South Australia (SA1) experienced high renewable energy penetration of 85.2% during the evening settlement period of 16 September 2026, driven by substantial wind generation of 1,095.89 MW combined with solar output of 251.76 MW and battery discharge of 222.51 MW. Real-time prices ranged between $57.82/MWh and $71.78/MWh across the five-minute intervals, reflecting moderate volatility typical of high-renewable periods.
The high renewable penetration appears to have been constrained by binding constraint F_T+LREG_0050, which carried marginal values ranging from $19.48/MWh to $28.25/MWh across successive intervals, indicating supply-side regulation limitations were actively restricting renewable dispatch. Additionally, binding constraint F_T+RREG_0050 maintained a consistent marginal value of $3.70/MWh, suggesting subsidiary regulation constraints were also active; together these binding constraints support the observation that regulatory or ramp-rate requirements limited the extent to which renewable generation could be fully utilised despite its substantial availability.
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.