VIC1 experienced sustained negative pricing at −$0.05/MWh across four consecutive intervals (11:20–11:40 on 1 July 2026), with prices alternating between zero and negative values over a seven-interval window. The minimum price of −$0.05/MWh was reached during the latter portion of this event, indicating an oversupply condition requiring financial incentives to reduce generation.
The negative pricing was driven by high wind generation (approximately 4,085–4,057 MW) combined with inflexible baseload brown coal generation (2,650 MW), creating a structural surplus that suppressed marginal pricing. Multiple binding constraints with modest marginal values ($3.44–$3.66/MWh) suggest network limitations or system security requirements were limiting export capacity and inter-regional flows, forcing VIC1 to absorb excess generation domestically and clearing at negative prices as the mechanism to balance supply and demand.
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.