SA1 experienced sustained negative pricing of −$2/MWh across two consecutive intervals (23:15–23:20 on 13 June 2026), following a sharp price spike to $46.92 in the preceding interval. The negative pricing occurred within a generation environment dominated by wind (1,198.68 MW) and gas generation, alongside moderate solar and battery contributions.
The negative pricing reflects over-supply relative to demand in SA1, likely driven by high wind generation coinciding with evening demand decline. Multiple binding constraints with material marginal values (F_MAIN+RREG_0220 at $10.98, F_T+NIL_CHWF_TG_R6 at $5.27, and others) indicate transmission or regional frequency regulation limits prevented efficient dispatch of excess generation out of the region, forcing generators into negative pricing to remain dispatched.
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.