A major binding constraint (T_BLINK_TV_NGZ) with an exceptionally high shadow price of $7.308 million occurred in TAS1 on 22 June 2026 around midnight, causing significant volatility in regional reference prices which spiked to $222.24/MWh before falling sharply to $60.24/MWh. The constraint remained active across multiple consecutive settlement intervals during a period of high hydro generation (approximately 1648–1663 MW) and minimal wind and solar output.
The extreme marginal value of the binding constraint T_BLINK_TV_NGZ indicates a severe physical or operational limitation preventing the system from meeting demand or balancing supply at that time. The sharp price spike and subsequent collapse, combined with the constraint's persistence across multiple settlement intervals and the generation mix dominated by a single fuel type (hydro at ~97% of total output), suggests the constraint was likely triggered by a supply-demand imbalance or network configuration issue that restricted available capacity during a period of concentrated generation from one source with limited flexibility from other resources.
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.