With a flip of a switch, the world's largest battery is on.

Tesla officially delivered the world's largest battery energy storage system of 100 MW/129 MWh in South Australia within the deadline of 100 days (since signing the deal) after a week long of tests.

Well, the 100 day challenge was a tricky one, so Tesla began before it even signed the deal (you know, just in case):

"When the grid connection deal was signed on Sept 29, Tesla was already half way through installing the battery packs."

The ESS is installed at the Neoen’s Hornsdale Wind Farm near Jamestown. The farm has 99 3 MW turbines out of 105 planned (315 MW).

The capability of Tesla energy storage is three times that of the second largest ESS.

To make it on time, Tesla decided to use Samsung SDI lithium-ion cells. The system apparently uses 640 individual Powerpacks (200 kWh each).

The ESS will now help to stabilize the grid in the summer (it's December, a hot month in Australia right).

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

The cost of the 100 MW/129 MWh battery storage is estimated at some $50 million.

State Premier Jay Weatherill said in a statement:

“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."

Source: Reuters