South Australia recorded a very high renewable penetration of 96.05% during the late evening period on 13 May 2026, driven predominantly by wind generation (781.71 MW) supplemented by solar (386.98 MW combined) and small battery contributions. Spot prices remained relatively modest, ranging between approximately $23.57 and $35.72/MWh across the observed dispatch intervals, indicating the grid was managing the high renewable share without significant stress. A minimal gas presence (primarily OCGT at 143.96 MW and CCGT at 43 MW) provided stabilising capacity.
The high renewable penetration was primarily driven by strong wind output, which is characteristic of SA's resource profile during autumn evenings when demand is moderate and wind conditions are favourable. The binding raise regulation constraints (F_MAIN++RREG_0220 and F_T+RREG_0050) with positive marginal values suggest that frequency regulation services were under some pressure, likely a consequence of the low synchronous generation fleet online — a common challenge with very high instantaneous renewable penetration. Gas OCGT units appear to have been dispatched partly to satisfy these regulation requirements and provide system strength, rather than purely for energy, which explains why prices remained broadly stable despite the near-total renewable energy mix.
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.