VIC1 experienced sustained negative pricing during the early morning period of 21 September 2026, with prices reaching a minimum of -$13.39/MWh across three intervals between 04:40 and 05:10. The region's generation mix was dominated by wind (2,072 MW combined) and solar (738 MW), along with substantial brown coal generation (2,052 MW), creating an oversupply condition typical of low-demand periods with high renewable output.
The negative pricing reflects a structural oversupply of generation relative to demand during the early morning period, with renewable sources (wind and solar) collectively generating over 2,800 MW in a low-demand interval. The binding constraint F_T+LREG_0050, which carried marginal values between $36.91 and $45.62/MWh across the affected intervals, indicates that physical network or operational limitations prevented efficient dispatch of this excess generation, forcing the market price negative as generators competed to avoid shutdown costs and manage plant operational requirements.
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.