Victoria experienced sustained negative pricing at −$6.51/MWh across five consecutive intervals (17:00–17:30 on 12 July 2026), driven by high renewable generation. Wind output totalled approximately 6,365 MW whilst brown coal generation remained substantial at 3,054 MW, creating an oversupply condition that depressed prices below zero.
The negative pricing reflects minimum generation constraints limiting the ability to reduce synchronous generation quickly enough to match reduced demand. Binding constraints associated with Tasmania indicated marginal values up to $4.98/MWh, suggesting that inter-regional transmission or regional support requirements prevented optimal dispatch and forced continued generation into weak demand, pushing prices negative as renewable output remained elevated.
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.