TAS1 experienced sustained negative pricing at approximately $-7/MWh across two consecutive intervals on 27 July 2026 at 17:20–17:25. The region's generation mix was dominated by wind (around 460 MW) and hydro (approximately 170 MW), with modest gas-fired generation (~124 MW), creating an oversupply condition.
The negative pricing reflects a constraint-driven dispatch environment where binding constraint F_T+LREG_0050 exhibited marginal values of $7.16–$7.30/MWh across the affected intervals. This binding constraint prevented the region from reducing output further despite low demand, forcing generation to persist and prices into negative territory as the marginal cost of dispatch management exceeded the value of electricity.
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.