WEM WA1 region experienced a major price spike to $396.54/MWh during the 06:25 trading interval on 16 June 2026, representing a 117% jump from the prior interval at $182.68/MWh. Prices had been gradually rising from $167.53/MWh over the preceding 25 minutes before the sharp escalation.
The spike occurred despite a substantial generation mix with 2,772.5 MW online across coal, gas, wind, battery and solar sources. The event was driven by multiple binding constraints with marginal values ranging from $3.00 to $5.60/MWh, indicating that dispatch flexibility was constrained across several network elements rather than by fuel scarcity or reserve inadequacy. The binding constraint with the highest marginal value (F_Q++8C_L60 at $5.60/MWh) was likely the primary driver of the price elevation, though the presence of five simultaneous binding constraints suggests network limitations across different transmission paths restricted the available generation available to serve demand.
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.