The WEM experienced a sharp price spike to $361.06/MWh at 10:25 AM on 3 June 2026, with prices remaining elevated between $361–$372/MWh for approximately 30 minutes. This represented a dramatic increase from the preceding baseline of ~$127–$171/MWh, suggesting a sudden supply-demand imbalance or constraint activation in the WA market.
The binding constraint F_T+NIL_MRWF_TG_R6 (likely a transmission constraint on the Muja-Rockingham-Westdale-Fremantle corridor) activated with marginal values around $113–$163/MWh, substantially driving up the regional reference price. Despite adequate total generation capacity (~3,089 MW) from a diverse fleet including black coal, gas-fired plant, and battery storage, the transmission constraint prevented efficient dispatch and forced more expensive marginal generation to set the price, creating the pronounced price spike characteristic of WEM congestion events.
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.