An anonymous reader shares a report on The Guardian: Elon Musk, the billionaire founder of electric car giant Tesla, has thrown down a challenge to the South Australian and federal governments, saying he can solve the state's energy woes within 100 days -- or he'll deliver the 100MW battery storage system for free. On Thursday, Lyndon Rive, Tesla's vice-president for energy products, told the AFR the company could install the 100-300 megawatt hours of battery storage that would be required to prevent the power shortages that have been causing price spikes and blackouts in the state. Thanks to stepped-up production out of Tesla's new Gigafactory in Nevada, he said it could be achieved within 100 days. Mike Cannon-Brookes, the Australian co-founder of Silicon Valley startup Atlassian, on Friday tweeted Elon Musk, asking if Tesla was serious about being able to install the capacity. Musk replied that the company could do it in 100 days of the contract being signed, or else provide it free, adding: "That serious enough for you?"