VIC1 experienced sustained near-zero and marginally negative pricing across five consecutive intervals (15:30–16:05 on 16 June 2026), with the lowest settlement at −$0.10/MWh. The region's generation was dominated by wind (6,125 MW combined) and brown coal (3,256 MW), totalling approximately 9,382 MW against relatively modest demand.
The negative pricing reflects oversupply conditions where available generation substantially exceeded demand, forcing the market price toward zero and into negative territory. Binding constraints with marginal values of $31.30 (F_T+LREG_0050) and $3.45 (F_MAIN+RREG_0220) indicate that frequency or regulation service requirements—rather than transmission line congestion—were active constraints during the period, suggesting that the core driver was inflexible generation (particularly coal baseload and high wind output) that could not be economically reduced to match lower demand without incurring constraint costs.
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.