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Bright Prospects

Last year Microsoft outfitted its campus in Silicon Valley with a solar system from Sun-Power, a local company that makes high-efficiency (and, some say, the world's best-looking) solar panels. A few months later Microsoft's arch-rival, Google, began building something on an even grander scale-one of the largest corporate solar installations to date. But all of this may yet be topped by Wal-Mart.

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