SA1 experienced very high renewable penetration of 95.7% on 1 July 2026 around midday, driven predominantly by wind generation of 1,801 MW. Regional reference prices fell to negative values of -$0.10/MWh across multiple consecutive settlement intervals, indicating oversupply conditions.
The negative pricing and high renewable penetration reflect excess generation relative to local demand, with wind providing the vast majority of supply. Binding constraint F_MAIN+RREG_0220 with declining marginal values (from $10.66 to $4.65/MWh) indicates an active network or system limitation that progressively eased during the event period, suggesting that constraint relief or demand response may have helped manage the renewable surplus without requiring deeper price reductions.
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.