VIC1 experienced two consecutive intervals of negative pricing at $-1.10/MWh during the evening of 24 July 2026, following a sharp price collapse from $5.08/MWh. The negative pricing was sustained across only two settlement intervals (19:35 and 19:40), representing a minor severity event in an otherwise low-price period.
The sustained negative pricing appears driven by a structural oversupply of generation relative to demand, with wind generation contributing approximately 5,964 MW (combined wind sources) against minimal dispatchable generation—gas generation was completely offline and battery discharge was negligible at 0.13 MW. The binding constraints with significant marginal values (constraint F_T+RREG_0050 at $4.55/MWh and F_TASCAP_RREG_0220 at $3.44/MWh) indicate transmission or regulatory limits were constraining the ability to export excess generation or balance the system, forcing the market price negative to incentivise load acceptance and generation reduction.
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.