WA1 experienced a moderate price spike to $252.46/MWh during the 07:10 settlement interval on 12 July 2026, following a sharp jump from $155.41/MWh in the preceding interval. Prices remained elevated at $245.59/MWh across three consecutive intervals prior to the spike, suggesting sustained upward pressure on the market.
The binding constraints with the highest marginal values (F_TASCAP_RREG_0220 at $5.55/MWh and F_TASCAP_LREG_0210 at $3.23/MWh) indicate that system regulation and ramping capability limitations were constraining supply during the spike period. The generation mix shows reliance on gas-fired generation (OCGT 485.73 MW and CCGT 332.28 MW) accounting for approximately 62% of total output, which typically carries higher marginal costs, combined with binding constraints limiting flexibility to adjust supply in response to demand changes.
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.