RE: Nissan LEAF
I haven't driven the Leaf, but like the reverse concept add on. Where you can charge the car from cheap electricity ie. Home Solar or work. Then connect the car to the house and run the house from the Leaf. This was mainly developed after the Tsunami in Japan when power was a bit hit and miss, although it had been considered for a while before.
Going to be useful if we get all the power cuts in the future they they say we will get.