A major binding constraint (N_QPSFB_L_9INV) with an exceptionally high shadow price of $811,961/MWh became active in NSW1 during the early morning period of 2 July 2026, causing spot prices to spike to $73/MWh. The constraint remained binding across multiple settlement periods whilst the region was operating with high renewable penetration (4,063 MW of wind and solar) and substantial coal generation (3,743 MW).
The extreme marginal value of the binding constraint N_QPSFB_L_9INV indicates a severe physical limitation in the network preventing efficient dispatch despite adequate overall generation capacity in the region. The high shadow price reflects the economic cost to the system of being unable to relieve this constraint, which would otherwise allow lower-cost generation to serve demand or constrain higher-cost generation, thereby suppressing prices toward the reference level observed before and after the constraint binding event.
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.