Commodity Demand — SA1 — Tuesday 28 April 2026

South Australia's spot price sits at $96.13/MWh with demand at 1,410 MW as of 06:30 AEST — a moderate level consistent with the region's overnight-to-morning transition. The price-demand relationship across today's session has been sharply non-linear: demand peaked near 1,790 MW during the 18:00–19:30 AEST window (AEST equivalent of the 07:00–08:30 UTC morning ramp) with prices repeatedly printing $225–$276/MWh, while the overnight trough around 700–840 MW saw spot collapse to negative territory, with multiple intervals printing below -$2/MWh. The current 1,410 MW level sits in a transitional zone where pricing is sensitive to small movements — the $80–$100/MWh band observed between 1,350 MW and 1,470 MW is relatively stable, but the history of this session shows supply tightens quickly once demand exceeds ~1,500 MW.

The demand trajectory today follows a classic autumn weekday shape: a deep overnight trough, a sharp morning ramp peaking above 1,780 MW, a midday plateau in the 1,580–1,670 MW range with prices anchored to $103–$161/MWh, and an afternoon step-down through the 1,350–1,420 MW range with prices easing to the $77–$95/MWh band. Demand is now climbing again from the late-afternoon low, rising from around 1,320 MW at 05:00 AEST back to 1,410 MW, and the price response is already visible — the $83–$96/MWh corridor of the past 90 minutes reflects the market pricing in continued demand growth toward an evening peak. Forecast data for the 07:00–07:30 AEST half-hours (21:00–21:30 UTC) targets $95–$106/MWh, signalling the market expects moderate rather than severe tightening through the first part of the evening.

The evening period carries the key risk for today. A cancelled Forecast LOR1 notice (originally flagging a reserve shortfall between 18:00 and 20:30 AEST today, i.e., 04:00–06:30 UTC) was stood down by AEMO at 01:55 AEST, but it demonstrates how thin SA's reserve margin can become during demand peaks. With demand currently tracking upward and forecast RRP for the 07:30 AEST half-hour at $106–$109/MWh, the market is pricing a modest demand lift of perhaps 100–200 MW above current levels. Wind is generating 528 MW at 0.10 tCO2/MWh grid intensity, with gas CCGT contributing 133 MW and solar at zero given the pre-dawn timing — any wind drop during the evening ramp would require additional thermal response and would push prices toward the $138–$161/MWh band seen repeatedly during today's morning peak.

Load-shifting opportunity is significant tonight. Forward load windows from 08:30–09:30 AEST (22:30–23:30 UTC) show forecast prices in the $9–$47/MWh range, well below the current $96/MWh spot, as overnight wind generation is expected to push prices down sharply once the evening demand peak clears. Flexible consumers and battery operators should note the step-