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Nuclear chemist here. It's easy to post lazard lcoe analysis, but in reality, it's much more complicated. One thing, research slowed in the 70's, and only lately do we see real advancements. Second, interest rates highly define the costs - you can make it cheap, you can make it hellishly expensive. Third, there is public perception. Even in commie China, there is an anti-nuclear movement slowing things down. Forth, we have build times. On average, a plant takes 7.5 years to start giving us power. Wind can be 2-3 years, similarely with solar. Yes, nuclear takes longer to build, but that can change - the Chinese and Japanese built modern plants in 5 years, China also got better at pumping out solar. There are also more issues, but nuclear is not a silver bullet - neither is solar and wind. Solar and wind are both 100+ year old technologies that still did not solve their intermittancy ( batteries are still way too small and expensive). Nuclear stagnates due to multiple issues. But those issues can be solved. Also, nuclear is far from dead, as there are 15 new reactors coming online this year, and 2020 was the 7th year in a row that we have grown in production