VIC1 experienced brief negative pricing in two consecutive intervals (16:15–16:20 on 31 August 2026), with prices reaching −$0.05/MWh, following a sharp price collapse from $10.50/MWh. The event was minor in severity and occurred amid high wind generation (approximately 5,550 MW combined) and substantial brown coal output (3,299 MW).
The negative prices align with high renewable supply coinciding with inflexible dispatchable generation, a classic oversupply condition in the NEM. The binding constraints with marginal values ranging from $3.43 to $4.38/MWh (primarily F_T+RREG_0050 and F_TASCAP_RREG_0220) suggest transmission or network service constraints were active during this period, limiting the ability to export or redistribute surplus generation and forcing the spot price downward to incentivise consumption reduction.
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.