Just look at any map of solar power potential, solar irradiance, hours of sunshine of Europe.

Latitude?

I'd say "Supplementary Information for Strategic deployment of solar photovoltaics for achieving self-sufficiency in Europe throughout the energy transition"[1] fits the bill. It lays out various paths to 100% renewables (which in Italy, like in Spain, is heavily solar) by 20250

[1]: https://www.nature.com/articles/s41467-025-61492-9.pdf