VIC1 experienced sustained negative pricing at $-0.10/MWh across two consecutive intervals (02:55 and 03:05 on 2026-08-22), representing minor negative price events. Prices declined sharply from $5.43/MWh at 02:40 to negative territory, with the region then recovering to slightly positive pricing shortly after.
The negative pricing was driven by substantial renewable energy generation—approximately 2,869 MW of combined wind output plus 788 MW of solar—coinciding with overnight demand conditions that could not absorb all available supply. Multiple binding constraints with significant marginal values (ranging from $3.35 to $5.00/MWh) were active during this period, indicating transmission or network limitations that prevented efficient dispatch of excess generation out of the region, forcing prices negative to clear the local market.
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.