VIC1 experienced negative pricing at -$4.7/MWh and -$1.1/MWh across two consecutive five-minute intervals on 2 July 2026 around midday. The negative prices occurred in a market context of very high wind generation (approximately 8,422 MW combined) and moderate brown coal output (3,255 MW), with minimal dispatchable gas capacity online.
The negative pricing reflects a structural oversupply condition driven by high intermittent generation that could not be economically absorbed in the region. Multiple binding constraints with positive marginal values (ranging from $3.43 to $7.25/MWh) indicate that transmission or network limits prevented efficient export of excess renewable generation, forcing the market into a surplus position where generators competed to avoid curtailment by accepting negative prices to remain dispatched.
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.