SA1 experienced high renewable penetration at 90.5% during the early morning period of 2 September 2026, with combined wind and solar generation exceeding 724 MW. Regional reference prices rose sharply from $2.10/MWh to a peak of $28.88/MWh between 00:05 and 00:20, before declining to $14.95/MWh by 00:35.
The rapid price escalation despite high renewable supply suggests constraint-driven scarcity pricing rather than energy scarcity. Multiple binding constraints with substantial marginal values—particularly constraint F_T+LREG_0050 ranging from $14.34/MWh to $4.89/MWh, alongside F_TASCAP_RREG_0220 ($4.68/MWh) and F_T+RREG_0050 ($4.43/MWh)—indicate that physical network or service limitations became binding during this period. The subsequent price decline suggests either constraint relaxation or adjustment in dispatch to accommodate the renewable generation profile.
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.