When cars were introduced gasoline was cheap, today that is very different. Electricity today seems to be cheap, but how will that be in 100 years ? In Germany

When cars were introduced gasoline was cheap, today that is very different. Electricity today seems to be cheap, but how will that be in 100 years ? In Germany i already pay twice what people in the US pay for electricity (about $0.28 per kwH) and its only getting more expensive. Of course, gasoline is a fossil fuel which will run out some time, but dont forget that most of our electricity is still generated by the same fuels (coal!) and with rapidly rising electricity usage i dont see a complete fossile-fuel free electricity infrastructure anywhere near. Even if thats possible with lots of wind/solar/whatever power, i highly doubt its going to be cheaper as we already pay a premium on "green-energy" today, governments move away from nuclear power etc.