TAS1 experienced brief negative pricing for 2 consecutive intervals (12:55–13:00 on 13 July 2026), with prices reaching −$0.25/MWh. The event occurred during a period of high renewable generation (hydro and wind combined exceeded 2,000 MW) with minimal conventional capacity online.
The negative pricing reflects oversupply of generation relative to local demand, with high hydro and wind output (approximately 1,075 MW hydro and 514 MW wind in the final interval) meeting a reduced demand profile. Binding constraints with significant marginal values, particularly the constraint with $49.99/MWh shadow price, indicate network or operational limits were active and constraining dispatch, forcing generators to accept negative prices to maintain output when unable to export efficiently or reduce generation in response to the supply–demand imbalance.
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.