South Australia (SA1) experienced high renewable penetration of 85.0% during the evening of 18 July 2026, driven predominantly by wind generation of 1,083 MW. Regional reference prices remained moderate, ranging from $54.02–$60.45/MWh across the six consecutive five-minute settlement periods.
Wind generation dominated the supply mix, displacing conventional thermal capacity and reducing marginal costs. The binding constraint F_T+RREG_0050 with a marginal value of $3.69/MWh indicates that a system-level operational limit was active and contributing to price formation, though renewable abundance kept overall prices subdued relative to periods of lower renewable 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.