Pictured: The world's largest lithium-ion battery has just been plugged in to the Australian state grid
Tesla has plugged the world's largest lithium-ion battery into the Australian state grid.
The project was promised by chief executive Elon Musk, who said his company would develop the 100-megawatt battery within 100 days of contracts for the project being signed at the end of September.
If the company did not, Mr Musk said he would hand the battery to the South Australia state government for free.
South Australia premier Jay Weatherill said the battery had begun dispatching power to the state grid on Thursday, providing 70 megawatts as temperatures rose above 30C (86F).
The official launch coincided with the first day of the Australian summer - the season when power usage soars due to use of air-conditioning.