They'd be carbon free, relatively cheap, and according to the industry, inherently safe. An underground mini-nuke could power a village : a report.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/small-town-nukes
[2] http://admin.indiaenvironmentportal.org.in/category/author/chris-carroll
[3] http://admin.indiaenvironmentportal.org.in/category/journal/national-geographic
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nuclear-power
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy-technology
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/turbines
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nuclear-power-plants
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nuclear-research