They only cost more because of "environmentalists" fighting both new reactors, fuel element transport and waste storage tooth and nail in a way they don't fight coal ash ponds or heavy metal tailing lakes...

(The average lifecycle cost of nuclear power at scale in France - where plants were built before anti-nuclear hysteria - is about 7 cents per kWh, same-ish as the cost of solar or wind fleet, and with fewer intermittency problems. Solar might be cheaper in Hawaii and California, but most places are not blessed with 3,000 hours of sunshine a year.)