|  Definitions, Sources and Explanatory Notes |
|--------------------------------------------------|
|  Category:   | Natural Gas Consumption         |
|-----------------------------|---------------------------------|
|                             |
|  Topic:      | State Shares of U.S. Deliveries |
|                         |
|-------------------------|
|   Definitions |  |
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| Key Terms                  | Definition                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Commercial Consumption     | Gas used by nonmanufacturingestablishments or agencies primarily engaged in the sale ofgoods or services. Included are such establishments as hotels,restaurants, wholesale and retail stores and other service enterprises;gas used by local, State, and Federal agencies engagedin nonmanufacturing activities.                                                                    |
| Delivered (Gas)            | The physical transfer of natural, synthetic, and/or supplemental gas from facilities operated by the responding company to facilities operated by others or to consumers.                                                                                                                                                                                                                |
| Electric Power Consumption | Gas used as fuel in the electric power sector.                                                                                                                                                                                                                                                                                                                                            |
| Industrial Consumption     | Natural gas used for heat, power, or chemical feedstock by manufacturing establishments or those engaged in mining or other mineral extraction as well as consumers in agriculture, forestry, and fisheries. Also included in industrial consumption are generators that produce electricity and/or useful thermal output primarily to support the above-mentioned industrial activities. |
| Residential Consumption    | Gas used in private dwellings, includingapartments, for heating, air-conditioning, cooking,water heating, and other household uses.                                                                                                                                                                                                                                                     |
| Vehicle Fuel Consumption   | The quantity of fuel used by vehicles.  Vehicle fuel consumption is computed as the vehicle miles traveled divided by the fuel efficiency reported inmiles per gallon (MPG). Vehicle fuel consumption is derived from the actual vehiclefuel mileage collected and the assigned MPGs obtained from EPA certification filesadjusted for on-road driving.                               |
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| For definitions of related energy terms, refer to the   EIA Energy Glossary. |
|  	Sources |
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|  |
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|  | Form EIA-176, "Annual Report of Natural and Supplemental Gas Supply and Disposition", Form EIA-759, "Monthly Power Plant Report", EIA-906, "Power Plant Report," EIA-886, "Annual Survey of Alternative Fueled Vehicle Suppliers and Users"; and EIA estimates. Background on "Natural Gas Annual" data
- Natural Gas Survey Forms and Instructions  Electric Survey Forms and Instructions 	Explanatory Notes  Beginning in 1996, consumption of natural gas for agricultural use was classified as industrial  use. In 1995 and earlier years, agricultural use was classified as commercial use.  
  From 1967 through 1979, data for the District of Columbia are included with data for Maryland.   
  From 1967 through 1979, data for New Hampshire and Vermont are included with data for Maine.    
**Cautionary note:** EIA expects that there may be some double counting in the number of residential and   commercial customers reported beginning in 1999.   EIA collects information on the number of residential and commercial consumers through a   survey of companies that deliver gas to consumers Form EIA-176, "Annual Report of Natural and Supplemental Gas Supply and Disposition".   The survey asks companies for the number of residential and commercial customers served as   sales customers as well as customers to whom they deliver gas purchased from others.   Traditionally, residential and commercial customers obtained gas and all services associated   with delivering it from their local distribution company (LDC). The LDC records these   customers as sales customers. Customer choice programs allow consumers to select the provider   from whom they purchase gas. When customers elect to purchase gas from a provider other than   the LDC, the LDC continues to deliver the gas to the customer even though it no longer sells   the gas. When customers switch to another provider, they become transportation service   customers for the LDC. A residential or commercial customer who enters a customer choice   program may be classified both as a traditional sales customer and, after entering the   program, as a transportation service customer. This double reporting affects the number of   residential and commerical consumers measured.   Customer choice programs, also known as retail unbundling programs, have been ongoing   since 1998.   Description of programs for States offering customer choice.    
Statistical Considerations (Sample Design, Estimation Procedures, Final Revisions, Reliability of Monthly Data).  
    Beginning in 2009 , Pipeline and distribution use volumes include line loss, defined as known volumes of natural gas resulting from leaks, damage, accidents, migration, and/or blowdowns. They also include fuel used in liquefaction and regasification. |