The Hornsdale Power Reserve is a facility comprising of a 100MW/129MWh Tesla Powerpack system located approximately 15km north of Jamestown in South Australia.

‘Strengthening the South Australian grid’

The aim of this project is to provide a world-leading battery storage facility to stabilise the South Australian electricity grid, facilitate integration of renewable energy in the State and assist in preventing load-shedding events.

Tesla Powerpack fast ramping capability means that it can dispatch large amounts of power quickly and reliably. This means it can support the South Australian electricity grid by providing frequency control and short-term network security services.

‘Dispatchable renewable power’

A portion of the battery will also be dedicated to trading on the electricity market. This capacity will be used to store power from the Hornsdale Wind Farm when demand is low and dispatch it when demand is high, reducing the need for expensive gas ‘peaking plants’ and placing downward pressure on power prices for South Australian consumers.

At 100MW/129MWh, the Hornsdale Power Reserve is the largest lithium-ion battery in the world. When dispatching at peak output, the battery provides enough electricity to power the equivalent of 30,000 homes.

‘Project completed on December 1’

The Hornsdale Power Reserve is operational since December 1, 2017. This Australian record-setting timeline was achieved to ensure that the battery was available during the 2017 peak demand summer season.

Site selection

Neoen  determined that the Hornsdale Wind Farm and nearby Mount Lock Substation would be an excellent site for a large-scale storage facility in early 2017. The Power Reserve was selected out of over 90 proposals in June 2017.

Some of the numerous benefits offered by the Hornsdale site are:

  • Supportive landholders;
  • Established relationship between Neoen and the local Jamestown community;
  • Suitable land in terms of:
    • topography;
    • land area;
    • land zoning;
    • geology;
    • hydrology including flooding risk; and
    • access to the site.
    • Low environmental impact due to location on agricultural land with limited ecological value.
  • Pre-existing substation infrastructure;
  • Strong, reliable grid connection via a 275kV transmission line;
  • Coupling with the Hornsdale Wind Farm to provide highly cost-effective battery charging.


Neoen lodged an application for State sponsorship of the project under section 49 of the Development Act 1993 (SA) in April 2017. However, on 22 June 2017, the Development Regulations were amended such that battery storage facilities no longer require development approval in South Australia provided they are endorsed by a State Agency and constructed on a site that has been notified in the Government Gazette by the Planning Minister. The Hornsdale Power Reserve fulfilled both of these requirements in August 2017 and qualified for exemption from Development Approval.

Site Location and Preliminary Layout

The Hornsdale Power Reserve site comprises up around 2 hectares of private freehold land leased by Neoen from local landholders. The battery itself requires less than a hectare.

Electrical Connection

The electricity dispatched from the Hornsdale Power Reserve will be transmitted via underground cabling to the Mount Lock Substation, located only 100 meters from the battery equipment.

Electrical infrastructure works will be performed by South Australian contractor Consolidated Power Projects (CPP), who also carried out the electrical works on the Hornsdale Wind Farm and was thus highly familiar with the site and substation.

Once power reaches the substation, it is dispatched into the South Australian grid (and the National Electricity Market, or NEM) via the existing 275kV transmission line.

Comments (2)

  • Megatrends, Solar Trains and World’s Largest Battery | Mapped It Reply

    […] details of the scheme can be reviewed on the Hornsdale Power Reserve web site. This is an example of how renewable power can be used to store power, in this case from the […]

    December 30, 2017 at 12:00 am
  • Paul Caulfield Reply

    Your notes say that the Hornsdale battery can supply 30,000 households at peak output. For what period of time would this supply last in any one episode?
    In any given blackout occurrence, industry and municipalities will also require emergency energy supply, so how long would the power from this battery ‘keep the lights’ across all areas of need across South Australia?

    April 19, 2019 at 2:09 pm

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