A major binding constraint (T_BLINK_TV_NGZ) with an exceptionally high shadow price of $8.352 million occurred in TAS1 on 22 September 2026 at 20:45 UTC, causing regional pricing to spike to $108.64/MWh before declining over the following 25 minutes. The constraint remained binding throughout the period, with secondary constraints also active, indicating persistent transmission limitations.
The extraordinarily high marginal value of the T_BLINK_TV_NGZ binding constraint indicates severe physical or operational limits restricting power flows in Tasmania during this period. With substantial hydro generation (approximately 3,675 MW combined across multiple hydro units) comprising the dominant supply source alongside 230–200 MW of gas-fired generation, the binding constraint likely reflects transmission capacity restrictions preventing efficient energy dispatch or export from the region, resulting in the acute price spike that subsequently moderated as demand or generation conditions shifted.
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.