Take a look here to see a very smart debate on nuclear energy. As we've discussed here in the past, the startup/construction costs of nuclear plants are considerable, and the libertarian in this debate hits that aspect hard--I imagine he'd be ok if nuclear plants were totally built with private money, but I think he rightly sees government subsidies as a necessary part of new plant construction--and I think they will be.
Libertarian arguments are usually coherent, but in many cases, unrealistic. How much is our government spending to maintain the flow of oil from the Middle East...generated by folks who wish us ill? How much will our government spend on tax credits to "green" energy?
Nuclear is here, it is proven, and it will be a big part of our energy security in the future.