VIC1 experienced sustained negative pricing reaching −$0.05/MWh across 2 intervals on 7 August 2026 during the evening peak (17:25–17:50), with prices oscillating near zero. The event occurred during a period of high wind generation (approximately 2,886–2,729 MW) combined with substantial brown coal output (3,018 MW), creating a supply-demand imbalance.
The negative pricing reflects excess supply relative to local demand, with the generation mix heavily weighted towards inflexible baseload brown coal and high wind output simultaneously. Multiple binding constraints with positive marginal values (ranging from 3.43 to 6.17 $/MWh) indicate that transmission or regional regulation limits restricted the ability to export or redistribute excess generation, forcing the price mechanism to penalise further dispatch and signal the need for load absorption or generation curtailment.
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.