Williamsdale Battery

Williamsdale Battery battery storage overview.

Williamsdale is a large battery storage installation in the Australian Capital Territory, developed under the Big Canberra Battery programme. It entered commissioning in mid-2026 and is designed to trade electricity and provide services that support the power system.In ConstructionAustralia

At a Glance

Technical capacity

262.5 MW

Energy storage

523.6 MWh

Storage duration

2 hours

Storage type

Standalone

Owners

Eku Energy Group Limited +4 more

Operator

Data coming soon

Country

Australia

Location

-35.550°, 149.150°

Website

Official project page

Ownership

5 records

Share	Organisation	Role	Details	Period
Unknown		Indirect Parent	The October 2025 licence application places the Williamsdale project within the Eku Energy ownership chain through this United Kingdom holding company.	Current / not dated
Unknown		Indirect Parent	The October 2025 licence application places the Williamsdale project within the Eku Energy ownership chain through this United Kingdom holding company.	Current / not dated
Unknown		Indirect Parent	The October 2025 licence application identifies this company, acting as trustee for Eku Energy Projects (Australia) Trust, as the owner of the Williamsdale project company.	Current / not dated
Unknown		Project Company	Trustee and licensed project company for Williamsdale BESS Project Trust, which holds the battery asset.	Current / not dated
Unknown	Williamsdale BESS Project Trust	Owner	The October 2025 licence application identifies the project trust as the holder of the Williamsdale battery asset, with Williamsdale BESS Project Co acting as trustee.	Current / not dated

Organisations

21 records

Organisations recorded as working on this asset or its project, and their role.

Organisation	Role	Details
	Revenue-sharing counterpartyOfftake Revenue	The ACT Government entered a fifteen-year revenue-sharing arrangement for Williamsdale’s participation in electricity markets.
	Energy systems research partnerResearch And Monitoring	Eku Energy funded research by ANU’s Centre for Energy Systems into utility-scale battery behaviour, energy-system outcomes and community understanding through the Williamsdale project.
	Investment in the Eku Energy groupFinance Insurance Legal	The October 2025 licence application identifies BCI as an investor in the Eku Energy group above the Williamsdale project.
	Balance of plant design and constructionEpc Balance Of Plant	CPP provides the design and construction of the balance of plant for Williamsdale.
	Balance of plant maintenance contractorOperations Maintenance	The project company contracted CPP for corrective and preventative maintenance and control of the site and equipment other than the Tesla batteries.
	Auxiliary generator engine manufacturerEquipment Supply	Genelite’s February 2026 account identifies Cummins engines in the two generators installed to support the battery’s auxiliary systems.
	Construction and operational asset managerDevelopment And Asset Management	Eku Energy Australia provides construction and operational asset management under an agreement with the Williamsdale project company.
	Project ownership chainOwnership History	The October 2025 licence application identifies this company within the ownership chain above the Williamsdale project company.
	Project ownership chainOwnership History	The October 2025 licence application identifies this company within the ownership chain above the Williamsdale project company.
	Project ownership chainOwnership History	The October 2025 licence application identifies this company within the ownership chain above the Williamsdale project company.
	Connection network and metering coordinatorGrid Connection	Evoenergy provides the Williamsdale network connection and acts as metering coordinator for the connection point.
	Auxiliary standby generation supplierEquipment Supply	Genelite supplied and supported the installation and commissioning of two Cummins-powered generators for Williamsdale’s standby auxiliary supply.
	Optimisation, trading and control-room servicesDigital Monitoring	The project company contracted Habitat Energy for asset optimisation, round-the-clock trading and control-room services, and settlement services.
	Fund management investment contextFinance Insurance Legal	The October 2025 licence application identifies a Macquarie Asset Management managed fund as an investor in the Eku Energy group.
	Project finance lenderFinance Insurance Legal	This bank participated in the financing completed for Williamsdale in November 2024.
	Project finance lenderFinance Insurance Legal	This bank participated in the financing completed for Williamsdale in November 2024.
	Battery supply and commissioning contractorEquipment Supply	The project company contracted Tesla Motors Australia for the supply and commissioning of 136 Megapack batteries.
	Long-term battery services contractorOperations Maintenance	The project company contracted Tesla Motors Australia for maintenance, control and service of the Megapack batteries over a twenty-year term from completion of commissioning.
	Project finance lenderFinance Insurance Legal	This bank participated in the financing completed for Williamsdale in November 2024.
	Project financing companyFinance Insurance Legal	The October 2025 licence application includes Williamsdale BESS Fin Co alongside the project trust in its financial-capacity disclosures.
	Licensed project trusteeProject Company And Development	Williamsdale BESS Project Co acts as trustee for the asset-holding trust and holds the electricity generation utility licence.

Supplier registration

Contact page only

How suppliers get onto this project's radar: its standing register, supplier portal or contact route.

Suppliers can direct enquiries through the project’s published contact channel or the general corporate enquiry form. The form accepts project and general enquiries.

Project contact details are published for Williamsdale, with an additional Australian corporate enquiry form for project and general enquiries.

Contact page

SourceChecked 28 Oct 2026

Capacity history

Recorded project capacity figures. Future-dated changes are shown but are not used as current capacity.

Effective	Capacity type	Capacity	Source
Current	Technical capacity	262.5 MW	AEMO July 2026 Generation Information — technical AC power

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