SA1 experienced sustained negative pricing on 12 June 2026 during the early morning period (06:25–07:00), with three intervals reaching approximately −7/MWh and peak negative prices exceeding −15/MWh. The generation mix was dominated by wind (1,335.72 MW) and solar (48.35 MW combined), with minimal conventional generation and battery output.
Negative pricing occurred when high renewable generation, particularly wind output, exceeded regional demand and export capacity, forcing generators to pay for dispatch. The binding constraints with high marginal values (F_T+NIL_MG_RECL_R6 reaching 132.89 and F_T+RREG_0050 at 12.19) indicate that network or reserve constraints were active during this period, limiting the region's ability to export excess renewable generation and thereby exacerbating local oversupply.
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.