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I agree with both Scubajrr and frgough above as to the issues with solar power, but you have to add another: Storage. Since solar power is intermittent, you have to store power for later use. Right now, that means batteries, and batteries are expensive, short lived, and contain toxic materials. When you look at the total cost of adding solar power to a building (because of frgough's argument it is not suitable for large scale), it is just not cost effective. We need a technological leap on the storage side to make it feasible.
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