> What opportunity cost? What else are you going to spend the money on that gives you non-polluting 24/7 power output rain or shine?

The opportunity cost of dollars - nobody is going to spend $15 billion on nuclear when much better investments exist.

> We need days at a minimum, weeks for preference. 4 hours is nowhere enough.

Why in the world would you need that much storage? Obviously Finland + solar aren't 100% compatible given the latitude, but fairly extensive modeling shows a route to 99% renewable Australia with only 5 hours storage:

https://twitter.com/DavidOsmond8/status/1666297529418530816

Change the mix to favor wind resources and you could likely achieve the same in Finland with some modest investments in transmission infrastructure.

We would be in a better and cheaper world if we had built a nuclear-first grid 30 years ago -- but we didn't -- and it just doesn't make sense to try to do so now when much cheaper options exist.