VIC1 experienced minor negative pricing in two intervals on 9 August 2026 around 05:05–05:15, with minimum spot prices touching −$0.10/MWh. Pricing recovered to near-zero levels immediately after, with the broader period characterised by low positive prices of $5–$8/MWh as wind generation remained elevated at over 3,300 MW.
The negative pricing occurred during a period of high renewable generation, particularly wind at 3,376–3,381 MW, which suppressed marginal costs. A binding constraint with marginal values declining from $8.97 to $6.76/MWh across the interval sequence indicates that constraint-driven scarcity was easing; as this binding constraint relaxed, the opportunity cost of additional generation fell into negative territory, reflecting oversupply conditions relative to dispatch requirements. The rapid price recovery to $0.01/MWh within one interval suggests the negative pricing was transient and driven by short-term supply–demand imbalance rather than structural market conditions.
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.