VIC1 experienced minor negative pricing with a minimum of -$1.97/MWh sustained across 2 intervals during the 03:20–03:25 settlement period on 25 July 2026. Prices declined from near-zero levels as high wind generation (approximately 4,254 MW combined) combined with substantial brown coal output (3,237 MW) created supply excess during low-demand overnight hours.
The negative pricing was driven by an oversupply condition where minimum dispatchable generation (brown coal) and inflexible renewable generation (wind) exceeded regional demand, preventing orderly ramping down of thermal plant. This supply surplus was compounded by multiple binding constraints with significant marginal values (ranging from $2.55–$4.05/MWh), which restricted the ability to export excess energy and forced the market to pay down consumption, resulting in the recorded negative 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.