commodity demand sa — SA1

South Australia's spot price sits at -$20/MWh with demand at 1,567 MW as of 06:35 AEST, a demand level that has risen steadily over the past two hours from a overnight trough near 514 MW at 14:15 AEST. Despite demand climbing back toward morning peak territory, wind generation of 608 MW combined with 165 MW of gas CCGT is keeping the grid well-supplied — renewables are covering 78.7% of load at 0.1044 tCO2/MWh — and prices remain negative. The disconnect between rising demand and persistently negative prices reflects the structural surplus of wind output overwhelming incremental load growth at this hour.

The demand trajectory through today tells a clear story for price direction. The overnight trough drove prices to -$190/MWh between 14:05–14:15 AEST (demand at ~520 MW) as wind surplus swamped the grid with no thermal floor. As demand recovered through the pre-dawn and morning hours, prices lifted toward zero and briefly turned positive in the 7:35–8:55 AEST window ($8–$31/MWh range) when demand was tracking 1,360–1,620 MW — the only sustained positive-price window in today's data. From 10:05 AEST onward, demand eased back from the ~1,650 MW morning peak and prices returned firmly negative, suggesting the market's marginal clearing unit is wind-constrained generation requiring grid access rather than demand-responsive gas.

For the remainder of Friday, the key price driver is whether evening demand growth — which is now building toward what should be a 1,700–1,850 MW late-afternoon/early-evening peak — can outpace wind generation and push the dispatch stack back into positive territory. The forecast RRP for the 07:00 AEST target interval sits at just $0.30/MWh, confirming AEMO's expectation that surplus supply persists into the evening. Friday demand typically softens compared to mid-week business days, which reduces the probability of an evening price spike. Demand-side participants with flexible load should note the extended negative-price window through this morning as an optimal consumption period, with load windows flagging prices as low as -$59/MWh through the 08:30–09:00 AEST period.

The single market notice directly relevant to SA pricing was the reclassification of the Penola West–South East 132 kV and Kincraig–Penola West 132 kV lines as a credible contingency event at 15:24 AEST due to lightning, subsequently cancelled at 16:29 AEST. No constraint sets were invoked on the SA interconnector, so the episode had no material impact on SA spot pricing or Heywood flows. The VIC Yallourn–Rowville double-circuit reclassifications are a Victorian network matter and do not directly constrain SA import or export capacity today.