Yesterday, I cleaned a home with another outlet box outside just under the breaker panel, which had 2 separate 20 amp plugs. They had a cord plugged into one that went to their garage that they use to charge their electric car. The home was fairly new as well as the other home with the same set up. I think it may be something new for the growing electric car market. I hope it continues because it makes it so easy to plug both plugs outside.
The JAGUAR MX-2 ETM @ cross-american.com