Nuclear is the only clean option, we need to spend a lot more money making it safer and cheaper.
Hydro is bad for the local environment.
Nuclear has a minor waste problem which isn't really that bad.
None of these are perfect solutions. Nuclear shouldn't be ruled out of a green mix.
Storage isn't that expensive, E.g. through gas. E.g. Germany maintenances Gas storage (currently filled with non renewable gas) that can power the entire country a Quarter of a year. Without the actual need through renewables.
Nuclear with waste management would have to be cheaper than that.
(Aside from the subjective evaluation of the associated risk of nuclear energy)
With per megawatt waste for nuclear per 20 years being exponentially smaller in volume.
And where the alternative is coal /natural gas (rather than wind or solar) where these produce more volume of waste in a month/year than nuclear does in a decade. (And in the case of coal, we store worse waste in ways it often enters our fresh water supplies.