SA1 experienced sustained negative pricing with the region reaching −$3.09/MWh during the 01:45 settlement interval on 30 August 2026, with negative prices occurring across 2 consecutive intervals. Prices declined progressively from $7.87/MWh to negative territory over a 30-minute period, indicating a rapid shift in supply–demand balance.
The negative pricing was driven by substantial renewable generation, with approximately 771 MW of combined solar and wind output during the event window, exceeding regional demand. The binding constraint F_T+LREG_0050 remained active across all observed intervals with declining marginal values (from $21.32/MWh to $16.72/MWh), indicating a persistent transmission or network constraint that limited the region's ability to export excess renewable energy, forcing the dispatch algorithm to accept negative prices to manage surplus supply.
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.