South Australia region 1 (SA1) experienced sustained negative pricing over a 35-minute period on 9 June 2026, with prices ranging from −$3.00/MWh to −$11.48/MWh across seven consecutive settlement intervals. The minimum price of −$11.48/MWh occurred at 16:45, representing the most acute pricing event during this window.
The negative pricing was driven by high wind generation (1,438.82 MW) coinciding with low demand or constrained export capacity during the late afternoon period. Multiple binding constraints with material marginal values (ranging from $3.76 to $7.45/MWh) indicate that system constraints limited the ability to dispatch excess renewable generation, forcing generators into negative pricing territory to maintain dispatch balance in the region.
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.