VIC1 experienced sustained negative pricing averaging around -6.7/MWh across 8 consecutive intervals from 16:55 to 17:30 on 1 July 2026, with the minimum price reaching -6.91/MWh. The negative pricing occurred during a period of high wind generation (approximately 3,200 MW) combined with substantial brown coal output (2,867 MW), resulting in oversupply relative to demand.
The negative pricing was driven by high renewable generation that could not be economically curtailed, forcing price-setting generators to accept negative prices to remain dispatched. Binding constraints with marginal values of 4.54–6.8/MWh (F_MAIN+RREG_0220 and F_T+RREG_0050) indicate transmission or network service limitations were active in setting the regional reference price, preventing efficient export or load management to resolve the local oversupply condition.
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.