Elon Musk is following through on his promise to solve an energy crisis in Australia. From a report: His electric car company, Tesla, has teamed up with a French renewable energy firm and an Australian state government to install the world's largest lithium ion battery. Paired up with a wind farm in the state of South Australia, the battery will be three times more powerful than the next biggest in the world, Musk said at a news conference in the city of Adelaide on Friday. "If South Australia's willing to take a big risk, then so are we," he said. The announcement comes after billionaire entrepreneur Mike Cannon-Brookes threw down the gauntlet to Musk in March, asking if Tesla was serious when it claimed it could quickly end blackouts in South Australia. "Tesla will get the system installed and working 100 days from contract signature or it is free. That serious enough for you?" Musk wrote on Twitter at the time.