10 Key Insights into Australia’s Latest 400MW, Four-Hour Battery Project

Australia’s renewable energy landscape is set to receive a major boost with the federal government’s green light for a new 400 megawatt, four-hour battery project in north-east Victoria. Developed by the same team behind the country’s most powerful existing battery, this facility will be strategically placed between two solar farms to maximise efficiency and grid stability. Here are ten essential things you should know about this groundbreaking initiative.

1. Project Overview

The new battery system will have a capacity of 400 megawatts and a duration of four hours, meaning it can store and dispatch up to 1,600 megawatt-hours of electricity. It represents one of the largest long-duration battery storage projects in Australia, designed to complement the intermittent generation from the adjacent solar farms. The developer’s track record with previous large-scale batteries ensures proven reliability and expertise in delivering such complex infrastructure.

2. Strategic Location Between Solar Farms

Situated in north-east Victoria, the battery will be sandwiched between two existing solar farms, effectively creating a co-located renewable energy hub. This placement allows the battery to absorb excess solar generation during peak sun hours and release it during periods of high demand or low solar output. Such integration reduces transmission losses and enhances the overall efficiency of the renewable energy system.

3. Capacity and Duration Details

With a 400MW power rating and a four-hour storage duration, this battery can provide sustained support to the grid for extended periods. The four-hour duration is particularly valuable for shifting solar energy into the evening peak, when demand often spikes but solar generation wanes. It also helps maintain frequency control and voltage stability, critical for a reliable electricity network.

4. Federal EPBC Approval Process

The project received the green light through the federal Environment Protection and Biodiversity Conservation (EPBC) queue, marking a significant milestone. The approval process involved rigorous environmental assessments to ensure minimal impact on local ecosystems. This efficient clearance signals strong government support for large-scale energy storage as part of Australia’s clean energy transition.

5. Significance of Four-Hour Duration

Most large batteries in Australia today have a duration of one to two hours, making this four-hour project a step change in storage capability. Longer duration batteries are essential for managing renewable energy variability over extended periods, such as multiple cloudy days or sudden coal plant outages. This project sets a benchmark for future investments in long-duration storage.

6. Role in Renewable Energy Transition

By enabling greater penetration of solar and wind power, the battery will help reduce reliance on fossil fuel generation. It can absorb surplus renewable energy during low-demand periods and discharge it when needed, effectively displacing gas and coal plants. This flexibility is crucial for achieving Australia’s net-zero emissions targets by 2050.

7. Comparison to Existing Batteries

The developer already operates Australia’s most powerful battery, which likely refers to the Victorian Big Battery (300MW/450MWh). This new project surpasses that in both power (400MW) and energy capacity (1,600MWh), representing a substantial upgrade. It demonstrates the rapid scaling of battery technology and the growing confidence in storage as a grid asset.

8. Economic and Job Benefits

Construction and operation of the battery will create local jobs, including in engineering, construction, and maintenance. The project also supports regional economic development by attracting further renewable energy investments. Additionally, by stabilising wholesale electricity prices, the battery can lower power costs for businesses and households in Victoria.

9. Technology and Supplier

While specific technology partners have not been named, the battery will likely use lithium-ion chemistries, possibly from established suppliers like Tesla or Fluence. The four-hour duration may require advanced energy management systems to optimise charge/discharge cycles. The developer’s experience with large-scale installations suggests a proven and reliable technology stack.

10. Timeline and Next Steps

With EPBC approval secured, the project moves into detailed design and procurement phases. Construction is expected to begin within 12–18 months, with commercial operation targeted for 2026–2027. Key milestones include grid connection agreements, financing close, and community consultations. The battery’s success will pave the way for even larger, longer-duration storage projects nationwide.

From its strategic placement between solar farms to its four-hour duration and federal approval, this 400MW battery represents a new chapter in Australia’s energy storage story. It highlights the rapid evolution from short-duration systems to long-duration assets that can truly reshape how we use renewable energy. As construction nears, all eyes will be on north-east Victoria to see this clean energy powerhouse come to life.