WEM prices in Western Australia spiked to $352.26/MWh during the 12:05 trading interval on 30 August 2026, representing a 161% increase from the previous interval and a sustained step-change from the $115–135/MWh range observed in the preceding 25 minutes. The spike persisted for a single trading interval before resolution is not confirmed in the available data.
Binding constraints with marginal values of $4.76–$4.97/MWh were active during the event, indicating that network or reserve limitations constrained supply and pushed the system to elevated pricing. The generation mix shows a balanced portfolio with wind (743 MW combined), coal (430 MW), and gas resources (751 MW combined OCGT and CCGT), suggesting the spike was unlikely driven by large-scale generation unavailability; rather, the constraint-binding conditions point to locational or system strength constraints limiting access to available generation capacity to meet demand in the pricing interval.
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.