Renewable Energy

In addition to the fact that they use land otherwise unused and also result in less water loss through evaporation, what is another key benefit of having solar panel over water surfaces?

It is easy to clean them
It is cheaper to install over water than on land
Less maintenance needed
The water underneath cools the panels thus resulting in higher efficiency

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Correct Answer
The water underneath cools the panels thus resulting in higher efficiency

And here's something for you to take back

So here's the dope.

The eficiency of solar cells also varied with temperature. Put simplistically, solar cells and panels cells have higher efficiencies at lower temperatures, and conversely, their efficiency drops at high ambient temperatures.

It's is thus obvous that if solar panels are cooled continuously, their efficiency can increase.

And this is precisely water under solar panels can do - cool them cntinuoiusly.

QED