LESSONS LEARNT REPORT NO.3 H1 2025 WESTERN DOWNS BESS

Summary

Australia's Western Downs Battery Energy Storage System (WDBESS), developed by Neoen with advanced grid-forming inverters, is encountering an unexpected challenge with its revenue from Frequency Control Ancillary Services (FCAS). A revised definition of inertia in national electricity rules has led to a reduction in FCAS enablement for the battery, impacting forecasted income. The project, which achieved commercial operations in May 2025 with an expanded capacity of 255MW/510MWh, is actively engaged with the market operator to address this regulatory uncertainty, while continuing to demonstrate the grid stability benefits of advanced battery technology.

Key Facts

Source Document

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