VIC1 experienced sustained negative pricing reaching −$0.55/MWh across two intervals (18:35 and 18:45) on 8 September 2026, with prices hovering near zero in surrounding periods. The event occurred during elevated wind generation (approximately 5,901 MW combined) and brown coal baseload (2,934 MW), creating oversupply conditions in the region.
The negative pricing reflects a supply-demand imbalance where wind and coal generation exceeded regional demand, requiring participants to pay for dispatch. The binding constraint F_T+LREG_0050 with marginal values ranging from $6.43 to $7.01 per MWh indicates an active network or system security limitation was constraining export capacity or load absorption, preventing efficient surplus generation transfer and forcing local dispatchable units offline, thereby pushing the marginal price negative.
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.