If you were charged with building a city from scratch (unlikely, I know) and had to power the thing, the question wouldn't be
"nuclear or solar/wind?". It would still be
"Is this near a good damming location? No? So... do I want nuclear, or do I want to burn something?"For renewable base load, your options are basically hydro or burning something renewable like ((farmed) wood, trash, or methane from trash). Otherwise, with current technology, you are left with either burning atoms or burning something made of dinosaurs that you claw from the earth.
Solar and Wind might be able to do some limited base-load with massive efficient energy storage schemes, such as pumped-storage hydro, but really I don't see that scaling very far. PSH is about as good as it gets for that, and it is highly dependent on local geography.. Other schemes like storing molten sodium or compressed air don't really operate in the same class as PSH.