Wind turbines stand at the Hornsdale wind farm, operated by Neoen SAS, near Jamestown, South Australia, on Friday, Sept. 29, 2017. About half the capacity of the worlds largest lithium-ion battery project is installed at Hornsdale wind farm in South Australia, Tesla chief executive officer Elon Musk said at an event on Sept. 29. When this is done in just a few months, it will be the largest battery installation by a factor of three in the world, Musk said. Photographer: Carla Gottgens/Bloomberg via Getty Images