SA1 experienced brief negative pricing at -$0.1/MWh across two intervals (23:15 and 23:30–23:35 on 18 June 2026), representing a minor market event. The negative pricing occurred within a broader pattern of low to moderate prices, with RRP ranging from -$0.1 to $10.59/MWh across the observation window.
The negative pricing coincided with high renewable generation, particularly 1,516.82 MW of wind and 186.35 MW of combined solar output, which likely created local oversupply conditions in SA1. Multiple binding constraints with marginal values of $5.73 (constraint_ids: F_Q++8C_L6 and F_Q++8C_L60) indicate network congestion or export limitations were active, preventing efficient dispatch of excess renewable supply and forcing the region to accept negative pricing to clear the market.
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.