A severe binding constraint (T_BLINK_TV_NGZ) with an exceptionally high shadow price of $8.352 million/MWh occurred in TAS1 during the early morning of 23 July 2026, causing volatile spot prices that spiked to $11.35/MWh and $11.31/MWh in consecutive intervals. The constraint remained binding across multiple settlement periods whilst Tasmania maintained substantial generation from hydro (743–830 MW), wind (510–522 MW), and gas OCGT (124–125 MW) sources.
The extreme marginal value of the binding constraint T_BLINK_TV_NGZ indicates a severe physical or operational limitation preventing efficient power flow or system operation. The rapid price volatility and persistence of the constraint across consecutive periods, combined with the concurrent binding of secondary constraints (F_T+RREG_0050 and F_T+NIL_WF_TG_R60) with lower marginal values, suggests the primary constraint was the dominant limitation on system capability during this period.
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.