Australia’s largest operational BESS: Synergy completes CATL-powered 2,400MWh Collie Battery

State-owned energy company Synergy has completed the 500MW/2,400MWh Collie Battery Energy Storage System (CBESS) in Western Australia, establishing Collie as home to Australia’s largest operational battery energy storage system (BESS).

The project, located opposite the Collie Power Station, a 350MW coal-fired power station set to close in 2027, represents more than AU$1.6 billion (US$1.12 billion) in investment through Synergy.

Previous reporting on the battery storage system originally stated the CBESS capacity was 2,000MWh; however, media statements from both the Western Australian government and Synergy indicate this has been increased to 2,400MWh.

In doing so, this means that the CBESS is now, officially, Australia’s largest operational battery storage system, trumping the likes of Akaysha Energy’s 1,680MWh Waratah Super Battery and Origin Energy’s 1,770MWh Eraring Battery Stage 1, both in New South Wales, and Neoen’s own Collie Battery, sized at 2,200MWh.

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