Tasmania (TAS1) experienced a moderate price spike with the spot rate rising sharply from A$110.83/MWh to A$374.26/MWh across two consecutive intervals on 19 August 2026, peaking at 23:10 UTC. This represented a 238% increase in pricing within 10 minutes.
The binding constraint F_TASCAP_RREG_0220 was active across both spike intervals with marginal values of A$7.78 and A$7.75/MWh, indicating it exerted direct upward pressure on regional pricing. The constraint remained binding in the preceding three intervals (with marginal values declining to A$4.93–A$4.96/MWh) before tightening sharply during the spike period, suggesting a deterioration in available constraint headroom coinciding with the price movement.
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.