WATCH| Is 'power napping' the answer to the electric car charging challenge?

Automakers around the world are pushing hard for new networks that can charge electric cars fast.

In Europe, some power companies and grid operators are testing whether it might be smarter and cheaper to move into the slow lane.

The prospect of millions of electrical vehicles hitting the highways is a major challenge for power supply companies.

Higher electricity demands at peak hours might lead to black outs.