NSW1 experienced sustained negative pricing at -$8.1/MWh during the 03:30 interval on 28 August 2026, with negative prices occurring across 2 consecutive intervals in the early morning period. The negative pricing event occurred amid high solar generation (3,328 MW) and moderate wind generation (305 MW), with minimal gas-fired and no hydro or battery generation available.
The negative pricing reflects oversupply conditions in NSW1 during low-demand early morning hours, driven by high renewable output that exceeded minimum dispatchable generation requirements. Multiple binding constraints with significant marginal values indicate that network or operational limitations prevented efficient evacuation or curtailment of excess generation, forcing the market into a state where generators were required to pay to dispatch rather than receive revenue.
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.