Sources

• Electricity consumption of common appliances: Estimating Appliance and Home Electronic Energy Use, US Department of Energy, August 31, 2012.
• Energy consumption for water heaters [standard 50-gallon models]: ENERGY STAR Residential Water Heaters: Final Criteria Analysis, US Environmental Protection Agency, April 1, 2008.
• Fuel economy for NGV Honda Civic: 2012 Honda Civic Natural Gas Overview, American Honda Motor Co., Inc., 2012.
• Fuel economy for CNG transit buses: Business Case for Compressed Natural Gas in Municipal Fleets, National Renewable Energy Laboratory, June 2010.
• Natural gas consumed in production of nitrogen fertilizer [anhydrous ammonia]: Natural Gas and the U.S. Fertilizer Industry, Harry Vroomen, The Fertilizer Institute, July 15, 2010.
• Nitrogen fertilizer and corn: Fertilizer Use and Price, Table 10-Nitrogen used on corn, rate per fertilized acre receiving nitrogen, selected States, 1964-2010, US Department of Agriculture, Economic Research Service, May 27, 2011.
• Average household fuel use for space heating: 2005 Residential Energy Consumption Survey–Detailed Tables, US Energy Information Administration, January 2009.
• Average heating degree days data: Table 1.9 Heating Degree-Days by Census Division, Selected Years, 1949-2011, Annual Energy Review 2011, US Energy Information Administration, September 2012.
  • For more info about heating degree days, see: Degree Days, Energy Explained, US Energy Information Administration, October 21, 2011.
• Average household natural gas consumption: Consumption in Physical Units, Totals and Averages, U.S. Homes (CE2.6), 2009 Residential Energy Consumption Survey, US Energy Information Administration, October 16, 2012.
• Wholesale natural gas price data: Henry Hub Gulf Coast Natural Gas Spot Price, US Energy Information Administration.
• Other Assumptions: 7.2 MMBtu/MWh average heat rate for electricity generated from natural gas fired combined cycle power plants.