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The price of solar systems is coming down, though a set of rooftop panels can still cost thousands of dollars. The next generation of PV (photo voltaics) will put electricity-generating solar cells in films, which can then be embedded in all sorts of flexible materials. Soon, solar will be embedded in virtually everything, from shingles and windows to the tops of cars, with every bit of solar power displacing electricty produced from fossil fuel.

Solar power's costs are predicted to match coal's by 2010 -- get your roof ready.

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