http://download.microsoft.com/download/a/7/b/a7b72ab1-ca17-4589-923a-83b0ff57be6d/Energy-Efficiency-Best-Practices-in-Microsoft-Data-Center-Operations-CeBIT.doc 

In the past, the cost of physical space was a primary consideration in data center design. More recently, the cost of power and cooling has risen to prominence. Data center managers now must prioritize investment in efficient power and cooling systems to lower the total cost of operating (TCO) of their facilities.

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Caption: Graph representing the annual amortized costs for a 1U size server.[1]

Microsoft responded to this shift by adopting the following top 10 best practices for energy efficiency in Microsoft data center operations...


[1] http://www.electronics-cooling.com/articles/2007/feb/a3/