article_snippet.sent: The device, which could be in homes by the end of summer, will be able to store electricity at night when Musk is cheaper.
article_snippet.sent: Musk said that the devices can be stacked together to provide more energy.
article_snippet.sent: According to tech site Mashable, Musk told attendees at the event: 'Our goal is to fundamentally change the way the world uses energy.
article_snippet.sent: Our goal here is to change the way the world uses energy at an extreme scale,' Tesla said. '
article_snippet.sent: Tesla sounds crazy, but Our want to change the entire energy infrastructure of the world to zero carbon.'
article_snippet.sent: Musk said that Musk hopes to sell hundreds of millions of the devices, which Musk touted as a vast improvement over currently-available models.
article_snippet.sent: In the past Musk has said such early batteries 'suck'.
article_snippet.sent: Musk said that Musk hopes to sell hundreds of millions of the devices, which Musk touted as a vast improvement over currently-available models.
article_snippet.sent: 'Our goal here is to change the way the world uses energy at an extreme scale,' Musk said.
highlights_snippet.sent: Musk will let users store renewable energy, or pay lower, off-peak rates .
  