QLD1 experienced two intervals of minor negative pricing at −$2.98/MWh on 13 September 2026 at 21:55 and 22:05, with prices at $0/MWh in surrounding intervals. The region had substantial solar and wind generation totalling approximately 5,528 MW alongside baseload coal capacity, creating an oversupply condition during evening shoulder demand.
The negative prices reflect demand-supply imbalance requiring downward price pressure to manage excess generation during low demand periods. Multiple binding constraints with material marginal values indicate network or system service limitations restricting export or generator flexibility, with constraint T_BLINK_TV_NGZ exhibiting a particularly high marginal value of $8.35M, suggesting severe congestion or system strength constraints forced local generation retention and pricing down to clear the market.
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.