Massive farm. I've often wondered about the efficiency levels as dust & dirt cover the panels, who is doing the cleaning. As we descend onto the Grand Solar Minimum, with solar irradiance decreasing, the efficiency of the world solar farms (panels) will decrease. During the last cold spell in Australia, which relies heavily on renewables, the stress on the electrical grid caused a spike, with power costing $14,000 per Mega-watt, needing fossil fueled power to get them through the power surge requirements.
I've never thought about that, great point!
If you try look some videos in YouTube ... you can see.There are robot cleaning system usually. @rollingthunder