TAS1 experienced brief negative pricing, with the regional reference price reaching −$0.34/MWh at 19:00 on 1 August 2026, occurring across 2 intervals. Prices had been near-zero or slightly positive in the preceding intervals before declining sharply.
The negative pricing appears driven by high renewable generation, with combined hydro and wind output exceeding 1,100 MW during the event window, creating downward pressure on the marginal cost of supply. Binding constraints with marginal values in the $3.44–$3.93/MWh range (constraint_id F_I+RREG_0220 and F_TASCAP_RREG_0220) suggest physical network limitations restricted the region's ability to export excess supply, preventing prices from recovering and resulting in the need to pay down demand or curtail generation to maintain system balance.
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.