Victoria (VIC1) experienced sustained negative pricing over a 2-interval period on 12 June 2026 around 04:00 AEST, with the Regional Reference Price (RRP) falling to approximately -$7.55/MWh. The region had substantial renewable generation (2,531 MW wind and 514 MW solar) combined with significant brown coal output (3,073 MW), creating oversupply conditions during the early morning minimum demand period.
Negative pricing resulted from excess generation relative to demand, driven by the combination of high wind and solar output during minimum system demand hours. Multiple binding constraints with modest marginal values (ranging from $3.64 to $5.35/MWh) indicate that network limitations were active but not severely constraining the market; the binding constraints suggest physical export or ramping limitations prevented efficient redistribution of the surplus generation across the NEM, leaving VIC1 unable to clear its excess supply and forcing prices negative.
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.