South Australia (SA1) experienced high renewable penetration of 85.2% on 7 August 2026 at approximately 14:00 AEST, driven predominantly by wind generation at 1,421.64 MW. Real-time prices declined significantly over the six-minute settlement period from $88.44/MWh to $46.67/MWh, reflecting the influx of low-marginal-cost renewable supply.
The steep price decline is consistent with high wind generation suppressing spot prices during this interval. Binding constraints on F_TASCAP_RREG_0220 (marginal value up to $7.78/MWh) and F_T+RREG_0050 (marginal value $4.29/MWh) suggest network or system security limits were active, though their relatively modest shadow prices indicate they were not the primary price-setter. The renewable-driven oversupply, combined with the downward price trajectory, reflects typical dynamics when instantaneous wind output exceeds system demand requirements.
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.