HORNSDALE, Australia (Reuters) – Tesla Inc switched on the world’s biggest lithium ion battery on Friday in time to feed Australia’s shaky power grid for the first day of summer, meeting a promise by Elon Musk to build it in 100 days or give it free.

“South Australia is now leading the world in dispatchable renewable energy,” state Premier Jay Weatherill said at the official launch at the Hornsdale wind farm, owned by private French firm Neoen.

Tesla won a bid in July to build the 129-megawatt hour battery for South Australia, which expanded in wind power far quicker than the rest of the country, but has suffered a string of blackouts over the past 18 months.

In a politically charged debate, opponents of the state’s renewables push have argued that the battery is a “Hollywood solution” in a country that still relies on fossil fuels, mainly coal, for two-thirds of its electricity.

Supporters, however, say it will help stabilize the grid in a state that now gets more than 40 percent of its electricity from wind energy, but needs help when the wind dies down.

An old windmill stands in front of wind turbines in a paddock near the Hornsdale Power Reserve, featuring the world’s largest lithium ion battery made by Tesla, located on the outskirts of the South Australian town of Jamestown, in Australia, December 1, 2017. REUTERS/David Gray

“Storage can respond within a fraction of a second. It can address those stability issues very quickly without needing to resort to using large power plants,” said Praveen Kathpal, vice president of AES Energy, a losing bidder to build the battery.

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