The WEM in WA1 experienced a moderate price spike to $252.50/MWh on 7 July 2026 at 08:25 UTC, representing a sharp increase from the preceding interval's $244.55/MWh. Prices had been escalating progressively over the preceding 15 minutes, rising from $185–189/MWh to above $240/MWh.
The binding constraint F_T+RREG_0050 was active throughout the spike period with marginal values ranging from $55.01 to $65.14/MWh, indicating it was the primary driver of the elevated pricing. The constraint's high marginal value contributed materially to the $252.50 settlement price, suggesting a tightness in a monitored system element that required pricing to balance supply and demand within operational limits.
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.