A critical binding constraint (T_BLINK_TV_NGZ) in TAS1 reached an exceptionally high shadow price of $8.352 million during the morning period of 12 September 2026, whilst regional electricity prices remained modest at approximately $85/MWh. This extremely high marginal value relative to the flat spot price indicates a severe operational tightness in the constraint equation.
The binding constraint T_BLINK_TV_NGZ with a marginal value substantially exceeding the region's energy price suggests that a specific network or operational limit is binding tightly against demand or supply requirements, creating a large wedge between the constraint's cost and the spot price. The generation mix during this period was dominated by hydroelectric output (approximately 2,687 MW across multiple units) with minimal wind contribution and moderate gas-fired generation, indicating that either the constraint is preventing fuller utilisation of available generation or that the physical limit represents a significant bottleneck relative to the underlying supply-demand balance.
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.