
http://www.youtube.com/watch?v=vX0G9F42puY (1080p available)
Robert Llewellyn talks about the electric grid monitoring in UK and it's equilibrium based on most options of energy sources, including renewable

In the end the message EV drivers should be proud of is: EV's charging at night is good for leveling up the energy consumption, and even with the predicted number of EV's in 2020, they won't be able to keep up with the demand of energy during the day

But in Portugal where the renewable represents a big part of the energy produced, there have been some rumors to end cheap electricity at night... does this make any sense?