[jnsaff2]

Heat reduces power of PV Panels by up to 10%. Looking at a random spec sheet it's -0.35%/C so from 45C to 75C the difference is roughly 10%. I would not call it "very very small". Also increase in temperature reduces the lifetime of the panels.

That said I too think that taking that hit will never be offset by all the faff of dealing with ocean water, waves etc.

Moreover the big installations in Morocco have not been PV but concentrated mirrors in which case any increase in heat is improvement and brooms are more important.