South Australia (SA1) experienced a moderate price spike reaching $324.01/MWh during the 23:05 and 23:10 intervals on 29 July 2026, with prices sustaining elevated levels across three consecutive five-minute settlement periods. The spike followed a sharp decline from an earlier peak of $353/MWh at 22:40, indicating volatile market conditions in the evening period.
The price elevation was driven by binding constraints on the dispatch, with multiple constraint identifiers recording marginal values during the spike period. The F_TASCAP_RREG_0220 constraint was active across all three intervals with marginal values of $5.48, $3.00, and $3.00/MWh respectively, whilst F_T+RREG_0050 and F_I+RREG_0220 constraints also bound with marginal values of $2.77/MWh each, collectively constraining available supply and supporting elevated pricing.
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.