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From: http://www.zdnet.com/toolkit-calculate-data-center-server-power-usage-7000013699/

  For instance, one server can use between 500 to 1,200 watts per hour, according to Ehow.com. 
  If the average use is 850 watts per hour, multiplied by 24 that equals 20,400 watts daily, or 
  20.4 kilowatts (kWh). Multiply that by 365 days a year for 7,446 kWh per year. According to the 
  US Energy Information Administration (PDF), the average kWh cost for commercial use from 
  January 2012 through January 2013 was 9.83 cents. So that means it would cost $731.94 to power 
  the aforementioned server for one year.

From: http://www.vertatique.com/average-power-use-server

  Using Koomey, a 427W server running 24/7 would directly consume 3741 KWH of electricity annually, 
  or ~$400.00 at the USA commercial pricing average of $0.107/KWH. Factoring in the cooling load at 
  1X (2.0 PUE) puts the annual energy cost per server at ~$800.

From: http://networking.ringofsaturn.com/Tools/serverpowerusage.php

  .1181391 = Cost per kWh (aprox. cost of green energy) (2009)

From: http://www.servermonkey.com/hp-proliant-dl380-g6-6-port-configure.html

Build Your Own Refurbished Server

From: http://www.vibrant.com/models/hp-dl180/index.html

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