1. American Clean Energy Leadership Act of 2009, S. 1462, 111th Congress, Section 132.
2. Practical Energy and Climate Plan Act of 2010, S. 3464, 111th Congress, Section 301.
3. President Barack Obama The State of the Union Address Washington DC, 25 January, 2011 (2011).
4. Energy Information Administration Electric Sales, Revenues, and Average Price 2009 (2011).
5. US Census Bureau American Community Survey 5-year Estimates 2005–2009; available at
http://www.census.gov/acs/
.