The Role of Battery Energy Storage in Australia's Energy Transition
From the Waratah Super Battery to the Eraring BESS beside a retiring coal plant, grid batteries are reshaping what a reliable network looks like.
Grid-scale batteries have moved from novelty to necessity faster than almost any other piece of energy infrastructure. In my series I examined two of the most significant Australian examples in engineering depth, and together they show what batteries are for — and what they are not.
Speed, not endurance
The Waratah Super Battery on the NSW Central Coast is, at 850 MW / 1,680 MWh, among the most powerful instantaneous-discharge batteries in the world. Its job is to act as a shock absorber: when a fault or sudden demand swing threatens the network, it injects or absorbs power in milliseconds, buying time for slower resources to respond. My assessment looked closely at its Tesla Megapack architecture and at a 2025 transformer failure, because resilience is proven by how a system handles faults, not by how it runs on a good day.
Batteries beside the coal they replace
The Eraring Battery Energy Storage System is being built next to Australia's largest coal plant and is set to become the Southern Hemisphere's largest battery at 700 MW / 3,160 MWh. That siting is symbolically and practically important: the same grid connection that once carried coal-fired power can carry stored renewable energy instead. My review proposes capacity expansion, AI optimisation, solar co-location, grid-forming inverters and hydrogen storage, benchmarked against South Australia's Hornsdale Power Reserve — the project that first proved the model at scale.
A battery does not generate energy. It generates flexibility — and flexibility is what a high-renewables grid runs short of first.
The lifecycle question
Responsible storage cannot stop at installation. Cell chemistry, second-life use and end-of-life recovery all belong in the analysis, which is why I frame battery deployment against SDG 12 as well as SDG 7. A storage fleet that solves a grid problem while creating a materials problem has only moved the cost, not removed it. The engineering task is to design for the whole life of the asset from the start.
Article theme
Grid flexibility, resilience and responsible lifecycle management