Victoria (VIC1) experienced sustained negative pricing at −$1.10/MWh across two consecutive 5-minute intervals (15:45–15:50 on 10 July 2026), representing a minor pricing anomaly. Prices recovered to near-zero levels immediately prior and returned to positive territory afterward, indicating a transient oversupply condition.
The negative pricing occurred amid high wind generation (approximately 6,942 MW combined) and brown coal baseload (3,407 MW), creating substantial aggregate supply with limited flexible downward adjustment capacity. A binding constraint (F_TASCAP_RREG_0220) with marginal values between $3.42–$8.53/MWh was active during this period, indicating that transmission or reserve capability restrictions prevented efficient dispatch of excess generation, forcing the marginal price into negative territory to incentivise demand response or generation curtailment.
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.