WA1 · WEM — 30-min trading intervals
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Western Australia operates the Wholesale Electricity Market (WEM), a separate market from the NEM that covers the South West Interconnected System (SWIS). The WEM is operated by AEMO but uses 30-minute trading intervals rather than the NEM's five-minute dispatch intervals, and has a significantly lower price cap of approximately $324 per MWh compared to the NEM's $17,500 per MWh.
Gas-fired generation is the dominant fuel source in the WEM, reflecting Western Australia's abundant natural gas reserves. However, wind and solar capacity are growing steadily, and rooftop solar is increasingly influencing daytime demand patterns across the SWIS.
As the WEM is not interconnected with the NEM, Western Australia's electricity prices are determined entirely by local supply and demand dynamics, making the market particularly sensitive to gas prices, planned generation outages, and extreme weather events.