NSW1 experienced sustained negative pricing, reaching -$5.89/MWh over two consecutive 5-minute intervals (22:05 and 22:10 on 2 September 2026). The region had high renewable generation (solar 2644.64 MW, wind 1564.37 MW) coinciding with moderate coal output (3012.30 MW), creating structural oversupply conditions.
The negative pricing was driven by binding constraints with positive marginal values, indicating that constraint limitations prevented adequate export or withdrawal of surplus generation. High-magnitude marginal values on multiple binding constraints (up to $7.34/MWh) suggest physical network limitations were forcing the dispatch stack to accept negative prices to balance supply and demand within constrained corridors, typical of periods where renewable generation exceeds regional demand and interconnector capacity.
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.