Fast Company — The United States generates more energy than any other country in the world -- and wastes more than half of it. Efficiency, it turns out, can be a rich resource. Those riches are being exploited by a kind of alchemy that combines science with business. Efficient technologies, from sensor-equipped LED lighting to smart electric meters, are flowing at a brisk pace out of labs, attracting capital from Goldman Sachs and Silicon Valley VCs, and support from the likes of Walmart, Chevron, Samsung, and California's major utilities.
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