And yet, very few companies (in the U.S. at least) want to build them. It's because the worst case scenario they're planning for is very bad indeed, so they have to spend all this expense to keep it from happening. Compared to every other renewable energy technology, it is more risky and has a much higher cost to get up and running.

And that's setting aside the other problem which is that many of the countries that are still growing, and will need new, clean sources of power are countries that don't have as much nuclear expertise to begin with. And some of them are countries that the West has tried to actively keep from having nuclear capability.

Better solar, wind, etc., has fewer risks than better nuclear tech in the long run.