Tasmania experienced sustained negative pricing of approximately $-3/MWh across two consecutive intervals (03:25 and 03:30 on 2 September 2026), representing a minor market event. Prices fell sharply from $25.24/MWh in the preceding intervals, indicating a sudden supply-demand imbalance.
The negative pricing was driven by high renewable generation (wind output around 400–433 MW and hydro around 202–216 MW) coinciding with low overnight demand, creating excess supply that could not be efficiently managed. Multiple binding constraints with a marginal value of $3.44 indicate that constraint-driven dispatch requirements were active, likely forcing the market to accept additional generation that depressed prices into negative territory to clear the system.
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.