Elon Musk made an audacious bet earlier this year: he said his company would install a 100 megawatt (MW) battery system in 100 days to help South Australia beat blackout woes – or the project would be free. Not only did Tesla deliver on that promise, but the battery system actually started sending stored wind energy to the grid one day ahead of schedule.

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Tesla’s 100MW/129 megawatt-hour (MWh) Powerpack system, called the Hornsdale Power Reserve, is connected to the French company Neoen-owned Hornsdale Wind Farm, which is South Australia’s biggest renewable generator right now. The battery project can power around 30,000 homes for one hour, and was called upon a day early to help meet peak demand, dispatching around 59 MW of power.

Related: New Tesla Powerpack system to offer energy savings of 40-50%

The Powerpack project cost roughly around $50 million – and Tesla finished around 40 days before the deadline. It covers about one hectare of land and currently holds the title of the world’s biggest lithium-ion battery farm, but it won’t be long before it’s unseated by The Lyon Group’s $1 billion solar farm with 1.1 million batteries.

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South Australia announced a $550 million energy plan to help stabilize their grid shortly after Musk made his bet – including contracting for about 100 MW of energy storage. Vox pointed out while excitement for Tesla’s delivery is definitely warranted, another part of South Australia’s plan is incentivizing local natural gas and constructing a 250 MW gas-fired power plant. The state is in a sense “running a real-time competition for which can more quickly and reliably compensate for the loss of coal: renewables and storage, or natural gas,” according to Vox. South Australia’s energy plan website says the plan “will transform our energy network to provide reliable 21st century clean energy.”

+ Hornsdale Power Reserve

Via ABC News and Vox

Images via Hornsdale Power Reserve and Tesla on YouTube