A high-severity binding constraint (T_BLINK_TV_NGZ) with an exceptional marginal value of $7,308,000/MWh became active in TAS1 on 19 June 2026 around 21:55 UTC, causing regional electricity prices to spike from ~$37–$39/MWh to $66.05/MWh before moderating. The constraint remained binding across multiple settlement intervals with secondary binding constraints also active, suggesting sustained transmission or operational limitations.
The exceptionally high shadow price on the binding constraint T_BLINK_TV_NGZ indicates severe scarcity in the quantity available for dispatch—far exceeding typical dispatch cost drivers. Tasmania's generation mix remained stable with ~1,000–1,100 MW of hydroelectric generation and ~270–320 MW of wind throughout the event, with no OCGT generation online, suggesting the constraint was not driven by inadequate generation capacity but rather by a discrete transmission or operational limit that became active during this dispatch interval.
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.