The power generation is far more centralised, meaning economies of scale/size can apply both to efficiency of the generators (they can operate optimally all the

The power generation is far more centralised, meaning economies of scale/size can apply both to efficiency of the generators (they can operate optimally all the time) and to infrastructure around them, e.g. for a hypothetical CO2 capture system, it is almost certainly easier and cheaper to apply huge versions to 100 power stations than to try miniaturise to fit to 100 million individual cars.