NSW1 experienced sustained negative pricing at -$5.87/MWh and -$3.00/MWh across two consecutive intervals (01:30 and 01:35) on 5 August 2026. The region transitioned from $65/MWh pricing to negative territory over a 25-minute period, indicating a significant supply-demand imbalance.
The negative pricing reflects excess renewable generation, with solar (3,323.5 MW) and wind (900.75 MW) contributing 4,224.25 MW of the generation mix during daylight hours. Multiple binding constraints with positive marginal values—including F_TASCAP_RREG_0220 ($5/MWh), F_I+RREG_0220 ($4.08/MWh), and F_T+RREG_0050 ($3.08/MWh)—suggest that network or generation scheduling limitations prevented efficient evacuation of this surplus renewable output, forcing generators to pay for dispatch reduction to maintain system security.
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.