A major binding constraint (T_BLINK_TV_NGZ) with an exceptionally high shadow price of $7,308,000/MWh activated in Tasmania on 29 June 2026 around 08:00 AEST, causing a brief price spike to $87.15/MWh before prices moderated. The constraint remained binding across multiple settlement periods whilst the region maintained substantial hydro generation (approximately 1,100–1,200 MW) and moderate wind output (267–282 MW).
The extreme marginal value of the T_BLINK_TV_NGZ binding constraint indicates severe transmission limitation preventing energy flows through a critical network element. The persistence of this constraint despite adequate generation capacity and the absence of gas-fired generation suggests the network element was physically saturated or thermally limited, forcing dispatch to absorb the scarcity rent rather than resolve the bottleneck through supply-side adjustment, thereby driving the constraint's shadow price to peak economic penalty levels.
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.