WA1 experienced a moderate price spike to $253.22/MWh in the 21:35 trading interval on 22 June 2026, representing a $7.74/MWh increase from the previous interval. Price escalation began at 21:25 ($245.48/MWh) and continued through the spike, with prices elevated relative to the preceding baseline of approximately $213/MWh.
The price spike was driven by multiple binding network constraints with material marginal values, indicating transmission or network limitations restricted the available supply response. The constraints with the highest marginal contributions (F_Q++8C_L6 at $5.60–5.62/MWh and F_Q++8C_L60 at $5.18/MWh) together account for approximately $10.80/MWh of the total price movement, suggesting capacity restrictions prevented lower-cost generation from fully meeting demand or required dispatch of higher-cost marginal plant during the constrained interval.
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.