South Australia (SA1) experienced high renewable penetration of 95.4% during the evening of 23 August 2026, driven predominantly by wind generation of 968.59 MW alongside battery output of 207.1 MW combined. Regional prices exhibited high volatility during this period, with rapid fluctuations between $55.68/MWh and $156.10/MWh across five-minute settlement intervals.
The binding constraint F_TASCAP_RREG_0220 with marginal values ranging from $4.96 to $5.48/MWh indicates transmission or network limitations were active during this period, likely constraining the export of excess renewable generation from SA1. The substantial wind output combined with battery discharging created downward price pressure on renewable-weighted intervals, whilst constraint binding periods drove rapid price spikes to $155+/MWh, explaining the volatility pattern observed in the settlement price sequence.
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.