Overnight
Hey Mr Phreaky,
it happens the power companies have a surplus of electricity available overnight, which -- surprise -- happens to be when most people *aren't* driving around. The baseload stations can't ramp up production for the day and shut down overnight, so at night they have a fair amount of overcapacity. In the UK, you can buy that night-time electricity at less than a third of the daytime price, and overnight charging actually makes the entire system (power station + distribution grid) more efficient by averaging out the load somewhat.
Biting the hand that feeds IT
