The simple premise that "you can't manage what you can't measure" means data center operators have to take steps to measure device-level power consumption. Green web hosting operations have to understand their power use before they can credibly become a green web hosting operation.
The first step is to count up basic energy consumption. This will become the base from which future improvements are calculated.
Efficiency Metrics
Power Usage Effectiveness (PUE): the ratio of the total energy used by a data center, including IT equipment, and the energy consumed by the IT equipment only. A higher PUE means the power used in the data center primarily goes to running the IT equipment. The total energy use includes other things like lighting and air conditioning, while the "IT Equipment" is purely the server computers and routers and whatnot.
Corporate Average Data Center Efficiency (CADE): is the energy efficiency of facilities, their utilization rates and the level of utilization of servers.
Source: The Whys and Hows of Measuring Power in your Data Center
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