BBC:

The 100-megawatt battery, built by Tesla, was officially activated on Friday. It had in fact provided some power since Thursday due to demand caused by local hot weather.

South Australia has been crippled by electricity problems in recent times.

As I understand it, the region is a leader in wind-power, but suffers blackouts when wind levels fall too far.

Elon Musk stepped in, said he’d have a 100 Megawatt backup battery built, delivered, installed and working within 100 days or he wouldn’t charge them a penny.

Great story.