Definitions, Sources, and Explanatory Notes
The EIA-176 form contains responses submitted from an identified universe of pipelines, local distribution companies, and operators of fields, wells or gas processing plants, who distribute gas to end users or transport gas across State borders; or underground natural gas storage operators.
The EIA 191 collects information on working and base gas in reservoirs, injections, withdrawals, and location of reservoirs from operators of all underground natural gas storage fields on a monthly basis.
Field-level data in the "Natural Gas Annual Respondent Query System" (NGARQS) may reflect minor data updates that were not included in the published aggregates in the Natural Gas Monthly and Natural Gas Annual.
|Base gas||The quantity of natural gas needed to maintain adequate reservoir pressures and deliverability rates throughout the withdrawal season. Base gas usually is not withdrawn and remains in the reservoir. All natural gas native to a depleted reservoir is included in the base gas volume.|
|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 for the Account of Others||Gas that is not owned by the company that delivers it to the consumer. These deliveries include quantities covered by long-term contracts and gas involved in short-term or spot market sales.|
|Depleted storage field||A sub-surface natural geological reservoir, usually a depleted gas or oil field, used for storing natural gas.|
|Distribution Use||Natural gas used as fuel in the respondent's operations.|
|East Region||Connecticut, Delaware, District of Columbia, Florida, Georgia, Iowa, Illinois, Indiana, Kentucky, Massachusetts, Maryland, Maine, Michigan, Missouri, North Carolina, Nebraska, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, South Carolina, Tennessee, Vermont, Virginia, Wisconsin, and West Virginia|
|Electric Power Consumption||Gas used as fuel in the electric power sector.|
|Electric Power Sector||An energy-consuming sector that consists of electricity-only and combined heat and power (CHP) plants whose primary business is to sell electricity, or electricity and heat, to the public, i.e., North American Industry Classification System code 22 for plants. Combined heat and power plants that identify themselves as primarily in the commercial or industrial sectors are reported in those sectors.|
|Inactive fields||A field is classified as in inactive in the NGGRQS if working gas has been depleted, there were no reported injections of working gas into the field during the report year on the EIA-191, and the respondent to the EIA-191 confirmed that no injections of working gas into the field are expected to occur during the upcoming calendar year. More information about this classification is available in the methodology for the peak capacity report.|
|Industrial Consumption||Natural gas used for heat, power, or chemical feedstock by manufacturing establishments or those engaged in mining or other mineral extractions as well as consumers in agriculture, forestry, fisheries and construction.|
|Lease Fuel||Natural gas used in well, field, and lease operations, such as gas used in drilling operations, heaters, dehydrators, and field compressors.|
|Maximum deliverability||The maximum daily volume of natural gas that can be withdrawn from a storage field when filled to maximum capacity.|
|Natural gas||A gaseous mixture of hydrocarbon compounds, the primary one being methane.|
|Pipeline Fuel||Gas consumed in the operation of pipelines, primarily in compressors.|
|Plant Fuel||Natural gas used as fuel in natural gas processing plants.|
|Producing Region||Alabama, Arkansas, Kansas, Louisiana, Mississippi, New Mexico, Oklahoma, and Texas|
|Residential Consumption||Gas used in private dwellings, including apartments, for heating, air-conditioning, cooking, water heating, and other household uses.|
|Total Natural Gas Storage Field Capacity (Design Capacity)||The maximum quantity of natural gas (including both base gas and working gas) that can be stored in a natural gas underground storage facility in accordance with its design specifications, the physical characteristics of the reservoir, installed compression equipment, and operating procedures particular to the site. Reported storage field capacity data are reported in thousand cubic feet at standard temperature and pressure.|
|Underground natural gas storage||The use of sub-surface facilities for storing natural gas for use at a later time. The facilities are usually hollowed-out salt domes, geological reservoirs (depleted oil or gas fields) or water-bearing sands (called aquifers) topped by an impermeable cap rock.|
|Underground natural gas storage injections||Natural gas put (injected) into underground storage reservoirs.|
|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.|
|West Region||Arizona, California, Colorado, Idaho, Minnesota, Montana, Nevada, North Dakota, Oregon, South Dakota, Washington, Wyoming, and Utah|
|Working gas||The quantity of natural gas in the reservoir that is in addition to the cushion or base gas. It may or may not be completely withdrawn during any particular withdrawal season. Conditions permitting, the total working capacity could be used more than once during any season. Volumes of working gas are reported in thousand cubic feet at standard temperature and pressure.|
For definitions of related energy terms, refer to the EIA Energy Glossary .
Please note that not all sector items collected on the EIA-176 will match the Natural Gas Annual.
|Sector Item||States where published data are from another source||Source of Published Items|
|Residential||FL, GA, MD, NJ, NY, OH, PA, VA||Published price for these States include data from the EIA-910, "Monthly Natural Gas Marketer Survey" as a component of prices. Beginning in 2011, published prices that include data for EIA-910 are GA, NY and OH. Volumes are from EIA-176 respondents.|
|Commercial||DC, GA, MD, MI, NY, OH, PA, VA||Published price for these States include data from the EIA-910, "Monthly Natural Gas Marketer Survey" as a component of prices. Beginning in 2011, published prices that include data for EIA-910 are GA, NY and OH. Volumes are from EIA-176 respondents.|
|Electric Power||All states||Electric Power sector data for volumes and prices are obtained from the EIA-923, "Power Plant Operation Report."|
|Vehicle Fuel||All states||Vehicle fuel volumes are obtained from the EIA-886, "Annual Survey of Alternative Fueled Vehicles" and EIA estimates. Vehicle fuel prices are from EIA-176 respondents.|
• As of January 2015, the Kimball and Columbus III reservoirs in Michigan are being reported under the Bluewater Gas Storage Field on a combined basis. In prior periods, they were reported separately.
• Base gas typically is calculated as the difference between Total Capacity and Working Gas Capacity for a given storage field. However, some fields operate at levels that differ from the certificated capacities as reported on Form EIA-191. As a result, base gas may be above or below the difference between total and working gas capacity.
If you have questions or need assistance, please contact Amy Sweeney at firstname.lastname@example.org or (202)586-2627.