Commodity Demand — SA1: Thursday 27 August 2026
South Australia demand sits at 1,497 MW as of 6:30am AEST, up sharply from the overnight trough below 350 MW recorded around 3:20am. Spot price is $109.75/MWh, easing from the $130-220/MWh band that prevailed through yesterday evening's peak between 6:30pm and 7:30pm when demand hit 1,800-1,870 MW. The price-demand relationship this cycle has been steep: every 300-400 MW swing in load has moved price by $50-100/MWh, reflecting SA's thin generation stack outside wind and solar hours — current mix shows GAS_OCGT (378 MW) and GAS_CCGT (302 MW) covering the bulk of load, with wind at just 177 MW and battery output a modest 71 MW as solar sits at zero pre-dawn.
The five-minute price path over the past 24 hours shows the classic SA pattern: prices collapsed to near zero (as low as -$1.10/MWh) between 5:00-5:30am AEST as demand bottomed out near 300-450 MW overnight, then spiked into the $130-220/MWh range as evening demand ramped past 1,700 MW with limited wind support. AEMO's dispatch forecast for today points to a similar trajectory — prices easing to $10-30/MWh through the 10am-6pm window (AEST midday to early evening in target_time terms), before climbing back toward $110-140/MWh as the evening peak approaches after 5pm AEST. The morning ramp now underway (demand up from 350 MW to 1,497 MW in three hours) is the immediate driver of the current $109.75/MWh print, with gas plant following load closely.
Demand-side risk factors are notable today. AEMO issued a foreseeable intervention notice for voltage support in SA from 10:30am AEST, consistent with the pattern of directions issued to Torrens Island and Barker Inlet in the past week when synchronous generation has been thin. Separately, AEMO has flagged Minimum System Load (MSL1) risk for SA on both 30 and 31 August, with forecast demand potentially falling to single digits or negative in the early afternoon trough — a signal that rooftop solar penetration is pushing operational demand to levels requiring active management. For today, the immediate carbon intensity reading of 0.4063 tCO2/MWh and 24.94% renewable share reflects the gas-heavy morning mix; expect intensity to fall through midday as solar ramps, then rise again into the evening gas-covered peak.
Traders should note the afternoon low-price window (10am-4pm AEST forecast range $95-135/MWh) offers the best risk-adjusted entry for load-shifting strategies, while the evening 5-7pm AEST window carries the highest volatility risk given yesterday's $170-220/MWh prints at similar demand levels near 1,750-1,870 MW.