Meanwhile nuclear plants come with months worth of energy storage, as fuel is storage. For long term (like seasonal) variations in wind/solar output, you're pr

Meanwhile nuclear plants come with months worth of energy storage, as fuel is storage. For long term (like seasonal) variations in wind/solar output, you're probably not going to be building enough batteries to bridge that gap, so to stick with just wind/solar you would need to either overbuild (perhaps massively) your generation capacity, or build a global grid. A global grid introduces geopolitical risks (your neighbor becomes not-so friendly and cuts the link when you don't have sufficient generation), whereas massive overbuilding would be expensive. Having some nuclear plants may be cheaper route.