The WEM WA1 region experienced a sharp price spike to $334.52/MWh in the 02:25 trading interval on 6 July 2026, representing a more than doubling of price from the preceding interval at $157.98/MWh. The spike was isolated to a single five-minute interval during the overnight period when wind generation was substantial at approximately 1,292 MW combined.
The price spike was driven by binding constraints with material marginal values, most notably constraint F_S+TBTU_L1 with a marginal value of $40/MWh, indicating transmission limitation scarcity. The repeated binding of constraint F_TASCAP_RREG_0220 with a marginal value of $5.5/MWh across the interval also contributed to the dispatch constraint. These binding constraints collectively limited available supply response capacity during the interval, forcing the market price to clear at substantially elevated levels despite adequate aggregate generation from coal, wind, and gas-fired plant.
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.