Tesla has previously said the company would commit to delivering the battery within 100 days or it will be free.
Innovative US carmaker Tesla Motors has agreed to deal with an Australian state to build the world's largest lithium ion battery.
Since September past year, the state's population of 1.7 million people have continued to suffer from frequent blackouts and power shortages.
This could be music to the ears of BHP (AU:BHP) after its Olympic Dam copper mine was hit hard by power outages towards the end of 2016 as the South Australia electricity grid failed.
Funding to build the battery will come from the South Australian government's plan - worth 550 million Australian dollars ($417 million) - to deliver affordable and clean power.
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"This will be the highest power battery system in the world by a factor of 3".
Musk said the new battery will be 100 megawatts in capacity.
While the pioneering project promises to alleviate some of SA's energy woes, the big unknown at this stage is cost. Tesla was awarded the entire energy storage system component of the project.
Tesla announced Thursday on Twitter it had won the bid for what will be "the world's largest lithium-ion battery storage project", and Musk followed suit by lauding Australia for its renewable energy focus.
Paired with Neoen's Hornsdale Wind Farm near Jamestown, South Australia, the system is created to have a storage of 129 megawatt-hours - enough to light up 30,000 homes.
As a maker of electric automobiles, Tesla has also invested heavily in energy storage and solar panel technology - and it believes its technology could develop far beyond vehicles and supply power to the grid.
Tesla also added that its Powerwall system is being installed for residential customers in the country.