Telsa developed a large, wall-mount battery that will store electricity from a grid or from solar and wind generators on a site, powering your home. All from the same location. If the grid goes down, the Powerwall will continue to power the residence indefinitely.
It’s been in development since 2015, but has recently started generating more mass-market popularity. Pretty cool stuff.
Some links to learn more are below.
Official site: Click here
Article (from 2015): Click here