Measuring waste is key!  Maybe you are already thinking about an IT energy management initiative for your organisation? Maybe you have already tried, but can you really tell the board how effective your solution is?  Deploying PowerMAN will quickly tell you about your IT energy usage and waste. You can use this information to develop your policy and measure future improvements.

Or you could try this free resource kindly developed by Lisa Nelson from the University of Liverpool.

The Goal: We wish to enter a state of significant power-saving on computers that have been idle for a certain length of time. We want to do this without danger of loss of data, and without an unacceptable number of error messages or other unfavorable user interaction. Being a university, we would also like to do it at no cost.

http://www.liv.ac.uk/csd/greenit/powerdown/index.htm