The battery bank will undergo a round of testing to ensure the system is fully optimized and meets the requirement for connection to South Australia's power grid, according to a statement from the office of Premier Jay Weatherill. Tesla has completed construction of its massive 100 MW/129 MWh Powerpack system at the Neoen's Hornsdale Wind Farm near Jamestown.
Musk famously promised to build the Powerpack-based system in 100 days, but that now seems more like a savvy PR move than an actual bet.
Tesla's battery farm stores energy created from renewable sources like solar panels and wind farm, then feeds it into the national grid when demand is high.
And yes, Musk has, technically, completed the project in less than 100 days from signing on - even though by the time he'd signed the contract on September 29, he'd already finished half of it.
Musk typically stretches the deadlines for his projects, ranging from the production ramp-up for the Tesla Model 3 electric vehicle to the maiden launch for SpaceX's Falcon Heavy Rocket.
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Musk tweeted: 'Congratulations to the Tesla crew and South Australian authorities who worked so hard to get this manufactured and installed in record time!'
The state has yet to say how much it would pay for the battery, which is part of a A$510 million ($390 million) plan that includes diesel-fired generators to help keep the lights on following a string of blackouts over the past 18 months.
Musk's battery system is created to overcome one of the main obstacles to greater reliance on renewable power sources - they can store up power produced while the wind blows or sun shines, and then release it steadily to the grid later when generation stalls.
While South Australia hopes the Tesla battery will forestall further blackouts, not everyone is behind the project.
Analysts have estimated the battery should cost around $750 (US $585/£439) to $950 (US $741/£556) per kilowatt, or up to $95 million (US $74 million/ £56 million).