
The Tesla Megapack project in Western Australia is the company's largest battery project in the country and its first 4-hour battery project worldwide. The Hornsdale Power Reserve, also known as the Tesla Big Battery, is a 150 MW (194 MWh) grid-connected energy storage system in South Australia. It was the world's largest lithium-ion battery when it was installed in 2017, and it has saved South Australia tens of millions of dollars by providing grid stability and reducing the need for fuel-powered generators.
| Characteristics | Values |
|---|---|
| Name | Hornsdale Power Reserve |
| Location | South Australia |
| Capacity | 150 MW / 193.5 MWh |
| Expansion Cost | €53 million ($A82 million) |
| Expansion Funding | $A15 million from the state government, $A8 million from ARENA, and up to $A50 million in cheap loans through the Clean Energy Finance Corporation |
| Expansion Completion Date | 2 September 2020 |
| Owner and Operator | Neoen |
| Annual Revenue | $4 million |
| Estimated Annual Earnings | $18 million |
| Grid Inertia | 2,000 MegaWatt-seconds (MWs) |
| Construction Start Date | 29 September 2017 |
| Construction Completion Date | 25 November 2017 |
| Connection to Grid | 1 December 2017 |
| Construction Time | 60 days |
| Tesla Megapacks | Western Australia's largest battery |
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What You'll Learn

The Hornsdale Power Reserve
In 2017, Tesla won the contract to build the Hornsdale Power Reserve, which was completed in under 100 days, beating Elon Musk's famous wager. The original installation was the largest lithium-ion battery in the world at 129 MWh and 100 MW, costing A$90 million. In 2020, the battery was expanded to 194 MWh at 150 MW, costing €53 million ($A82 million).
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The world's biggest lithium-ion battery
In 2017, Tesla, Inc. won the contract to build the Hornsdale Power Reserve in South Australia, also known as the "Tesla Big Battery". The project was completed in 60 days, beating Elon Musk's wager of "100 days from contract signature". The Hornsdale Power Reserve was the largest lithium-ion battery in the world at the time of its installation in 2017, with a capacity of 129 MWh and 100 MW.
The battery facility, made of Tesla Power Packs, helps to stabilize the local grid and has saved South Australia millions of dollars. In 2019, grid costs were reduced by $116 million due to the operation of the Hornsdale Power Reserve. The battery has also made its owners an estimated $1,000,000 by selling power from the battery to the grid.
In 2020, the Hornsdale Power Reserve was expanded to 194 MWh at 150 MW, losing its title as the largest lithium-ion battery in the world to the Gateway Energy Storage in California, USA. Neoen, the owner of the Hornsdale Power Reserve, has since increased its capacity further to 193.5 MWh.
Tesla has also launched Megapack projects in Western Australia, which are the company's first large-scale battery projects in the region. These projects have added significant energy storage capacity to Australia's grid infrastructure.
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Tesla's contract and construction
In 2017, Tesla, Inc. won the contract to build the Hornsdale Power Reserve, a 150 MW (194 MWh) grid-connected energy storage system in South Australia. The project, also known as the Tesla big battery, was completed in 63 days, beating Elon Musk's wager of "100 days from contract signature" by a significant margin. The original installation in 2017 was the largest lithium-ion battery in the world at 129 MWh and 100 MW, costing A$90 million in capital expenses.
The Hornsdale Power Reserve is owned and operated by Neoen, a French firm, and is co-located with the Hornsdale Wind Farm in South Australia. The battery system is designed to provide backup power to 30,000 homes in the event of a blackout. It has been instrumental in stabilising the local grid and reducing costs. By the end of 2018, the Power Reserve had saved an estimated A$40 million, primarily by eliminating the need for fuel-powered peaker plants. In 2019, grid costs were further reduced by A$116 million due to the operation of the Hornsdale battery.
In 2019, Neoen announced plans to increase the battery capacity by 50%, with the expansion completed by September 2020, bringing the total capacity to 193.5 MWh. The expansion cost €53 million ($A82 million) and was funded through a combination of government funding, grants, and loans.
In 2024, Tesla secured a new $650 million contract with Neoen for the Collie Battery project in Western Australia. The project will add a second-stage battery to the Collie facility, with a total capacity of 341 MW/1363 MWh. The first stage of the project is already under construction, sized at 219 MW/877 MWh. The Collie Battery project will be built using approximately 572 Tesla Megapack batteries, making it a massive $1.1 billion project.
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The battery's impact on grid stability
The Hornsdale Power Reserve, also known as the Tesla Big Battery, has had a significant impact on grid stability in South Australia.
The battery was built to increase grid stability under adverse weather events, reducing the need for gas-fired generators to provide stability. In 2018, the Power Reserve saved an estimated A$40 million in costs, primarily by eliminating the need for fuel-powered Frequency Control Ancillary Services (FCAS). In 2019, grid costs were reduced by A$116 million due to the operation of the Hornsdale Power Reserve, with savings coming from its role in frequency and ancillary control markets, providing a faster response time compared to previous FCAS agreements.
The Hornsdale Power Reserve has also successfully demonstrated its ability to stabilise the grid during disturbances. In one instance, the battery responded to a frequency drop, injecting 7.3 MW into the grid and stabilising the system before a power station could respond. After an upgrade in 2022, the battery has 2,000 MegaWatt-seconds (MWs) of grid inertia, about 15% of the state's total grid requirement. This upgrade allows the battery to provide inertia services, which are necessary for operating a stable grid and have previously only been provided by gas or coal-fired generators.
The success of the Hornsdale Power Reserve in improving grid stability and reducing costs has made it a significant milestone in the transition to renewable energy solutions in Australia.
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Neoen's expansion plans
Neoen, a French renewable energy company and one of the world's leading independent producers of exclusively renewable energy, has been contributing to Australia's energy transition for over a decade. With a focus on solar power, wind power, and storage, the company has invested more than $7 billion in the Australian market and has over 4 GW of renewable energy assets in operation or under construction.
Hornsdale Power Reserve Expansion
In 2019, Neoen announced a $71 million ($48 million) project to expand the Hornsdale Power Reserve in South Australia, also known as the Tesla Big Battery system. The expansion would increase the capacity of the world's largest lithium-ion battery by 50%, adding an additional 50 MW/64.5 MWh of capacity. The upgraded facility will improve the stability of South Australia's power grid and support the state's goal of achieving 100% renewable energy generation in the 2030s.
Collie Battery Project
Neoen has secured financing for the Collie Battery Stage 1 project in Western Australia, a 219 MW/877 MWh 4-hour capacity battery system. The project is expected to be completed in Q4 2024 and will provide grid reliability services in Western Australia.
Western Downs Battery
Neoen has signed a 200 MW virtual battery contract with AGL Energy and will build Stage 2 of the Western Downs Battery in Queensland.
Solar Farm Projects
Neoen has secured debt financing for three solar projects in Australia, including the Numurkah Solar Farm in Victoria, the Western Downs Green Power Hub in Queensland, and the Coleambally Solar Farm in New South Wales, with a collective capacity of 777 MW.
Wind Power Projects
In addition to solar and battery projects, Neoen will also develop four wind power projects across Australia, contributing to the company's goal of reaching 10 GW of capacity in the country by 2030.
To fund these expansion plans, Neoen is considering selling a portion of its existing Australian portfolio, which includes more than 3.75 GW of solar, wind, and battery energy storage assets. The company has secured AU$1.1 billion in debt financing for its Australian projects, demonstrating its commitment to accelerating the transition to renewable energy in Australia.
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Frequently asked questions
The Tesla battery in Australia, also known as the Hornsdale Power Reserve, has a capacity of 150 MW / 193.5 MWh. It is the largest battery in Australia with grid-forming abilities.
The Tesla battery in Australia cost around $50 million to build. The battery was built by Tesla, Inc. for a capital cost of A$90 million.
The Tesla battery in Australia is used to stabilize the local grid and prevent power outages. It provides inertia services to Australia's National Electricity Market and helps to reduce network costs.








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