If we are talking about electric cars, there are more than ways to power it aside from charging it in a power station. You an add a solar charger on the roof or simply turn it into a car that can power from static charges. Static charges can easily be produce by friction and when you are on the road, that won't be a problem.
In this game, you need to grind your way to the finish line as the electric that will be produce will help you to speed things up. Try to get ahead of the rest of the car and you can expect higher reward money, which you can use to upgrade your car, pay for the next race, or buy a new car.