South Australia (SA1) experienced high renewable penetration at 85.4% during the 00:35–00:55 UTC period on 27 August 2026, driven by substantial solar (976.52 MW combined) and wind (347.68 MW) generation. Regional spot prices remained modest, ranging from $18.46 to $49.23/MWh, with volatility in the 00:40–00:45 window despite high renewable supply.
The high renewable penetration reflects favourable generation conditions from both solar and wind resources during the night-to-dawn transition period. Price volatility in the early settlement intervals appears associated with binding constraints F_TASCAP_RREG_0220 (marginal value $10.99) and F_T+RREG_0050 (marginal value $5.44), which limited export capacity or operational flexibility, causing spot prices to spike to $49.23/MWh before moderating as demand or constraint conditions evolved.
Causal analysis generated by gridIQ's synthesis model from live AEMO market data: dispatch prices, generation mix, interconnector flows and market notices in the interval surrounding the event.