18. Green House Data
Green House Data's Cheyenne, WY, data center is, Green House said, 75% more efficient than the national average. It has a PUE score of 1.14, uses passive cooling, and its location was chosen due to the geographic safety of the region, meaning less costs for disaster recovery will be necessary in the long run.
SEE: Green tech initiatives: Best practices and breakthroughs (free PDF) (TechRepublic)
Image: Wyoming Public Media