A binding constraint (T_BLINK_TV_NGZ) in Tasmania reached an exceptionally high shadow price of $8,352,000/MWh during the 00:10–00:35 period on 20 August 2026, causing significant price volatility with RRP ranging from $40.22 to $88.16/MWh. Tasmania's generation mix remained stable with approximately 900–1,060 MW of hydro and 340–380 MW of wind throughout the event.
The extreme marginal value on binding constraint T_BLINK_TV_NGZ indicates a severe network or transmission limitation was active and preventing market clearing at efficient levels. The constraint's shadow price dwarfed all other binding constraints in the period (which ranged from $4.63 to $4.98), suggesting this single constraint became the dominant price-setter, likely reflecting either a localised transmission bottleneck or a specialised operational requirement with very limited headroom during the settlement intervals.
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.