VIC1 experienced sustained negative pricing across three consecutive intervals on 7 August 2026 at 23:10–23:20, with prices reaching −$0.10/MWh. The region had substantial renewable generation (approximately 3,445 MW of wind and solar) combined with 2,827 MW of brown coal, creating supply surplus conditions during the late evening period.
The negative pricing was driven by high renewable output coinciding with minimum demand in evening hours, forcing generators to either reduce output or accept negative prices. Binding constraints with marginal values of approximately $5.46 (constraint_id F_T+RREG_0050) and $4.99 (constraint_id F_TASCAP_RREG_0220) indicate system limitations that prevented efficient export or curtailment of excess generation, constraining the market's ability to clear surplus supply at positive prices.
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.