Thank you for the long and detailed answer. I know that the situation in Italy is very different to Germany (were I‘m from). Even from the outside it seems that the left struggles and keeps infighting for years now. The financial crisis has caused huge damage and they don’t have any answers.
In the end your last sentence is what it boils down to: They aren’t doing it right.
The concept of baseline power is no longer needed. Scientists wrote about that for years now. Battery storage and smart grids are growing faster and cheaper than nuclear ever could.