A major binding constraint (T_BLINK_TV_NGZ) emerged in TAS1 during the early morning of 23 June 2026, with an exceptionally high shadow price of $7,308,000/MWh. Tasmania's generation mix was dominated by hydro (approximately 3,464 MW combined) and wind (455 MW combined), with RRP remaining moderate in the $78–80/MWh range across the settlement intervals.
The extreme marginal value on the binding constraint T_BLINK_TV_NGZ indicates a severe physical or operational limitation in the transmission network that prevented dispatch optimisation, despite relatively stable regional pricing. The constraint's dominance over secondary binding constraints (which ranged from $3.71 to $10.73/MWh) suggests a localised transmission bottleneck or flow restriction was preventing the efficient allocation of Tasmania's substantial hydro and wind generation, forcing the market to accept a severe economic loss that manifested in the constraint's shadow price rather than in spot price elevation.
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.