SA1 experienced minor negative pricing in two consecutive intervals (02:20 and 02:25 on 8 June 2026), with minimum prices reaching −$0.09/MWh. The event occurred during early morning periods with high renewable generation, particularly wind at 758 MW and solar at approximately 406 MW combined.
The negative pricing resulted from oversupply conditions driven by high wind and solar generation coinciding with low demand typical of early morning periods. A binding constraint (F_T+RREG_0050) with a marginal value of $3.82/MWh was active throughout, indicating that constraint-related restrictions limited the market's ability to export excess generation or manage the renewable surplus, forcing prices into negative territory to incentivise consumption.
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.