SA1 experienced a severe price spike reaching $4,981/MWh in the 16:35 interval on 30 July 2026, before prices normalised to $560/MWh in subsequent intervals. The spike occurred over a single interval within the broader context of elevated pricing that had been building across the preceding 25 minutes, with prices rising from $560/MWh to $875/MWh prior to the event.
The price spike was driven by binding constraints with material marginal values, particularly constraint F_TASCAP_RREG_0220 which held marginal values of $8.99, $7.78, and $4.87 across the spike period, indicating severe scarcity in the constrained element. The rapid normalisation of prices to $560/MWh in the following intervals, coupled with the absence of significant generation changes, suggests the binding constraint was relieved, likely through either a dynamic reassessment of available supply or resolution of the underlying network or reserve limitation that had constrained the region during 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.