Tasmania experienced a major binding constraint event on the Blink/Tasman Video (T_BLINK_TV_NGZ) interconnector with an exceptionally high shadow price of $7.308 million, indicating severe transmission congestion limiting power flows. Regional electricity prices spiked to $108.22/MWh during the constraint period (22:45 AEST) before moderating, whilst hydro generation remained elevated at 1500+ MW across multiple settlements.
The extreme shadow price suggests the Blink interconnector reached its thermal limits during evening demand, forcing the market to constrain lower-cost Tasmanian hydro generation and accept more expensive mainland generation or local substitutes. This constraint binding is likely driven by elevated interconnector utilisation combined with import demand from mainland regions during peak evening load periods, combined with Tasmania's high hydro availability (which would otherwise export at lower marginal cost) creating a sharp price arbitrage signal that the transmission link could not accommodate.
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.