Transgrid will deliver upgrades to its existing transmission lines and substations and a System Integrity Protection Scheme (SIPS) to unlock the benefits of the Waratah Super Battery (WSB).
Transmission line works will occur between substations at Bannaby and Sydney West; Yass and Marulan.
Works will occur at 22 substations throughout the network.
No newly built transmission line routes or substations are planned as part of the project.
The project will allow increased transmission of energy to meet demand in the Sydney, Newcastle, and Wollongong regions, following the reduction in supply due to the planned closure of Eraring Power Station.
It will enable the battery to operate as a part of a broader System Integrity Protection Scheme (SIPS). The SIPS is designed to monitor transmission lines and enable the battery to act as a 'shock absorber' in the event of any sudden fault on the transmission system.
The WSB is located approximately 100km north of Sydney and approximately 25km south of the retiring Eraring coal-fired power station. The battery, which is also known as a 'Battery Energy Storage System (BESS)' will reside in a 138,000 square metre site (over 8 AFL fields).
Construction of the battery commenced in June 2023 and will be completed in 2025.
Akaysha Energy has been appointed by the Energy Corporation of NSW (EnergyCo NSW) to develop the Waratah Super Battery.
More information:
NSW Govt approves construction and operation of Waratah Super Battery - Completed
Early 2023Environmental Surveys and site inspections for tranmission line and substation works - Completed
Mid 2023Transmission line and substation works start - Completed
Late 2023Transmission line and substation works complete - Completed
Mid 2025The NSW Department of Planning and Environment granted final planning approvals for the WSB in Feb 2023.
As part of the WSB enabling works, Transgrid has undertaken Special Environmental Assessments and approvals for each work activity to ensure that a high level of investigation and risk minimisation is included as part of construction works.
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05 August 2025
Transgrid has launched the largest and most innovative monitoring and control system of its kind in Australia to support one of the world’s largest grid-scale batteries, improving energy reliability and security for consumers.
18 October 2022
Transgrid and EnergyCo have signed contracts for the project that will lead to connecting the largest standby network battery in the Southern Hemisphere to the grid and ensure energy security with the pending retirement of Eraring Power Station.