VIC1 experienced sustained negative pricing on 11 July 2026, with prices reaching −$4.67/MWh during the 12:20 interval and remaining negative at −$1.15/MWh in the following interval. This two-interval period of negative pricing represents a minor severity event in an otherwise moderately priced trading window.
The negative pricing occurred during a period of high renewable generation, with wind contributing 3831.83 MW and brown coal providing 4185.41 MW of output, creating an oversupply relative to demand. The binding constraint F_T+RREG_0050, active across both negative-price intervals with marginal values of $4.05 and $3.85/MWh, limited the ability to export excess generation or reduce dispatchable output, forcing marginal costs below zero as flexible generation sources could not be economically withdrawn.
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.