QLD1 experienced sustained negative pricing at approximately –$8.75/MWh across two consecutive intervals (00:20 and 00:25 on 13 August 2026). The region was generating 2,749 MW from renewable sources (solar and wind) alongside substantial coal capacity (5,644 MW) and battery storage (530 MW) during a low-demand period.
The negative pricing reflects oversupply conditions where available generation materially exceeds demand, forcing marginal generation to operate at negative prices to clear the market. Binding constraints with significant marginal values (NSA_Q_GSTONE34_250 at ~$77/MWh, and secondary constraints F_S+SETB_R1 and F_TASCAP_RREG_0220 in the $4–5/MWh range) indicate network limitations are constraining withdrawal of excess generation, exacerbating the supply-demand imbalance and driving prices into negative territory.
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.