Hornsdale, Australia-Reuters-Tesla Corporation (TLSA)O) open the world's largest lithium-ion battery in time on Friday to power Australia's crumbling grid on the first day of summer, meeting Elon Musk's promise to build or provide it free of charge within 100 days. "South Australia is now ahead of the world in terms of schedulable renewable energy," state council Prime Minister Jay weserill said at the official launch of the Hornsdale wind farm owned by French private company neenTesla won construction 129 in July-With megawatt-hour batteries in South Australia, wind power is growing much faster than in other parts of the country, but has suffered a series of power outages in the past 18 months. In a political debate, opponents of the state's renewable energy push believe that in a country that still relies on fossil fuels (mainly coal), batteries are a "Hollywood solution"It's electricity thirty. However, supporters say this will help stabilize the grid, in a state where more than 40% of the electricity currently comes from wind energy, but needs help when the wind slows down. "Storage can respond in one second. It can solve these stability problems quickly without having to resort to large power plants, "said Praveen Kathpal, vice president of AES Energy (AES. N), a bidder who lost the battery. Read more: Germany removed Tesla from the subsidy list because it was too much to highlight the industry's hopes for the move --In terms of battery storage, Tesla CEO Elon Musk visited a site about 225 kilometers (141 miles) north of the capital Adelaide on July, saying the battery was "just the beginning ". The state has not yet revealed how much it will pay Tesla. Weatherill blacked out the entire state after a major storm last year and raced to shore up the state's grid for $0. 51 billion (£ 284. 6 million) plan including ordering large batteries and installing diesel-Fuel turbines. Read more: GM planSelf-scale launchDriving in AmericaS. City of 209aes's Kathpal, who is also president of the United StatesS. The Energy Storage Association says South Australia's commitment to energy storage is an important step in other sectors of the industry. "We think this will really accelerate Australia's absorption of energy storage," he said . ".