A high-value binding constraint (F_T+RREG_0050) with a marginal value of $368.14/MWh emerged in the NEM, indicating significant transmission congestion or operability limitation. This constraint was the dominant price-setter in the market, with secondary binding constraints (F_TASCAP_RREG_0220) operating at substantially lower marginal values of $7.78–$11.67/MWh.
The constraint F_T+RREG_0050 binding at $368.14 suggests a critical capacity or reliability limit was reached in the transmission network, restricting power flow and forcing dispatch adjustments. The presence of multiple concurrent binding constraints, with F_T+RREG_0050 dominating by a factor of 30–47 times the marginal value of F_TASCAP_RREG_0220, indicates that network topology or generation availability created a localised bottleneck that could not be easily relieved through alternative routing or supplementary supply.
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.