> But an electric grid based on renewables, if we add the costs for storage, backup generator, power lines upgrades needed for smoothing out regional variations of production, is more expensive

Show your work. I'm telling you right now you're wrong. https://news.ycombinator.com/item?id=45446112

Even the Texas power grid makes heavy use of wind and solar.

> So stockpiling few years worth of fuel is not a problem

Weird you were oddly concerned about being "China dependence for PV" but this you just wave away. Stockpiling a few decades of PV and batteries is also not a problem.

"Rare earths" (not really used in panels) are plentiful too. Refining them is polluting and low-margin so developed countries prefer not to deal with them. Btw uranium is the same.

> Nuclear energy also quite safe

I didn't say anything about it being unsafe. But making it that safe currently costs a lot of money in materials, labor, and regulations.

Honestly it feels like you decided beforehand "nuclear is the way" and are trying to make every fact fit that. Or you're a troll/paid off by Big Oil. Sorry.