Thanks for that, again sorry for this simple Question, but where will this script go and shouldn't I need to define this new energytype in the cars' entity.lua?

I had a pretty neat idea to make a Electric car which you drive up to for example a Substation and charge it up. I'm new to modding Factorio, so this might be a really simple Problem, but
1. I want to detect if the car is in an powered Area(next to an electric Pole) so i can trigger the charge up ...