VIC1 experienced sustained negative pricing of −$0.1/MWh across two consecutive intervals (04:55–05:00) on 4 June 2026, with an earlier dip to −$15.41/MWh at 04:40. The event occurred during early morning periods when wind generation exceeded 7 GW across the region, contributing to oversupply conditions.
High renewable generation (wind at ~7.1 GW combined across reporting units, plus solar at 173 MW) during low demand periods created excess supply that could not be economically absorbed. Multiple binding constraints—including F_T+NIL_MG_RECL_R6 with a marginal value of $193.87/MWh and several TBTU constraints—restricted the ability to export surplus generation, forcing the dispatch stack into negative pricing to incentivise demand response and curtailment rather than physical rejection of renewable output.
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.