Elon Musk looks to have delivered on his promise to build the biggest lithium ion battery in the world in an effort to help South Australia with its crippling energy problems. "100 days from contract signature or it's free," Musk tweeted at the time, in a deal initially negotiated over Twitter. Musk is well ahead of schedule (a rarity for Tesla!), with the 100MW battery set to be energised and tested in the coming days, according to a press release from the local state government.

Tesla Powerpacks have been installed and connected at Neoen's Hornsdale windfarm, north of Adelaide, and battery tests will be run to ensure local regulatory requirements are met before it begins operating on December 1st. South Australia suffered a state wide blackout last September, which sparked a highly politicized national debate about energy security.