Commodity Demand — SA1: Sunday 9 August 2026

South Australia's spot price sits at $54.52/MWh at 06:30 AEST with demand at 1538 MW, up from an evening low near 1420 MW an hour earlier. Overnight demand troughed around 1000-1100 MW between 02:00-03:00 AEST, coinciding with negative prices as low as -$7/MWh, before climbing sharply through the 05:00-08:00 AEST morning ramp. Demand peaked at 2065 MW near 08:55 AEST, driving prices to $88-90/MWh, with a brief spike to $116.90/MWh at 11:40 AEST as demand eased back toward 1750 MW. This morning's price-demand relationship is tight: each 300-400 MW swing in demand through the ramp corresponded to $30-50/MWh price movement, indicating thin marginal supply margins during the transition from overnight wind-dominated generation to daytime peak.

Wind generation is currently supplying 1988 MW against total demand of 1538 MW, pushing renewable penetration to 96% and carbon intensity down to 0.0196 tCO2/MWh — this oversupply explains the negative and near-zero pricing seen through the 15:50-19:55 AEST window yesterday and into this morning's shoulder periods. Gas CCGT (83 MW) and a small battery contribution (6.3 MW) are filling the residual gap. AEMO's forecast trajectory for today points to a strong afternoon price escalation: from $61-79/MWh through the 07:00-08:00 AEST window, spot forecasts climb to $101-130/MWh by 08:30-11:30 AEST, then spike to $373.37/MWh at the 12:00 AEST (22:00 local settlement) interval before easing back to $70-90/MWh range through the afternoon and evening.

That forecast spike is the key risk window for today — traders should watch the 21:30-22:30 UTC (07:30-08:30 AEST tomorrow-equivalent settlement) period closely, as it implies a demand-driven tightening likely linked to reduced wind output forecast for later today (wind potential dropping to 14.9% average per the daily outlook, down from current 35% wind potential) combined with cooler temperatures (11.4-14.4°C forecast range) lifting heating load. Grid stress is already elevated at a 68.4 score despite current price stability sitting at 47. On the notices front, AEMO cancelled the SA intervention event and associated Torrens Island direction effective 04:00 AEST today, and reverted the Brinkworth-Davenport/Templers West 275kV line contingency classification to non-credible following the lapse of the severe weather warning — removing two sources of dispatch constraint that had been shaping SA pricing over the prior 48 hours. With those constraints lifted and wind still strong at 1988 MW, near-term price relief is likely, but the afternoon demand ramp combined with forecast wind decline remains the dominant driver to watch.