SA1 experienced sustained negative pricing with the minimum price reaching -$101.02/MWh during the 05:15 interval on 13 July 2026, persisting across 2 consecutive intervals. The region's generation was dominated by renewable sources, comprising approximately 1,322 MW of wind and 342 MW of solar output, alongside minimal conventional generation.
The severe negative pricing was driven by excess renewable generation that could not be economically absorbed within the region, compounded by binding constraints with marginal values indicating supply management limitations. The predominance of wind generation (979 MW) during an off-peak morning period, combined with solar output (342 MW), created a structural oversupply situation where the market required negative prices to incentivise load absorption and curtailment, with multiple binding constraints (F_TASCAP_RREG_0220 and F_T+RREG_0050) reinforcing these dispatch limitations.
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.