VIC1 experienced brief negative pricing during the early morning of 3 July 2026, with prices falling to −$0.37/MWh across 2 intervals. The event occurred during a period of high renewable generation (approximately 3,212–3,331 MW of wind and 557 MW of solar) combined with substantial brown coal baseload output (3,184 MW), creating an oversupply condition in the region.
The negative pricing reflects a supply surplus driven by the combination of high wind and solar generation alongside inflexible brown coal output during low-demand night-time hours. Multiple binding constraints with modest marginal values (ranging from $4.69 to $5.01/MWh) indicate that network limitations rather than a single dominant constraint were constraining dispatch, forcing generators to accept negative prices to maintain output or manage network security requirements.
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.