The WEM region WA1 experienced a moderate price spike to $256.83/MWh at 23:20 on 27 August 2026, representing a sharp increase from the preceding interval at $175.36/MWh. The spike occurred as a single-interval event within an otherwise elevated pricing period, with prices ranging between $132–$176/MWh in the five preceding intervals.
The price spike was driven by one or more binding constraints with substantial marginal values, particularly constraint T_BLINK_TV_NGZ with a marginal value of $8.352M, indicating a severe congestion or operational limit. Supplementary constraints F_T+LREG_0050 and F_T+RREG_0050, with marginal values of $21.07 and $5.44 respectively, also contributed to the supply limitation, suggesting concurrent pressure on system regulation and ramping capacity as demand or generation variability exceeded available flexible resources in the dispatch 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.