QLD1 experienced two intervals of negative pricing on 12 July 2026 at 00:30 and 00:35, with minimum price reaching −$1.49/MWh. The negative pricing occurred during the early morning period with high solar and coal generation (approximately 5,237 MW and 3,513 MW respectively) and low demand conditions typical of overnight/early dawn.
The negative pricing was driven by excess supply relative to demand, typical of high renewable penetration during low-demand periods. Binding constraints with marginal values between $3.07 and $4.67 indicate that network or system security constraints were active, forcing dispatch of inflexible thermal generation (black coal) that could not be economically backed down, 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.