I've wondered how heavy construction equipment would work. Bulldozers trailing thick power cables seems... problematic. Yes, I'm aware of huge draglines connect

I've wondered how heavy construction equipment would work. Bulldozers trailing thick power cables seems... problematic. Yes, I'm aware of huge draglines connected to power sources with cables, but they aren't very mobile and you don't need to worry about other equipment cutting the line. Don't think batteries would do, either. So, ICE with compressed oxygen?