Hornsdale Power Reserve
| Hornsdale Power Reserve | |
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| Country | Australia |
| Coordinates | 33°05′09″S 138°31′06″E / 33.08583°S 138.51833°E |
| Status | Operational |
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Hornsdale Power Reserve is a 150 MW (194 MWh) grid-connected energy storage system owned by Neoen co-located with the Hornsdale Wind Farm in the Mid North region of South Australia, also owned by Neoen.
The original installation in 2017 was the largest lithium-ion battery in the world at 100 MW / 129 MWh. It was expanded in 2020 to 194 MWh at 150 MW. Despite the expansion, it inevitably lost that title in August 2020 to the Gateway Energy Storage in California, USA. In Australia the large Victorian Big Battery (300 MW / 450 MWh) began operations in December 2021. Those have since been leapfrogged by many other batteries.