My personal true claim about solar that is generally ignored or unknown is that dust reduces solar efficiency by 40% and that the mitigation is frequent washing of panels, which results in considerable water use in precisely the worst areas for that.

This 2024 paper cites a 2016 paper about clouds and dusts that finds 10.4% reduction in efficiency when the relative humidity was 52.24% after two weeks. (The 2016 study is cited in footnote 184 under clasim 12). That's not a desert condition, I can assure you.

https://sustainenergyres.springeropen.com/articles/10.1186/s...