A major binding constraint (T_BLINK_TV_NGZ) in TAS1 reached an exceptionally high shadow price of $8.352 million, causing significant volatility in regional reference prices which fluctuated between $25.12 and $35.14/MWh during the 20-minute period. The constraint became the dominant price-setter in the Tasmanian region, with its marginal value substantially exceeding other active binding constraints.
The extremely high shadow price on constraint T_BLINK_TV_NGZ indicates severe scarcity or congestion within the transmission element it governs, forcing the market to significantly restrict dispatch or accept substantial constraint violation costs. The generation mix during this period comprised approximately 1,700 MW of hydro generation, 600 MW of wind, and 250 MW of gas OCGT capacity, suggesting the constraint was limiting available generation pathways despite adequate total installed capacity, likely due to network topology or physical transmission limitations rather than generation adequacy.
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.