Commodity Demand — SA1: Wednesday 15 April 2026

South Australia's spot price sits at $11.91/MWh at 06:35 AEST with demand at 1,384 MW — a sharp reversal from the sustained $138–$250/MWh range that persisted through the 17:00–02:30 AEST window when demand peaked at 1,683 MW around 18:45 AEST. The price-demand relationship across today's cycle is stark: every 200–300 MW step-up in demand through the morning ramp (06:00–09:30 AEST) translated directly into price escalation, with the 07:00 AEST breach of 1,124 MW coinciding with the first $170/MWh prints, and the 09:00–13:30 AEST plateau above 1,550 MW sustaining prices between $135/MWh and $280/MWh. Demand has now retreated from that peak plateau and, with solar output absent at this hour, wind (359.7 MW) and gas CCGT (101.48 MW) are covering the 1,384 MW load — a materially lower supply pressure point than midday conditions.

The forward price signal is decisively soft. Forecasts for the 07:00 AEST half-hour (21:00 UTC) sit at $22/MWh, and the 07:30 AEST window is forecast at $10–$12/MWh, consistent with overnight demand troughing below 700 MW as seen in today's 01:00–04:00 AEST interval where prices repeatedly printed below $10/MWh and touched $0/MWh. Load windows from 08:00–09:30 AEST (22:00–23:30 UTC) show forecast prices turning negative — ranging from -$0.05/MWh to -$7.69/MWh — deepening further to -$12/MWh to -$22/MWh through the 10:00–12:00 AEST window as wind generation is expected to remain elevated against low overnight demand. This negative price window is structurally driven by overnight demand compression well below 700 MW combined with must-run wind output.

The morning demand ramp starting around 06:00–07:00 AEST is the key price inflection point to watch today. Today's data shows demand climbed from ~716 MW at 06:00 AEST to 1,125 MW by 07:00 AEST and 1,683 MW by 09:45 AEST, with prices escalating from $35/MWh to $170–$238/MWh across that window. If the pattern repeats Thursday, prices will exit the negative/low regime and move through $50–$100/MWh from approximately 06:30–07:30 AEST (20:30–21:30 UTC), with the mid-morning demand plateau of 1,550–1,680 MW likely to restore prices into the $130–$200/MWh band absent any significant wind uplift. The gridIQ market conditions score of 37.9 and grid stress reading of 68.5 reflect this transitional, price-volatile phase between overnight lows and the impending morning ramp.