MW gas OCGT, and 164 MW gas CCGT, with solar at zero given the overnight hour. Carbon intensity has fallen sharply to 0.2169 tCO2/MWh with renewable penetration at 63.9%, both reflecting the strong wind contribution relative to current demand. Temperature is 12.3°C with full cloud cover, and today's forecast max of 16.9°C means heating demand will build through the morning but will not reach levels that drive aggressive price escalation.
The forward forecast for the 07:00 AEST interval (21:00 UTC) points to $130/MWh, down considerably from earlier intraday forecasts that had that interval priced at $138–$172/MWh. The 07:30 AEST interval is forecast at $130.72/MWh. Load window modelling signals optimal demand windows from 08:30–10:30 AEST (00:30–02:30 UTC) with prices forecast in the $56–$85/MWh range — well below the current spot — as overnight demand stays compressed and wind generation remains the dominant dispatch source. The morning demand ramp will be the key price inflection point: if today's pattern mirrors the prior trading day, expect demand to climb from the current 1,400 MW range toward 1,700–1,900 MW between 06:30 and 08:30 AEST, which historically has pushed SA prices into the $140–$195/MWh band.
One demand-side factor worth flagging: the Tailem Bend 275 kV East Bus outage (constraint set S-TB275_E_BUS, invoked 24 May) continues to limit V-SA interconnector headroom. This reduces SA's ability to import from Victoria during peak demand intervals and has likely contributed to the elevated price sensitivity seen when SA demand exceeds ~1,700 MW. Traders positioning around the morning ramp should account for this constraint remaining active — any demand surge above 1,800 MW with limited interconnector support will put upward pressure on dispatch prices disproportionate to the demand quantum alone.