QLD1 experienced sustained negative pricing across three settlement intervals on 6 September 2026 at 03:15–03:35, with prices reaching −$35/MWh, driven by high solar and wind generation (approximately 2,797 MW combined) during low-demand early morning periods. The negative pricing persisted across eight intervals in the sample, with minimal variation around −$34/MWh, indicating structural over-supply in the region.
The negative prices are supported by the generation mix data showing substantial solar output (989.97 MW and 1,366.61 MW across tracked assets) and wind generation (440.62 MW) coinciding with a 3 AM settlement window when system demand is minimal. Multiple binding constraints with positive marginal values—including F_TASCAP_RREG_0220 (8.41), F_T+RREG_0050 (4.45), and F_TASCAP_LREG_0210 (3.99)—indicate that network or regulation service constraints are actively limiting the system's ability to reduce renewable generation or export excess output, forcing prices negative to incentivise demand response and constraint relaxation.
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.