TAS1 experienced sustained negative pricing over an 8-interval period from 04:50 to 05:20 on 3 August 2026, with prices reaching a minimum of –$6.96/MWh. The negative pricing persisted despite a diverse generation mix including substantial hydro (475–556 MW), wind (91–174 MW), and gas-fired generation (124 MW).
The binding constraints F_TASCAP_LREG_0210 and F_TASCAP_RREG_0220 with positive marginal values (3.47–7.38) indicate physical transmission or capacity limitations restricted the region's ability to export excess generation, forcing local supply to bid into negative territory to maintain balance. The high hydro and wind output during low-demand early morning hours exacerbated over-supply conditions, with dispatch unable to be reduced quickly or exported efficiently due to the active constraints.
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.