WA1 experienced a sharp price spike to $335.18/MWh during the 08:55 trading interval on 5 July 2026, representing a 71% increase from the preceding interval's $196.24/MWh. The spike was isolated to a single trading interval before prices stabilised. Price escalation occurred over a five-interval period from 08:30 onwards, with the final interval exhibiting an abrupt jump.
The binding constraints with the highest marginal values (F_TASCAP_RREG_0220 at $4.96/MWh and F_T+RREG_0050 at $3.42/MWh) indicate system limitations on regulation services availability during a period when demand required rapid response. Despite substantial generation capacity across the mix (coal, wind, gas, and battery), the constraint marginal values suggest the system faced a tightness in operationally-constrained capacity required to maintain frequency control and system security in that 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.