Batteries should help to stabilize the grid, instead of those diesel generators.
Over the last few years, Germany has had several thousand residential battery systems installed, similar to the Tesla power wall.
In addition, a 5MW battery plant has been in operation for a while now, like Tesla's Powerpack.
Younicos: Europe
Edit: this company already sells home units:
http://www.sonnenbattery.com/en/stro...speicher/home/