The WEM WA1 region experienced a moderate price spike to $253.22/MWh during the 10:20 trading interval on 12 June 2026, representing a sharp 43% increase from the previous interval. The spike was short-lived, with prices rising further to $355.77/MWh in the following interval before stabilising.
The price spike was driven by binding constraints with material marginal values, particularly constraint F_T+NIL_MG_RECL_R6 (marginal value $12.64/MWh) and constraint F_T+RREG_0050 (marginal value $4.98/MWh), indicating locational or network limitations were actively constraining dispatch. The generation mix shows substantial reliance on thermal generation (black coal 1,161.51 MW and gas plant 911.35 MW combined) with battery support (395.39 MW), suggesting tight system conditions where marginal generation costs or constraint-induced scarcity pricing drove the sharp price movement within this single trading 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.