Indeed. I didn't read the whole thing but presumably that's Carnot efficiency of the nuclear reactor as heat engine? In which case .. who cares? The important f

Indeed. I didn't read the whole thing but presumably that's Carnot efficiency of the nuclear reactor as heat engine? In which case .. who cares? The important factors are "is there going to be sufficient fuel?" (insert argument about breeder reactors), "is it cost (money or resource) effective", and "is the proliferation risk important". By comparison, the increase in power/area efficiency of solar panels is useful but not very significant either; again, the critical factor is the cost falling by several orders of magnitude in the past decades.