South Australia (SA1) experienced sustained negative pricing at −$6.00/MWh and −$6.25/MWh across two consecutive intervals (03:15 and 03:20 on 2026-08-07), representing a minor market event. Prices recovered to $0.43/MWh in the following interval, indicating a temporary constraint-driven imbalance.
The negative pricing coincided with high renewable generation penetration, particularly wind output at 1,003.39 MW and solar at approximately 681.70 MW combined, which created excess supply during an off-peak period. A binding constraint (F_T+RREG_0050) with marginal values between $3.81 and $4.31/MWh was active during and preceding the price collapse, suggesting physical network or regulatory limitations prevented efficient evacuation of the surplus generation, forcing prices negative to incentivise demand response and dispatch reduction.
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.