South Australia (SA1) experienced high renewable penetration of 87.5% during the early morning period of 20 August 2026, driven predominantly by wind generation (410.78 MW) and solar generation (312.54–334.26 MW). Spot prices remained relatively subdued, ranging from $16.12 to $68.51/MWh, with most settlement periods trading in the $20–$45/MWh band.
The high renewable penetration and low-to-moderate price outcomes reflect the substantial renewable generation supply relative to demand during this overnight and early morning period. Multiple binding constraints with marginal values between $4.29 and $12.20/MWh—including F_TASCAP_RREG_0220, F_MAIN+RREG_0220, and F_T+RREG_0050—indicate that transmission or network constraints were active in limiting flows and supporting price formation, though their contribution to prices remained modest relative to the abundant renewable supply.
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.