A major binding constraint (T_BLINK_TV_NGZ) with an exceptionally high shadow price of $8.352 million per MWh became active in TAS1 during the 20:20–20:45 period on 23 September 2026. Regional spot prices declined sharply from approximately $142/MWh to $75/MWh over this six-interval window, despite the constraint's extreme marginal value.
The binding constraint T_BLINK_TV_NGZ indicates a transmission pathway or network element was severely congested, creating acute scarcity in the ability to export or route generation within Tasmania. The subsequent price collapse suggests either that the constraint relief occurred as the binding limitation eased, or that supply-side changes (including the maintained high hydro and wind output totalling approximately 2,488 MW across the snapshot periods) reduced pressure on the constrained element. The interaction between the dominant hydro generation base and the binding constraint's extreme marginal value indicates generation dispatch was significantly limited by network topology rather than fuel availability.
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.