Tesla is on course to meet the 100-day deadline for full activation of the world’s largest lithium ion battery in Australia, after completing the construction of the battery on Wednesday.

The South Australia government announced the milestone. Tesla chief Elon Musk had made the 100-day pact with the government that if the technology wasn’t fully operational inside that timeframe that it would be provided for free.

Tesla won a bid in July to build the 129 MW hour battery for South Australia, the country’s most wind power-dependent state. When the grid connection deal was signed on Sept 29, Tesla was already half way through installing the battery packs.
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The Tesla Powerpacks have now been fully installed at a wind farm run by France’s Neoen, and testing is set to begin to provide grid security services in South Australia.

“While others are just talking, we are delivering our energy plan, making South Australia more self-sufficient, and providing back up power and more affordable energy for South Australians this summer,” state Premier Jay Weatherill said in a statement.

The state has yet to say how much it would pay for the battery, which is part of a A$510m plan that includes diesel-fired generators to help keep the lights on following a string of blackouts over the past 18 months.

Australia’s energy market operator has warned that power supply will be tight this summer, particularly in South Australia and neighbouring Victoria, where one of the market’s biggest coal-fired power plants was shut in March.