TAS1 experienced sustained negative pricing at −$0.48/MWh across two intervals (18:35–18:50 on 10 July 2026), with prices oscillating between near-zero and negative levels. The event was minor in severity, with negative prices occurring in an otherwise low-price period dominated by high renewable generation.
The negative pricing reflects excess generation relative to local demand, with hydro and wind combined supplying approximately 950 MW against what appears to be lower regional consumption. Multiple binding constraints with material marginal values (F_TASCAP_RREG_0220 at $3.42/MWh and F_T+RREG_0050 at $3.04–$3.05/MWh) indicate supply was constrained by network limitations, preventing export of surplus generation and forcing the market into negative pricing to incentivise demand response or generator 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.