South Australia (SA1) experienced a price spike to $312.01/MWh across three consecutive five-minute intervals (00:15–00:25 on 24 June 2026), following a brief spike to $353/MWh in the preceding two intervals. The spike occurred during off-peak hours with a significant generation mix heavily weighted towards gas-fired generation (approximately 1,693 MW of OCGT and CCGT capacity) supported by solar and wind.
The binding constraint T_BLINK_TV_NGZ carried an exceptionally high marginal value of $7.308 million, indicating severe congestion or a critical system limitation that directly drove the elevated pricing. Multiple frequency regulation constraints (F_MAIN+RREG and F_MAIN+LREG variants) also bound with marginal values between $5.45 and $12.2/MWh, suggesting tight system frequency conditions and limited access to regulation services, which compressed the available generation capacity and forced dispatch of higher-cost marginal plant to manage demand in SA1.
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.