The WEM experienced a moderate price spike in WA1, with the RRP reaching $260.44/MWh at 14:20 UTC on 7 July 2026, up sharply from $125.63/MWh just 25 minutes earlier. Prices continued rising to $276.10/MWh in the following interval, representing a doubling of the underlying price level within a 30-minute window.
The spike was driven by binding constraints on system operations, with constraint F_TASCAP_RREG_0220 exhibiting the highest marginal value at $19.67/MWh, indicating a tightening of network or operational limits that restricted supply availability. The rapid price escalation across successive intervals, combined with active binding constraints and significant reliance on higher-cost generation (including 621 MW of gas OCGT and 742.79 MW of battery output), suggests the market moved through a period of constrained dispatch where marginal costs rose sharply to clear reduced available supply.
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.