WEM prices in WA1 spiked to $250.03/MWh on 10 July 2026 at 08:45 AWST, representing a moderate price event affecting a single 5-minute trading interval. Prices had escalated sharply from $142.46/MWh just 25 minutes earlier, with the steepest rise occurring between 08:35 and 08:40.
The binding constraint F_T+RREG_0050 with a marginal value of $4.06/MWh was active during the spike interval, indicating a constraint-driven price elevation. The generation mix shows substantial reliance on thermal generation (BLACK_COAL at 887.35 MW and GAS_CCGT at 331.56 MW) alongside high battery output (505.38 MW), suggesting the system was managing tight supply conditions or constraint-limited dispatch, resulting in the marginal cost elevation captured in the binding constraint.
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.