No, what are you talking about? A nuclear power plant takes less than a decade to build.
Renewable energy at the scale of a country is impossible to achieve in such a short time in Europe. We dont have huge geothermal taps, which countries having achieved 100% renewable energy have, and we consume a lot more energy.
Cheaper is great, but it's not continuous, it's not scaleable in a short period of time, and requires a fuckton more maintainance capability than a dozen nuclear power plants.
I will reiterate: A full renewable energy grid in Europe is impossible with our current tech, especially in a reasonable timeframe. That's why instead of solar power plants, countries prefer to subsidies local, individual solar panel installations, for instance.