The sun doesn't always shine, and the wind doesn't always blow.
Which is why you connect countries together. Combined with having more than enough capacity. And battery storage.
All of that is still significantly cheaper than nuclear. Plus it can be built way faster.
Nuclear is expensive and takes ages. And that's just the budget, it'll easily go crazy over budget and be a decade late.
You can easily see how much energy those wind turbines produce. I haven't seen your claim made in many years. It simply isn't true. Just check the production of the various wind farms.