At a press conference yesterday, Tesla founder Elon Musk revealed the company’s latest creation: The Powerwall consumer battery. He told reporters, “Our goal is to fundamentally change the way the world uses energy. It sounds crazy, but we want to change the entire energy infrastructure of the world to zero carbon.” The idea behind the devices is to allow people to get energy off the traditional grid and have a source of electricity in times of outages. The Powerwall also could have implications in developing countries where electricity infrastructure isn’t available.

The $3,500-device—which will hit the market in the coming months—is based on the battery used to power their high-performance electric cars. Though it’s designed to utilize and store solar power, the Powerwall can also store energy from traditional sources, but can be programmed to absorb it during cheaper, non-peak utility hours. The company is planning partnerships with energy companies to make it practical for consumers …