Opower will be one of the best long-term plays among the recent wave of cloud-based IPOs because it has already demonstrated the ability to grow revenue in the highly regulated utility space, says the company's CEO Daniel Yates. Utilities are under pressure to conserve energy production and Opower's software enables them to do it. Yates says Opower has collected data from 52 million households, and has served 93 utility customers in 8 countries, including 28 of the largest 50 U.S. utilities.

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