Tasmania experienced minor negative pricing at −$3.70/MWh during a single interval at 05:00 on 26 August 2026, with prices briefly dipping negative again to −$0.96/MWh in the following interval. This followed a price decay from $20.27/MWh in the preceding interval, suggesting rapid supply–demand rebalancing in the early morning period.
The negative pricing occurred during a period of substantial renewable generation, with combined hydro and wind output around 1,190 MW, alongside OCGT generation of approximately 124 MW. Multiple binding constraints with non-zero marginal values (notably F_T+LREG_0050 at $36.96/MWh and F_TASCAP_LREG_0210 at $12.47/MWh) indicate network or operational limitations prevented efficient export or management of excess generation, forcing prices negative to incentivise demand absorption and manage surplus supply within the region.
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.