Commodity Demand — SA1: Sunday 29 March 2026
South Australia's spot price sits at $131.54/MWh with demand at 1,514 MW as of 07:30 AEST, reflecting the Monday morning ramp-up that has driven prices sharply higher over the past two hours. The demand-price relationship is stark in today's data: prices were negative — reaching as low as -$189/MWh around 03:00 AEST — when overnight demand bottomed out below 30 MW of net regional load, driven by wind generation (338 MW currently) overwhelming minimal consumption. From that trough, every 100 MW increment in demand through the morning ramp has corresponded to a roughly $15–20/MWh lift in the spot price, with the steepest price acceleration occurring between 05:30 and 07:30 AEST as demand climbed from ~430 MW to over 1,500 MW — a move that pushed prices from negative territory through to the current $131.54/MWh in under four hours.
The intraday price sensitivity is amplified by SA's generation mix: with solar offline (0 MW, 95% cloud cover) and gas CCGT carrying 247 MW alongside 339 MW of wind, the grid is leaning heavily on thermal capacity to meet the Monday morning surge. Renewable penetration has already slipped to 57.81% from above 80% during overnight hours, and carbon intensity has risen accordingly to 0.2067 tCO2/MWh — more than double the overnight low of 0.0654 tCO2/MWh. Demand is still climbing toward what the price history pattern suggests is a typical weekday peak in the 1,500–1,540 MW range around 09:00–09:30 AEST, a band where SA has repeatedly printed prices above $150/MWh and spiked to $198/MWh in recent intervals.
Forecasts for the 09:00 AEST trading period point to prices easing back toward $88–$104/MWh as the morning peak plateaus and marginal generation capacity comes online, but the trajectory is contingent on whether demand pushes above the 1,538 MW peak seen at 06:30 AEST. Traders should note that AEMO has issued "Prices Subject to Review" market notices under NER Clause 3.9.2B for every interval between 03:00 and 10:30 AEST, covering the entire pre-dawn negative price episode through to this morning's ramp. These notices signal potential manifestly incorrect inputs during a period of extreme price volatility; the 04:25 interval has already been reviewed and confirmed unchanged, but the bulk of negative-price intervals — including the -$189/MWh spike at 03:00 AEST — remain under active review, which introduces material settlement risk for positions taken across that window.