Tasmania experienced two consecutive intervals of negative pricing on 11 July 2026, with prices declining to -$6.16/MWh at 12:15 and -$5.40/MWh at 12:20. The region's generation mix was dominated by hydro and wind output totalling approximately 1,170–1,570 MW across the affected intervals, with no gas generation dispatched.
The negative pricing reflects an oversupply situation in TAS1 during low-demand periods, with high renewable generation (particularly hydro) unable to be economically curtailed. Binding constraint F_T+RREG_0050 was active across both intervals with marginal values between $3.05–$4.05/MWh, indicating a network or operational limit was constraining the system's ability to export surplus generation or manage internal flows, forcing the price discovery mechanism into negative territory to signal the need for demand response or generation adjustment.
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.