Notes and Sources

1 Energy Information Administration, Annual Energy Outlook 2004, DOE/EIA-0383(2004) (Washington, DC, January 2004), http://www.eia.gov/oiaf/aeo/pdf/0383(2004).pdf.

2 Energy Information Administration, The National Energy Modeling System: An Overview 2003, DOE/EIA-0581(2003) (Washington, DC, March 2003), http://www.eia.gov/oiaf/aeo/overview/index.html.

3 Unconventional gas refers to tight (low permeability) sandstone gas, shale gas, and coalbed methane.