SA1 experienced a price spike to $491/MWh across three intervals (07:20, 07:25, and 07:45 on 22 June 2026), representing a moderate elevation above the typical $300–$375/MWh range observed in adjacent periods. The spike occurred during morning shoulder demand with substantial gas-fired generation (OCGT and CCGT) contributing over 1,500 MW to the region's supply mix.
The binding constraint F_T+RREG_0050 exhibited elevated marginal values ($68.31 and $25.40/MWh) during the price spike intervals, indicating this network or regional constraint was actively limiting supply and driving the price uplift. The recurrence of the spike at 07:45 following a brief price decline suggests the constraint became binding again as demand or network conditions shifted, with secondary binding constraints (F_T+RREG_0050 with lower values and F_TASCAP_RREG_0220) also present but contributing less to marginal 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.