Guildford West’s large-scale battery to revolutionise renewable energy infrastructure
Ausconnex, part of the Endeavour Energy Group, is planning to install Battery Energy Storage Systems (BESS), across Greater Western Sydney.
A BESS captures and stores electricity from renewable and non-renewable sources in commercial sized batteries. It releases this stored power when needed to meet energy demand, including during peak periods.
This initiative supports the upgrade to the existing electricity grid through the growth of renewable energy sources and will help deliver safe, reliable, and cleaner power contributing to the NSW Government’s goal of reaching net zero emissions by 2050.
Aerial view of the Guildford West Substation and proposed HV BESS
Planned Battery Energy Storage System in Guildford West
Ausconnex is proposing a high voltage (HV) BESS which will be located on the site of the existing transmission substation at 120-130 McCredie Road, Guildford West. See aerial view image showing the conceptual overlay on the right.
Building the BESS within the existing substation site uses land that is already set aside for this purpose and avoids the need for additional transmission lines, minimising environmental impact.
The proposed HV BESS at the Guildford West substation will have a capacity to supply up to 100 megawatts of power and store 200MWh of energy.
Planning procedures
As a State Significant Development (SSD), the proposed HV BESS will require NSW Planning Minister’s approval including the preparation of an Environmental Impact Statement (EIS).
As we progress through the SSD process, a number of environmental studies will be undertaken to assess and mitigate any potential impacts during the HV BESS project’s construction and operation, in line with EIS requirements.
In preparation of the project, we will use devices called noise loggers (photo to the right) to assess background noise and noise sensitivity in the surrounding area. This will help compare noise from equipment and activities during construction and operation and determine if noise mitigation measures are needed.
Pending approval of the project construction is expected to begin in 2026 and aims to be completed by 2028. Work will take place during standard construction hours (Monday to Friday from 7am to 6pm and Saturdays from 8am to 1pm).
Photo example of a noise logger used to measure background noise level
BESS stands for Battery Energy Storage System, as it consists of one or more batteries that store electrical energy for use at a later time. This stored energy can then be drawn upon as needed, to meet various demands for power.
The proposed BESS will provide localised energy supply, support the growing demand in energy resources, and;
- Provide reliable power supply to customers now and in the future;
- Improve service reliability and provide grid support by reducing the risk of power disruptions;
- Support the energy network benefiting customers and enabling improved grid resiliency and;
- Enhance the energy sustainability ecosystem by storing excess solar generation.
A BESS, which generally looks like a set of shipping containers that are about three metres high, is comprised of four key components:
- Battery packs – a set of modules that turn chemical energy into electricity, which, in turn, make up the battery pack.
- Battery management system – BMS: Which ensures the safety of the battery system by monitoring and measuring the condition of the modules.
- Inverter or power conversion system – PCS: Which shifts the direct current ( DC ) generated by the batteries to alternating current ( AC ) that goes into the electricity grid and vice versa, allowing for charging and discharging.
- Balance of Plant – BoP: Which is the electrical equipment enabling connecting the BESS to the grid including transformers, switchgear and cables.
- Grid reliability and stabilisation – the BESS can absorb or release electrical power almost instantly, providing valuable services in balancing power supply and demand.
- Renewable energy integration – a BESS can store excess energy generated from renewable sources like solar during periods of low demand and release it during peak demand times. Ensuring a continuous and reliable supply of renewable energy even when the sun isn’t shining.
- Flexibility to dispatch energy – During natural disasters or heat waves when the grid is under stress, the BESS will be able to provide grid support, enhancing resilience to ensure the power stays on.
- Cost efficiencies – by discharging stored energy during peak demand periods, the BESS can help reduce the need for expensive peaking power plants, leading to potential cost savings for consumers on their power bills.
- Environmental benefits – by integrating renewable energy more effectively and decreasing dependence on fossil fuel-based peaking plants, BESS contributes to lower carbon emissions and a cleaner environment.
What is a BESS?
A Battery Energy Storage System – BESS – is an advanced technology that captures, stores and distributes energy from both renewable energy such as solar and wind, and non-renewable sources, making it available when needed. It supports the electricity grid by providing a reliable, efficient power supply.
What are the benefits of a BESS?
- Delivers a reliable power supply
- Improves service reliability and delivers grid support by reducing the risk of power disruptions
- Enhances grid efficiency and provides support to the grid during peak demand
- Enhances energy sustainability by storing excess solar energy for use when it’s needed
Why are we proposing a BESS at this location?
Ausconnex, part of the Endeavour Energy Group, is planning to build BESS across Western Sydney and the Illawarra region as part of its commitment to renewable energy infrastructure. Ausconnex is proposing a High Voltage (HV) at the existing substation at this site. Having the BESS located adjacent to the existing transmission substation minimises environmental impacts by co-locating energy transmission and storage infrastructure while maximising land use. The HV BESS will store energy for metropolitan Sydney and beyond, supplying the National Electricity Market (NEM) during peak demand times and support the local network, when required.
When will it be built?
The HV BESS will follow a State Significant Development (SSD) process set by the NSW Department of Planning, Housing and Infrastructure (DPHI). This process requires an Environmental Impact Statement (EIS), which looks at environmental impacts and how to reduce them. Ausconnex is involving the community and other stakeholders throughout this process. Subject to project approval, construction is planned to start in 2027.
Will the BESS generate an electric and magnetic field?
Electromagnetic Fields (EMF) are created whenever there is a difference in voltage (which forms electric fields) or when electricity flows through wires or devices (which forms magnetic fields). Construction of the BESS will follow strict Australian safety standards and guidelines, ensuring it operates safely and effectively. The EMF levels are expected to be very low and within safe limits.
To further ensure safety, we will conduct detailed assessments of the potential impacts on nearby areas and sensitive locations as part of the Environmental Impact Statement (EIS). This assessment will help us understand and mitigate any possible risks related to EMF exposure.
What are the possible fire risk of grid-scale batteries?
The design and installation of the BESS will follow Australian safety standards and comply with the Work Health and Safety Regulation 2025. An advanced Battery Management System will ensure operation is within safe limits and will be supported by an array of sensors and fire suppression systems to reduce fire risks. Full scale fire testing will be completed to ensure adequate separation between the BESS and other infrastructure. Fire & Rescue NSW will be engaged as part of developing an appropriate emergency response plan to a fire.
How much noise will the BESS generate once operational?
Once the BESS is up and running, it will meet all industry noise standards. The sound you might hear will come from normal day-to-day operation and maintenance. We’ve undertaken a Noise and Vibration Assessment which includes recommendations to reduce noise, and we’ll put measures in place to reduce impacts to the community.
Will there be a lot of noise and dust during construction?
Construction will take place on weekdays from 7am to 6pm and on Saturdays from 8am to 1pm. We’re currently assessing the noise levels from equipment and activities during construction. If the assessment shows that noise reduction measures are needed, we’ll put measures in place to help minimise any impact in the area.
Will construction take place at night?
We’ll be working during regular hours (Monday to Friday from 7am to 6pm and Saturdays from 8am to 1pm) to build the BESS. During construction, we’ll keep noise levels down as much as possible.
Will there be many heavy vehicle movements during construction?
Building the BESS will involve some heavy vehicle movements around the site. Other materials, plants, and equipment might also need heavy vehicles for delivery. Once operational, the BESS will need very little maintenance, so traffic impacts will be minimal. Before construction starts, a traffic assessment report and an application to Council will be needed if there are plans for road closures or pathway closures. During construction, traffic impacts will be managed with a Construction Environmental Management Plan (CEMP) or a Traffic Management Plan (TMP).
The proposed HV BESS, a State Significant Development, requires NSW Government approval. A Scoping Report will be submitted to the Department of Planning, Housing and Infrastructure by the end of this year. Following this, an Environmental Impact Statement will be prepared and exhibited publicly, inviting community members and stakeholders to provide feedback, expected to be in late 2025.
For more information, please contact us at:
Email: batteries@ausconnex.com.au or Phone: 1800 955 224.
Acknowledgement of Country
Ausconnex acknowledges the Traditional Custodians of country where we work – the people of the Dharug, Wiradjuri, Dharawal, Gundungarra and Yuin nations – and recognises their continuing connection to the land, waters and community. We pay our respect to them, their cultures, and to the Elders past, present and emerging.Email: batteries@ausconnex.com.au
Phone: 1800 955 224.
ABN: 39 232 846 628
