A major binding constraint (T_BLINK_TV_NGZ) in TAS1 reached an exceptionally high shadow price of $8.352 million on 5 July 2026 around 11:05 AEST, coinciding with a notable spike in the regional reference price to $90.22/MWh. The constraint remained binding throughout the observation period whilst Tasmania's generation remained dominated by hydro output (1,340–1,435 MW) with modest wind contribution (42–77 MW).
The extreme marginal value of the T_BLINK_TV_NGZ binding constraint indicates severe scarcity in the network element it represents, driving the price spike observed at 11:05. The constraint's persistent binding status across multiple settlement intervals, combined with Tasmania's heavy reliance on hydro generation and minimal dispatchable reserves (zero OCGT output), suggests the region faced transmission or operational congestion that prevented efficient power flows, forcing the market to price scarcity at a premium level.
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.