The WEM WA1 region experienced a moderate price spike to $268.90/MWh during the 22:05 trading interval on 24 September 2026, representing a sharp increase from the preceding $140.44/MWh level. The spike was isolated to a single interval before prices stabilised, occurring during an evening period with mixed generation sources including substantial gas-fired output.
Multiple binding constraints with material marginal values indicate transmission or operational limitations constraining supply. The binding constraint F_T+LREG_0050 contributed marginal values of $19.85/MWh and $11.69/MWh, whilst F_TASCAP_RREG_0220 contributed $7.49/MWh, $4.99/MWh and $4.97/MWh, collectively accounting for approximately $49 of the price elevation. The remaining price lift to $269/MWh reflects either demand-side pressure, reserve requirements, or generation-side scarcity during the interval, though gas-fired generation (745 MW OCGT + 300 MW CCGT) comprised a substantial portion of the supply stack at that time.
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.