A binding network constraint identified as F_T+FARE_N-2_TG_R6 activated in the NEM, reaching a peak shadow price of $1,096.22/MWh before declining through subsequent dispatch intervals to $74.15/MWh. This constraint relates to a Tasmanian N-2 contingency scenario on the Farrell network element, likely limiting transfer capability across a critical transmission corridor. The elevated shadow price indicates AEMO's dispatch engine was significantly constrained in its ability to optimise generation dispatch across the affected region.
The F_T+FARE_N-2_TG_R6 constraint is associated with a contingency (N-2) security constraint on the Tasmanian transmission network near the Farrell substation, triggered to maintain system security under a dual-element outage scenario. The high initial shadow price of $1,096.22/MWh suggests a combination of limited available generation headroom within the constrained region and tight network thermal or voltage limits, forcing AEMO to redispatch units at significant cost. The stepwise decline in marginal values across successive dispatch intervals indicates the constraint progressively eased, potentially as generation re-dispatch, load variation, or automatic voltage regulation responses helped relieve the binding condition.
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.