NSW1 experienced sustained negative pricing on 4 July 2026 at 04:30–04:35 UTC, with the region electronic settlement record (RRP) reaching −$5.83/MWh. This followed a sharp price decline from around $10/MWh in the preceding intervals, suggesting rapid oversupply conditions in the region.
The negative pricing occurred during high solar generation (2,239 MW) and substantial wind generation (641 MW) in a low-demand pre-dawn period, creating excess supply that could not be immediately absorbed. The binding constraint with a marginal value near $50/MWh indicates a physical network limitation was active, preventing efficient export of surplus renewable energy and forcing the market price into negative territory to incentivise demand response or generation curtailment.
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.