Tesla boss Elon Musk has promised the world's largest lithium-ion battery to be opened in South Australia.
The battery is designed to ensure a constant power supply for the status during extreme weather events.
In Jamestown, North of Adelaide, the world's largest lithium-ion battery is officially put into use.
The Tesla energy storage system was built at the holandale wind farm in South Australia and started on Friday-
More than a month ahead of the deadline.
South Australian Prime Minister Jay Weatherill unveiled the giant battery.