Solar’s day as an economical alternative to coal may have come. Nanosolar has started selling their “printed” solar cells.
http://www.engadget.com/2007/12/18/nanosolar-begins-shipping-world-s-lowest-cost-solar-panel/
http://www.nanosolar.com/blog3/2007/12/18/nanosolar-ships-first-panels/
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