A severe binding constraint on the Basslink-Tasmania interconnector (T_BLINK_TV_NGZ) occurred during the early morning of 25 May 2026, with an exceptionally high shadow price of $7.308 million, indicating acute transmission congestion between Tasmania and Victoria. This constraint binding coincided with elevated spot prices around $103–104/MWh in TAS1 and a high-value interconnector utilisation issue limiting power flow capacity.
The constraint likely resulted from a combination of strong hydro generation in Tasmania (approximately 1,169–1,220 MW across the period) exceeding local demand, forcing excess generation toward the interconnector whilst simultaneous demand or generation patterns in Victoria restricted return capacity on Basslink. The marginal value of $7.308 million suggests the constraint was severely binding with insufficient alternative dispatch paths, forcing the market solver to accept significant economic inefficiency or pricing distortion to manage the network topology limitation.
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.