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The bottom line is the same as with solar panels: if you have $X to invest in wind turbines, solar panels, or whatever, it's much more cost-effective to put them in a good location where they can generate whenever the wind's blowing or the sun's shining, than to put them on top of a vehicle where they have much less than optimum exposure to their power source, plus you have to burn energy to haul around the extra weight.
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