Yeah, they are very expensive to build...but that's not why we don't have a bunch of new ones and others that are being built. It's because the greens used excellent fearmongering for the last 3 decades. Ignorance can be a very dangerous thing....especially when it can't be questioned because "OMG you must hate the environments!"
OMG you must hate the environments!
In all seriousness, our goal should be to provide the most energy in the most efficient way possible. Nuclear, hydro-electric, wind, solar, and geothermal are all good, environmentally friendly ways to provide electricity.