Tasmania experienced a major binding constraint event on 24 September 2026 at approximately 21:10–21:35 UTC, with constraint T_BLINK_TV_NGZ exhibiting an exceptionally high shadow price of $8.352 million. Regional electricity prices initially elevated at $135–$139/MWh before falling sharply to $56–$90/MWh, coinciding with the constraint's binding period.
The extremely high marginal value of binding constraint T_BLINK_TV_NGZ suggests severe transmission or network congestion limiting power transfer capacity during the period. Hydro generation dominated Tasmania's mix at approximately 1,000–2,000 MW across the snapshot, with supplementary gas-fired OCGT (124 MW) and wind (35–51 MW) generation; the substantial hydro contribution and potential inflexibility in hydro dispatch, combined with the network constraint, likely created a localised imbalance between supply and demand relief options. The sharp price correction downward in the 21:25–21:30 period indicates either constraint relief (through generation rebalancing or demand response) or a shift in the binding constraint hierarchy, with the constraint's persistent high shadow price reflecting fundamental limitations in available dispatch flexibility during that interval.
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.