South Australia (SA1) experienced sustained negative pricing from 00:10 to 00:45 on 2 August 2026, with prices falling to approximately −$7/MWh across three consecutive intervals. The region had substantial renewable generation, particularly wind (1036 MW) and solar (371 MW combined), contributing to oversupply conditions during the overnight period.
The negative pricing reflects an excess generation scenario typical of high renewable penetration during low-demand periods. A binding constraint (F_TASCAP_RREG_0220) with marginal values ranging from $4.66 to $6.81/MWh indicates systemic congestion or network limitations that restricted the region's ability to export surplus generation, forcing generators to accept negative prices rather than curtail output.
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.