“monopoly prices” does overstate the case currently.
My point was only that if you have two competing power trains and two competing fuels — then neither will be able to enjoy monopolistic power—which includes the power to set prices. Rather they will tend to compete against each other—which tends to put downward pressure on prices.
But it isn’t one company with a monopoly. It is hundreds. The competition exists.
When OPEC produced too much of the world’s oil supply, it had more ability to control market pricing. Even that has diminished.
That is like saying there is no competition for fast food because all the different companies are still making fast food.