SA1 experienced high renewable penetration of 88.7% on 13 September 2026 at 11:05–11:30 UTC, driven primarily by wind generation of 824 MW supplemented by battery discharge of 233 MW. Regional spot prices ranged between $55.55 and $80.44/MWh across the five-minute dispatch intervals, with a notable dip to $55.55/MWh at 11:20 UTC.
The binding constraints F_TASCAP_RREG_0220 (marginal value $5.56) and F_T+RREG_0050 (marginal value $5.00) were the active limiting factors on pricing during this period, each contributing a floor to the regional reference price. The high renewable output—particularly the 824 MW wind generation—combined with the constraints' marginal values, explains the relatively moderate price levels despite oversupply conditions, as constraint-binding dispatch sets the market price rather than conventional fuel costs.
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.