Regional Outlook — SA1: Sunday 30 August 2026
South Australia's spot price sits at $69.41/MWh as of 06:30 AEST, with demand at 1,414 MW. This follows an extremely volatile 24 hours: prices collapsed to negative territory overnight (down to -$18.31/MWh around 04:00 AEST on 30 August) as demand troughed near zero during minimum system load conditions, then spiked to a daily high of $145.12/MWh around 07:20-07:30 AEST as morning demand ramped past 1,000 MW. The current price sits well below yesterday's volatile peaks but above the overnight trough — a pattern consistent with SA's typical duck-curve dynamic.
Generation mix at the latest interval (20:30 AEST) shows wind leading at 789.76 MW, followed by gas OCGT at 264.57 MW, battery storage discharging 176.18 MW, gas CCGT at 137.26 MW, and solar at 0 MW (post-sunset). Renewable penetration sits at 70.62%, though this has swung sharply through the day — dropping as low as 37.12% around 08:00 AEST when wind eased and demand climbed, before recovering through the afternoon as wind generation strengthened. Carbon intensity currently reads 0.1749 tCO2/MWh, down from a daily peak of 0.3712 tCO2/MWh at 08:00 AEST and tracking toward overnight lows near 0.03-0.04 tCO2/MWh seen in the prior low-demand window.
Predispatch forecasts point to a volatile day ahead. Prices are expected to ease into the $95-100/MWh range through 21:00-22:30 AEST tonight, then fall into single digits and negative territory overnight (-$2.77 to -$3.19/MWh forecast around 02:00-04:30 AEST on 31 August) as wind output and low demand dominate. A sharp morning ramp is forecast from 07:00 AEST, with prices climbing to a forecast peak of $155.21/MWh around 10:00 AEST as demand builds and solar has yet to offset gas-fired peaking plant. Prices then taper back to single digits by 17:00-18:00 AEST. Weather supports this: solar potential is minimal overnight but average wind potential remains low (1.1%) for 31 August, keeping the region reliant on gas and battery dispatch through the morning peak.
Several active AEMO notices are relevant. A forecast Minimum System Load (MSL1) condition is flagged for SA today, 31 August, from 13:00-14:00 AEST, with minimum demand expected to trough around 168 MW at 13:30 AEST — traders should watch for negative pricing risk in this window. Separately, a planned MarketNet Variable VPN security edge device upgrade is scheduled for 3 September (10:00-15:00 AEST), which may cause brief connectivity interruptions for market participants using variable VPN connections. No active AEMO intervention directions remain in place for SA following cancellation of the Torrens Island and Barker Inlet voltage support directions issued in the preceding days.