NSW1 experienced sustained negative pricing across two intervals during the early morning of 14 September 2026, with the minimum price reaching -$6.51/MWh at 05:30. The region's generation mix was dominated by solar (2811.8 MW) and wind (1462.47 MW) alongside substantial black coal output (3344.38 MW), creating an oversupply condition typical of low-demand periods with high renewable generation.
The negative pricing reflects excess generation relative to demand during the early morning period when solar output remains high and demand is minimal. Multiple binding constraints with significant marginal values—particularly F_T+NIL_ML_L6 ($98.67/MWh) and F_T+NIL_MRWF_TG_R6 ($71.89/MWh)—indicate that network congestion or transmission constraints were active in constraining dispatch, forcing generators (particularly inflexible coal plant at 3344.38 MW) to remain online and creating downward pressure on prices to clear the market.
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.