We put an extensive Powerhouse Dynamics system in a deep energy retrofit house in Las Vegas
It does a good job of presenting discrete energy usage at the circuit breaker level. And that's the rub as well, because often circuits combine several appliances such as lighting and a dish washer or refrigerator...With a little effort it is possible to isolate an appliance, however.
In the case of this house, we were able to rewire and isolate the circuits so they actually isolate most of the appliances and lighting.
Great Data collection!
There are lots of other low cost logger options mentioned in this LinkedIn group discussion thread:
http://energy.gov/articles/federal-and-industry-partners-issue-chal... Peter were you spying for the Feds?
LOL...As if Eric Holder doesn't have enough problems....