The giant Tesla battery began sending out stored wind power to South Australia's electricity grid a day ahead of schedule due to increasingly hot weather.

The battery was meant to be switched on today, with Premier Jay Weatherill due to visit the site to mark it's official opening on the first day of summer.

But the battery was called on a day early, being put to use on Thursday to meet demand as temperatures across the state hit the mid 30s.

The 100MW/129MWh battery is capable of giving about 30,000 homes electricity for just over an hour.

Tesla claims that the lithium-ion battery has the "largest" storage and is the "most powerful" device of its kind in the world.

News Corp Australia

Woman taken to hospital after three-vehicle crash at roundabout

Woman taken to hospital after three-vehicle crash at...

Woman taken to hospital in ambulance

So sweet to be loved by you: reliving first date at festival

So sweet to be loved by you: reliving first date at festival

He was in Gatton, she was in Roma, they met halfway in Chinchilla.

Police reveal tragic encounter with pre-teen meth addicts

Police reveal tragic encounter with pre-teen meth addicts

Police share the horrors they come face-to-face with