WA1 experienced a moderate price spike to $266/MWh at 11:20 UTC on 11 August 2026, followed by escalation to $366+ in subsequent intervals. The spike represents a sharp 67% increase from the preceding $159.76/MWh settlement and occurred within a single trading interval before prices continued rising.
The binding constraint F_T+RREG_0050 exhibited a substantial marginal value of $237.49, which correlates closely with the magnitude of the price spike and indicates a tightness in system regulation or reserve capacity. The persistence of binding constraints with elevated marginal values across multiple intervals, combined with the continued price elevation in following periods, suggests sustained system-wide pressure on available reserve or regulating capacity rather than a transient supply disruption.
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.