Tesla CEO Elon Musk’s vow to install the world’s largest lithium-ion battery storage system in South Australia within a 100-day window has been honoured, with the company has completing construction of its 100 MW/129 MWh Powerpack system at the Neoen’s Hornsdale Wind Farm near Jamestown.

First mentioned in July after Musk made a bet saying that his team could install a large-scale energy storage solution within 100 days of signing a grid connection agreement, or the entire system would be free.

Known as the world's largest gridscale battery - the Hornsdale Power Reserve battery project had already completed by more than halfway by the September 29 signing date.

According to Tesla, the Powerpack system will use renewable energy from the Hornsdale Wind Farm and deliver electricity during peak hours to help shift demand away from the South Australian grid. 

The system is expected to be online by Friday, December 1, and will eventually be able to provide enough power for more than 30,000 homes during blackout periods, says Tesla.

“The world’s largest lithium ion battery will be an important part of our energy mix, and it sends the clearest message that South Australia will be a leader renewable energy with battery storage,” says South Australian Premier Jay Weatherill.