TAS1 experienced sustained negative pricing across 2 intervals on 11 August 2026, with the minimum price reaching -$0.10/MWh during the 16:45 settlement period. The region generated approximately 1,180-1,190 MW from wind and hydro sources during this period, with modest gas-fired generation of around 125 MW.
The negative pricing reflects an oversupply situation in TAS1 where renewable generation (predominantly wind at ~490 MW and hydro at ~200 MW) exceeded regional demand requirements. The binding constraint F_T+LREG_0050 consistently held marginal values around $88.62-$88.72/MWh across the event window, indicating system constraints were actively restricting generation dispatch; this constraint binding at high marginal values while prices turned negative suggests generators were constrained from reducing output, forcing negative 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.