Commodity Demand — SA1: Friday 22 May 2026

South Australia's spot price sits at $48.05/MWh at 06:30 AEST with demand at 1,349 MW — both relatively subdued for a Saturday morning. The price trajectory over the past several hours tells a clear story: when demand peaked near 1,850 MW in the 18:00–19:00 AEST window overnight, prices held in the $110–$160/MWh band consistently, with a spike to $327/MWh at 14:00 AEST (00:00 UTC) as demand climbed through 1,300 MW against tight overnight supply conditions. The current 1,349 MW demand level, combined with wind generating 1,323 MW and renewables at 96.86% of the mix, is suppressing prices to near-floor levels — the market is essentially long on wind right now.

Demand is running around 300 MW below where it was at equivalent intervals in the overnight peak, and with 100% cloud cover, zero solar potential, and a mild 13.5°C, today's heating-driven demand will be modest. The weekend profile typically sees SA demand plateau in the 1,300–1,500 MW range through the morning before a late-afternoon/early-evening uptick. Forecast prices for the 07:00–09:30 AEST window (21:00–23:30 UTC) cluster in the $49–$79/MWh range across multiple forecast runs, a material step up from current levels, consistent with demand lifting toward that 1,500–1,600 MW zone where gas CCGT becomes price-setting.

The sensitivity relationship is pronounced in today's data: below roughly 1,350 MW with strong wind, SA clears sub-$50/MWh; once demand crosses 1,500 MW and wind eases, the marginal setter shifts and prices move to $100–$170/MWh. That transition is the key watch point today. Wind potential is forecast at just 2.1 average for today with gusts at 13.4 km/h currently, meaning the current wind surplus supporting sub-$50 prices is not guaranteed to persist as demand builds. Traders should note the overnight period (roughly 12:00–16:00 AEST) carried sustained prices of $130–$200/MWh at demand levels of 1,250–1,350 MW — directly attributable to wind underperforming relative to current conditions — which sets the risk scenario if wind eases into this evening's demand ramp.

One operational flag: AEMO has scheduled a Cisco ISE server maintenance outage today from 20:00–03:00 AEST, with SSL VPN authentication delays possible. This is a market systems notice, not a generation or network constraint, but participants connecting via SSL VPN should confirm connectivity ahead of any evening session activity. No SA-specific network or reserve notices are currently active.