A major binding constraint (T_BLINK_TV_NGZ) in TAS1 reached an exceptionally high shadow price of $8.352 million on 27 July 2026 around 11:40 UTC, coinciding with a brief spike in regional reference price to $0.64/MWh. The constraint remained binding across multiple settlement periods whilst Tasmania's generation mix comprised approximately 3,284 MW of hydro, 739 MW of wind, and 250 MW of gas-fired capacity.
The extreme marginal value of the binding constraint T_BLINK_TV_NGZ indicates a severe physical limitation on power transfer or operational flexibility in Tasmania during this period. The high shadow price reflects scarcity value—suggesting the constraint was preventing lower-cost generation or load-balancing opportunities, with the constraint's marginal benefit reaching $8.352 million per MWh of additional capacity, which directly drove the localised price spike observed in the 11:40 settlement period.
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.