The WEM experienced a moderate price spike in WA1 on 24 July 2026 at 09:50 UTC, with the regional reference price reaching $267.62/MWh—a sharp increase of $105.51/MWh (or 65%) from the previous interval. The spike occurred over a single five-minute trading interval following a gradual price rise across the preceding 25 minutes.
The price spike was driven by binding constraints with marginal values ranging from $3.66 to $3.98/MWh, indicating system stress within multiple constraint equations. While the generation mix shows substantial renewable and dispatchable capacity (wind at 1,475 MW, battery at 702.5 MW, and gas generation at 1,149 MW), the binding constraint profiles suggest the spike resulted from physical or operational limitations within the transmission or ramping domain rather than outright generation scarcity.
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.