WEM WA1 region experienced a moderate price spike to $267.98/MWh during the 11:45 trading interval on 12 August 2026, representing a sharp increase from the preceding $181.06/MWh recorded five minutes earlier. The spike was isolated to a single trading interval before prices did not continue climbing in the available data.
The price spike was driven by binding constraints with material marginal values, most prominently a constraint (F_TASCAP_RREG_0220) that contributed up to $7.47/MWh to the pricing outcome across multiple intervals, indicating transmission or reserve capacity limitations. The generation mix showed substantial reliance on gas-fired generation (1,296 MW OCGT and 574 MW CCGT combined) alongside battery storage output of 456 MW, suggesting the region was dependent on higher-cost thermal and storage resources to meet demand, likely due to lower renewable generation availability relative to peak requirements.
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.