Measurement and analysis of energy utilization is a pre-requisite for energy cost reduction. The challenge today is that the sources of soaring energy costs in data centers and IT networks are lost in the maze of countless servers, storage devices and computing equipment sprawled in the data centers of large corporations. Measurement of the sum total of energy costs, their breakdown by each category of equipment and related software and relationships between the components provides cues for lowering costs.  CIOs hard-pressed by the Great Recession have been startled when the facts of energy consumption are revealed to them. Relief follows shock when they realize they have an opportunity to increase productivity by reorganization of their data centers and networks. Just how much impact visibility has on energy efficiency decisions was revealed in a survey by The Green Grid, a global alliance of IT companies and professionals seeking to lower energy costs in data centers and business computing ecosystems.  Completed in November 2009, the survey found that 90% of the 151 respondents had taken steps to reduce energy consumption following measurements of their energy consumption. Yes, 90%! A rude awakening for sure, a number that high is otherwise rare in surveys.