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Elon Musk promised to have the job done in 100 days or it's free. Well, it looks like Australia will be paying up. Tesla has completed installation of the world's biggest lithium ion battery in South Australia and will be turning it on next week, ahead of a Dec. 1 deadline, reports the Guardian

The 100-megawatt battery is connected to a wind farm run by French company Neoen and will store renewable energy in an effort to prevent blackouts like those that have affected the country's "most wind power-dependent state" over the last year, per Reuters. South Australia Premier Jay Weatherill says it still needs to undergo testing but will be ready for Australia's summer, which officially begins on Dec. 1.

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