Answers: Honestly, it is because solar panels alone are too unreliable (cloudy days, etc.) and WAY too expensive to use and profess. It would not be economically feasible.
some do, but solar doesn't clear enough power right very soon to run a large trade plant by itself, unless u had a integral lot of panels which they might not hold room for.
wow what a great question if it is true. I would guess that it might be a issue of scale. They may not hold enough room on their roof for their power requirements. Factories typically use profusely more power per square foot of their buildings than, for example, residential applications. Perhaps they could partner with neighboring landowners for their space.
Simple. First, you want a very voluminous battery or some sort of storage facility to (obviously) store the power you may hold gained from the panel.
Second, individual political and financial agenda which I don't have plenty time to enumerate and explain to you.
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