TAS1 experienced sustained negative pricing, with two consecutive intervals settling at −$0/MWh (−$0.04 and −$0.05/MWh) on 31 August 2026 around 16:15–16:20. This followed a sharp price collapse from $9.30/MWh to $0/MWh in the preceding interval, before prices recovered to $11.51–$15.04/MWh in surrounding periods.
The negative pricing reflects an excess generation situation in TAS1, with combined hydro and wind output totalling approximately 930–1,130 MW during the event window. Multiple binding constraints with positive marginal values (ranging from $3.43–$4.38/MWh) indicate that transmission or regional security limitations prevented efficient dispatch of this surplus generation, forcing the market price negative to incentivise load or suppress further generation supply.
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.