In pictures: The world's coolest, greenest datacentres

Datacentres are taking advantage of energy saving technologies to run more efficiently in order to be kind to the environment and the bottom line

Interxion, Kista, Sweden This data center housed in an old factory building uses seawater cooling to rack up impressive cost savings. The company says the cost is like paying about 3 cents per kilowatt hour for conventional air conditioning. The water comes in via underground channels built for earlier cooling needs in the area and is sent through two separate data centers. The water comes in the first at 42.8 degrees F, enters the second at 53.6 degrees and exits at 64.4 degrees. Then a heat pump pulls off some of that accumulated heat to warm local homes. The company says the setup saves $1 million a year.

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