A major binding constraint on the Basslink interconnector (T_BLINK_TV_NGZ) manifested in Tasmania on 29 May 2026, generating an exceptionally high shadow price of $7.31 million, indicating severe congestion limiting power transfer between Tasmania and Victoria. Despite this substantial constraint value, regional reference prices remained modest at approximately $97/MWh, suggesting the constraint was effectively managing demand without triggering widespread price spikes.
The Basslink constraint likely became binding due to transmission capacity limitations during a period of imbalanced supply conditions between the two regions, with Tasmania's substantial hydro generation (~1,125–1,146 MW) unable to be fully exported to Victoria. The exceptionally high shadow price reflects the scarcity value of additional interconnector capacity and indicates that marginal generation in Victoria was significantly more expensive than the regional reference price, creating arbitrage pressure across the link that the constraint mechanism captured and managed.
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.