A major constraint event occurred in Tasmania on 23 June 2026, with binding constraint T_BLINK_TV_NGZ exhibiting an exceptionally high shadow price of $7.308 million, indicating severe scarcity. Regional prices spiked to $222/MWh in multiple settlement periods, with volatile swings between $78 and $222/MWh across the 25-minute window.
The extreme marginal value of binding constraint T_BLINK_TV_NGZ ($7.308M) directly drove the high wholesale prices observed during this period. The constraint became severely binding whilst Tasmania's generation mix remained substantial at approximately 1200–1400 MW of hydro output plus modest wind and gas generation, suggesting the constraint limited power transfer or dispatch rather than absolute supply scarcity.
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.