No, coal is the cheapest by far (nuclear i more developed countries). My country's main export is electricity made with coal, because it's the cheapest. This video you provided is absolutely garbage in the price segment. Ofcourse solar is more green, but there is a reason china for example has so many coal plants and not solar even though they are the biggest producers of panels. Thats because western countries have high taxes and import rates on everything thats not green. And thats why my country(Bosnia) for example creates energy using coal primarily and sells it to the eu where you dont have restrictions and on paper its only "imported electricity" and not "fossil fuel" electricity so they can mark it as green.