I wouldn't bet on it too soon. When I was involved in the home automation industry back in the mid/late 90's it seemed like that sort of thing was imminent.

Invensys and CutlerHammer both had power-monitoring devices, electric meters and so on (I still have some CH power monitoring sensors on the main power lines at my house with a system that I put together that tracks KwH, heating oil consumption and a few other metrics).

Anyway... I haven't really seen those products move an inch in the last dozen years (other than press releases).

While I do believe that the real-time feedback is helpful, I also more strongly believe that people who really want to cut their power usage will do so by simply turning more things off or using things less. For the most part, a monthly feedback cycle isn't really THAT long. In some cases the month-long feedback loop let's you measure a more cumulative effect in dollars instead of cents.

Extremely likely. There are good chances that in 30 years most houses are as automated as our off-grid house on Great Barrier Island and come with power monitoring as standard.

http://blog.gridspy.co.nz/2009/08/the-barrier-house.html

We plan to provide the devices today.