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A real-world case for PV is https://en.wikipedia.org/wiki/Ouarzazate_Solar_Power_Station in Morocco which occupies 2500 hectares with nameplate power of 582 MW, which gives an actual nameplate capability of 23.28 W/m^2 which is ~400x less than the theoretical irradiation.
Another important factor is that the plant uses vast amounts of water - 1.7 million m3 per year or 4.6 liters per kWh - for cleaning the mirrors, which is 23x more than a coal plant.