At this point it's not on the agenda. The EPA is in the information gathering stage. Computers come with all kinds of configuration options, but Energy Star has come up with ratings for them. It's not impossible.

How do you measure energy efficiency? If you can't measure it, you can't manage it. These competing companies will have to come to a meeting of the minds. No measurement is perfect -- you just have to come up with one that's the least wrong.