Commodity Demand — SA1: Wednesday 29 July 2026
South Australia demand sits at 1,599 MW as of 06:30 AEST, with spot price at $353/MWh — well above overnight lows but off the extreme peaks seen through yesterday evening's ramp. Demand has climbed sharply from a 3:45pm trough near 950 MW (when prices briefly went negative, touching -$1.09/MWh) through the evening peak, tracking the classic winter morning heating load build with current temperatures at 3.8°C and heating demand elevated at 14.2 (index).
Price sensitivity to demand is pronounced in this market: the data shows a clear non-linear relationship where each ~100 MW of demand growth above 1,800 MW triggers disproportionate price responses. Wednesday's evening peak saw demand reach 2,155 MW near 08:50 AEST (prior day equivalent) alongside prices sustaining $170-300/MWh, with a spike to $845/MWh at 1,965 MW demand. Wind generation is currently negligible (40 MW) and solar sits at zero given overnight/pre-dawn conditions, leaving gas (OCGT 690 MW, CCGT 526 MW) and battery (119 MW) to cover the bulk of the 1,599 MW load — this thin renewable contribution (11.6% renewable penetration, carbon intensity 0.51 tCO2/MWh) is amplifying price responsiveness to demand upticks.
The forecast trajectory for today is materially bullish on price. AEMO's forward curve shows forecast RRP escalating from $300/MWh at 07:30 AEST to $820-875/MWh through the 08:00-13:30 window, coinciding with the LOR1 reserve condition flagged for 07:00-12:00 AEST (forecast capacity reserve requirement 386 MW against 357 MW available). A second LOR1 window is flagged for 17:00-22:30 AEST (400 MW required vs 379 MW available), aligning with forecast prices staying elevated at $750-875/MWh into early afternoon before easing to $139-170/MWh by mid-afternoon as gas dispatch and possible solar contribution (avg solar potential 5.5 for today) relieve pressure.
Demand-side signals reinforce a tight morning and evening system: AEMO's reserve notices for SA specifically call out capacity shortfalls in both the 07:00-12:00 and 17:00-22:30 windows, and the ongoing VIC constraint set (CA_SYDS_597B5710) affecting V-SA interconnector flows limits SA's ability to import cheaper power during these stress periods. Traders should expect price volatility to track demand closely through both peak windows, with the 08:00-11:00 AEST period carrying the highest risk of price spikes given the LOR1 declaration coincides with minimal wind and building heating load.