VIC1 experienced sustained negative pricing across three intervals on 8 August 2026 at 19:50–20:25, with the minimum price reaching −$6.60/MWh in the first interval. The region saw high wind generation (approximately 2,863 MW) coinciding with substantial brown coal output (2,790 MW), creating an oversupply condition that depressed prices into negative territory.
The negative pricing was driven by excess supply relative to demand, with wind and brown coal together contributing over 5,650 MW of generation in a region unable to absorb or export the full volume. Binding constraints with positive marginal values (constraint_id F_T+RREG_0050 at $5.50/MWh and F_TASCAP_RREG_0220 at $4.97/MWh) indicate that transmission limitations restricted the ability to relieve local oversupply through interregional flows, forcing the dispatch to accept negative pricing to maintain system balance.
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.