South Australia (SA1) experienced a moderate price spike with spot prices reaching $310.12/MWh in the 01:50 interval on 22 June 2026, elevated again to $305.56/MWh in the following interval. This represented a sharp rise from the $203.72–$270.65 range observed in the preceding two hours, with the spike occurring during daylight hours when solar generation was substantial at approximately 341–347 MW.
The binding constraint F_T+RREG_0050 with marginal values ranging from $123.04 to $170.94/MWh was the primary driver of the price elevation across both spike intervals. Whilst gas-fired generation (OCGT and CCGT combined) contributed over 1,000 MW to the SA1 generation mix, the active constraint on dispatch capability appears to have limited the ability to meet demand or manage reserve requirements, pushing the region up the offer stack and into higher-cost 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.