My good friend Klaus-Dieter Lange works in the server division at HP.  I ran into him at a Christmas party and he was very excited about his recent work on something called SPECpower.   He had been spearheading the development of a new metric that measured server power consumption.  Most servers have a listed power requirement but it does not accurately describe how efficient the server processes information in relation to its' power usage. 

I think many companies worldwide that are looking to reduce energy consumption will find the SPECpower benchmark important and useful. 

SPECpower article in NetworkWorld