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3. Apple (Maiden, N.C.)

Breaking somewhat with its policy of super-secrecy, Apple has committed publicly to powering its facilities with renewable energy including solar, wind, hydro and geothermal. For example, take this Maiden, N.C., data center powering some of Apple's cloud services.

For starters, it seems to be the largest LEED Platinum facility of its type. The property already boasts a 100-acre, 20-megawatt solar array that can generate 42 million kWh annually – and its twin should be operational nearby by the end of this year. Other design features include a chilled-water energy-storage system along with free outside air cooling, enabling its chillers to be shut off more than 75 percent of the time. High-efficiency LED lighting is teamed with motion sensors.

Apple is also working on green data centers in Nevada and Oregon.

(Credit: Apple)