Spanish energy giant Iberdrola has lodged plans for a 1,000 MW (4,000 MWh) battery energy storage system at a remote cattle grazing site that serves as a critical node in the state's electricity grid. The company is also exploring the addition of a neighboring wind farm to complement the project.
The battery, one of the largest proposed in Australia, is now queued for federal environmental approval under the Environment Protection and Biodiversity Conservation Act – the so-called 'green tick' required for major developments.
'This project represents a significant step in grid-scale storage, particularly at a location that is already a key transmission hub,' said Dr. Emily Tran, an energy systems analyst at the Australian National University. 'Combined with potential wind generation, it could provide firm, dispatchable renewable energy around the clock.'
Background
The proposed site is a cattle grazing property that also hosts high-voltage transmission infrastructure, making it ideal for large-scale battery installation. Iberdrola already operates the nearby 200 MW Port Augusta Renewable Energy Park, a solar and wind hybrid facility.
Federal environmental approval is the next major regulatory hurdle. The battery's capacity—enough to power hundreds of thousands of homes for several hours—would rank it among the largest in the world if built.
What This Means
The project underscores the accelerating shift toward storage as a backbone of renewable energy grids. 'Batteries at this scale can smooth out the variability of solar and wind, reducing the need for gas peaker plants,' said James Callaghan, a former grid operator now consulting on energy transition.
If the adjacent wind farm proceeds, the combined output could supply consistent power even during periods of low sun or calm wind. The development also aligns with state and federal targets for 82% renewable electricity by 2030.
Iberdrola declined to comment on the timeline, but industry sources expect a decision from the federal regulator within six to twelve months. The company has not yet disclosed the estimated capital cost.