SA1 experienced very high renewable penetration at 97.5% during the afternoon of 11 August 2026, driven primarily by strong wind generation (1636 MW) with minimal solar output and negligible thermal generation. Prices remained at or near zero for most of the period, with only brief spikes to $0.88/MWh, reflecting abundant renewable supply.
The high renewable penetration and low prices were driven by substantial wind generation meeting regional demand with minimal conventional generation required. Binding constraints on lower and raise regulation services (F_T+LREG_0050 with marginal value $87.66 and F_T+RREG_0050 with marginal value $5.64) indicate that regulation capacity—not energy supply—became the binding constraint in this low-demand, high-renewable scenario, explaining why prices remained near zero despite these constraints limiting additional renewable export.
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.