VIC1 experienced sustained negative pricing on 29 August 2026 in the early morning period, with the minimum price reaching −$33.92/MWh across 2 intervals. The region's generation mix was dominated by renewable sources (solar 618.67 MW and wind 413.32 MW) combined with significant brown coal output (2750.28 MW), creating a structural oversupply condition during the off-peak period.
The negative pricing was driven by excess renewable generation during low demand hours, with solar and wind together contributing over 1,000 MW of output that could not be efficiently absorbed by the region's demand profile. A binding constraint with marginal values ranging from $43.70 to $63.85/MWh indicates that dispatch flexibility was constrained by a network or service requirement (constraint_id F_T+LREG_0050), forcing the market to accept negative prices to clear supply rather than curtail the renewable generation.
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.