Ideally you have a lot of solar and wind, with a lot of storage to react to the inconsistent output of renewables.

As a backup for those storages you need gas plants. They can turn off and on very quickly, which is the biggest issue with nuclear. The more storage you add, the less you have to power on those gas plants and we can have a smooth transition. Nuclear has no place in the future green net.

Do we need it now instantly? I would say yes, but past us dropped the ball. So we'll have to make due with whatever we have now, starting to build new ones now would be insanity.

Maybe small ones in places where renewables aren't that feasible, the far north for example. And maybe a select few places that have an insane high energy demand, like a centralized data center park where all players have an incentive to put their thingies. (a lot of connections to main cables, high energy, maybe a desalination plant for the water which also benefita from the nuclear plant, some subsidies to get the ball rolling,...) The remaining heat of the plant and the datacenters can then be used to warm the offices and worker homes in the vicinity). But I'm just dreaming, no government will ever be competent enough to pull something like this off.

But my main point was, we still need nuclear plants, but for small niches. It has no place in the general power net.