We know roughtly what it costs to build solar or wind. There is a bit of subsidies and commercial parties take care of the rest. In the short term we need natural gas as a backup for solar and wind. But even that is not hard to build.

And then we have nuclear. Projects that are late, projects cost way more than projected. Building a nuclear powerplant takes so much time that financing the project is almost impossible.

Today, nuclear is just not a practical option. We need to build as much non-fossil capacity as we can and as quick as we can.

In future, we have to solve the storage problem for wind and solar. If that becomes a problem, then nuclear may make a comeback. At least, if somebody can figure out how to accurately project the cost and construction time.