The U.S. Energy Information Administration produces a report each year on how energy in the US is produced and consumed, called the Annual Energy Review. Energy use by sector for 2006 is summarized below:
- 32% of US energy went to industrial uses
- 28% to transporation
- 21% to residential
- 18% to the commercial sector
Within the residential sector, the DOE’s building energy data book breaks current usage down even further.
The Rocky Mountain Institute has a great series of home energy briefs that give methods and background for some of the more effective residential interventions.
The National Renewable Energy Laboratory has a suite of tools available for estimating energy usage and lots of ideas for energy saving technology.
EPA’s EnergyStar site also has a great deal of information on building technology and home improvement.