The WEM experienced a major price spike in WA1 at 06:10 on 30 May 2026, with the RRP surging to $367.44/MWh—more than double the preceding interval price of $179.63/MWh. This spike occurred across a single trading interval during the early morning period, representing a sudden and significant market disruption.
The price spike appears driven by binding transmission constraints, particularly the F_TASCAP_RREG_0220 constraint which dominated the marginal value stack with multiple entries at $7.80–$8.55/MWh, indicating severe congestion limiting interconnector capacity or local transmission. The timing during early morning (06:10) combined with the constraint-driven dispatch suggests a supply-demand imbalance where available generation could not efficiently reach demand points due to network limitations, forcing the market to rely on higher-cost marginal plant (likely OCGT or CCGT) to resolve the congestion.
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.