Nuclear's only an option if we have breeder reactors that can reprocess all the waste into non-radioactive outputs. In the meantime you still have all that radioactive plumbing being replaced that needs to be handled, and I really don't want that being buried in my watershed, food bowl, or anywhere that might end up being a watershed or food bowl for people elsewhere in space and time.

So find a way to build a nuclear reactor with non-radioactive outputs, built with materials that do not corrode due to the radiation, and we have a deal!

Oh, and the final result needs to have a higher EROEI than current state-of-the-art solar panels.