I recently purchased a Whole Home Energy Monitor.
Its super awesome. Why? I can tell you what my energy use is, currently.
Go look at your meter and tell me what you are using, right now. Its not easy, and the power company likes it that way. I got a huge power bill and figured out my furnace had a problem. Well, if I had this thing I would have known the second day in the month that something was draining huge amounts of trons.
Anyway, its a good thing.
http://www.amazon.com/Efergy-E2-Wireless-Electricity-Monitor/dp/B003XOZG0Y/ref=pd_rhf_se_s_cp_5_SW9A?ie=UTF8&refRID=0K9CXPM305W4N7X7D7HK