Commodity Demand — SA1: Thursday 6 August 2026
South Australia's spot price sits at $119.52/MWh at 6:30am AEST, with demand at 1,562 MW — down from the overnight morning peak of 2,022 MW recorded around 6:55am AEST (18:55 UTC), when prices touched $144.27/MWh. The data shows tight price-demand coupling through the trading day: demand climbed from an overnight low near 985 MW (around 2:20am AEST, prices near $52/MWh) to the morning peak above 2,000 MW, with prices rising in step from double digits to the $130-144/MWh band. This elasticity reflects SA's generation stack today, where GAS_OCGT (607 MW) and GAS_CCGT (603 MW) are together supplying over 1,200 MW — more than 75% of current output — with wind contributing 389 MW and solar at zero given pre-dawn conditions. Gas-fired plant typically sets the marginal price in SA once wind and rooftop solar are insufficient, which explains the sharp price response to each demand increment through the morning ramp.
The demand trajectory eased through midday, falling from the ~2,022 MW peak to the current 1,562 MW as rooftop solar and moderating loads took hold, with prices correspondingly retreating from the $130-140/MWh range down to the $101-120/MWh band seen from 1pm to 3pm AEST. AEMO's forecast curve points to a renewed price lift into this evening, with forecast RRP climbing to $130.44/MWh around 8:00pm AEST and briefly to $188/MWh near 8:30am tomorrow's equivalent window — though the more immediate signal for traders is the forecast trough overnight, with prices dropping to the $40-55/MWh range between 12:30am and 3:00am AEST as demand falls back toward 1,000-1,100 MW territory.
Weather conditions reinforce this pattern: today's minimum of 9°C and maximum of 17.9°C with only 14.9% average solar potential and 2.6% wind potential keep renewable contribution modest through the mid-morning period, consistent with the current 27.5% renewable share and 0.4135 tCO2/MWh carbon intensity. Demand-side flexibility opportunities are evident in AEMO's identified load-shifting windows — a 1-hour window from 2:00-3:00pm AEST and 3:00-4:00pm AEST each show forecast prices near $10/MWh, and by 4:00-6:30pm AEST forecast prices near-zero to $6/MWh open a 1.5-hour low-cost window worth over $180/MWh in savings versus the peak. No SA-specific market notices currently flag load-shedding directions or generation constraints affecting demand-side conditions today, though the active reclassified contingency event in Queensland (Nebo transformer) warrants monitoring for any flow-on interconnector effects to SA pricing given historical NEM linkages during stressed periods.