A major binding constraint event occurred in SA1 on 12 August 2026 at 00:20 UTC, with constraint NSA_Q_GSTONE34_250 reaching an exceptionally high shadow price of $23,108/MWh. This constraint significantly elevated the region's real-time pricing relative to the negligible wholesale rates observed in subsequent periods.
The constraint NSA_Q_GSTONE34_250 binding at a marginal value of $23,108/MWh indicates severe physical or operational congestion limiting power flow. With high wind generation (1,461 MW) and substantial solar generation (674 MW combined) during the off-peak period, the constraint likely became active due to transmission limitations preventing efficient evacuation or distribution of surplus renewable energy, forcing the dispatch algorithm to apply a substantial penalty to maintain system security.
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.