South Australia (SA1) experienced high renewable penetration of 87.7% during the early morning period of 25 September 2026, with wind and solar generation dominating the supply mix at 513.3 MW combined. Regional reference prices declined from 65.2 $/MWh to 41.2 $/MWh over the six settlement intervals, reflecting the increased renewable supply.
The price decline correlates with rising renewable generation, particularly wind output of 277.3 MW alongside solar generation of 236–256 MW, which collectively met most of regional demand. A binding constraint (F_T+LREG_0050) with a marginal value of $232,000 indicates an active limitation on regional raise frequency control ancillary services, suggesting that increased renewable variability required heightened constraint management; the lower but persistent marginal values on F_T+RREG_0050 indicate ongoing pressure on lower regulation services, both consistent with high renewable penetration during low-demand hours.
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.