A major binding constraint (T_BLINK_TV_NGZ) with an exceptionally high shadow price of $8.352 million was active in TAS1 on 11 August 2026 during the 09:30–09:55 period, coinciding with elevated spot prices peaking at $66.69/MWh. The constraint remained binding across multiple settlement intervals whilst Tasmania's generation mix was dominated by hydro (approximately 1100 MW) and wind (around 320–344 MW), supplemented by gas OCGT capacity.
The extreme marginal value of the T_BLINK_TV_NGZ binding constraint indicates severe scarcity in the variable it governs, suggesting physical or operational limits were preventing supply adjustments needed to relieve regional demand. The persistence of this constraint across consecutive intervals, combined with the spike in regional spot prices, points to sustained transmission or operational capacity restrictions that could not be relaxed through dispatch adjustments to available generation, thereby creating the high-value economic scarcity signal.
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.