Commodity Demand — SA1 — Saturday 2 May 2026

South Australia's spot price sits at -$2.18/MWh at 06:35 AEST with demand at 1,273 MW — the lowest point observed across today's data. This is a Sunday low-demand profile in action: demand has been falling steadily from an overnight high around 1,500 MW recorded near 12:45 AEST, and the current trough is driving prices firmly negative. The inverse relationship between demand and price is clearly visible across the dataset — when demand peaked near 1,660 MW during the mid-morning window (approximately 18:10–19:10 AEST), prices hovered near zero or in shallow negative territory, while the deepest negative prints of -$10.23/MWh occurred during the solar-peak midday period (22:10–23:00 UTC, or roughly 08:10–09:00 AEST) when generation supply outpaced even relatively firm demand. The notable exception was the pre-dawn period around 14:30–15:35 UTC (00:30–01:35 AEST) when demand climbed toward 1,625 MW and prices briefly spiked to $98/MWh, illustrating just how price-sensitive the SA market is when supply is tight and demand tests capacity limits.

Wind is currently generating 697.59 MW against 112.89 MW of gas (CCGT), with solar at zero given the overnight hour. Renewable penetration sits at 86.07% and carbon intensity at 0.0683 tCO2/MWh. As the morning progresses and solar generation builds — the daily outlook shows average solar potential of 4.8 with 60% cloud cover today — the supply-demand balance is likely to keep prices negative or near zero through the mid-morning, consistent with the pattern observed at equivalent demand levels overnight. The 13.2°C temperature and a heating demand index of 4.8 suggest modest space heating load will begin lifting demand off its current trough as households and commercial premises activate through the morning, but the Sunday profile limits the pace of that recovery.

Forecast RRPs for the 07:00 and 07:30 AEST half-hours are anchored between -$2.01/MWh and -$3.00/MWh, consistent with current conditions. However, the forward load window data signals a material shift from around 11:30 AEST onward (01:30 UTC), where forecast prices step down sharply to the -$5/MWh to -$12/MWh range — reflecting anticipated solar generation ramping into a demand profile that, on a Sunday, will not grow to meet it. The deepest forward forecasts cluster around the 13:00–14:30 AEST window at prices as low as -$20/MWh, which represents the optimal consumption window for flexible loads and battery charging today. Demand-side participants with dispatchable load should note that this negative price window is well-signalled and persistent, with no market notices flagging any SA-specific supply constraint today.