The WEM experienced a moderate price spike in WA1 on 10 June 2026, with the regional reference price reaching $250.65/MWh during the 05:40 trading interval. Prices had elevated sharply to $247.36/MWh in the preceding interval and remained near that level before ticking slightly higher at the spike.
The price elevation was driven by binding constraints, with constraint F_T+NIL_MRWF_TG_R6 dominating the marginal value stack at $156.88/MWh and contributing materially to the spike magnitude. The constraint remained binding across multiple intervals, suggesting a persistent transmission or network limitation that forced more expensive generation into service to meet demand during the early morning period.
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.