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Aquifer Storage Field	A sub-surface facility for storing natural gas, consisting of water-bearing sands topped by an impermeable cap rock.
Balancing Item	Represents the difference between the sum of the components of natural gas supply and the sum of the components of natural gas disposition. These differences may be due to data reporting or survey coverage problems. Reporting problems include differences due to the net result of conversions of flow data metered at varying temperature and pressure bases and converted to a standard temperature and pressure base; the effect of variations in company accounting and billing practices; differences between billing cycle and calendar period time frames; and imbalances resulting from the merger of data reporting systems which vary in scope, format, definitions, and type of respondents. Survey problems include incomplete survey frames, problems in sampling design, or response problems.
Base (Cushion) Gas	The volume of gas needed as a permanent inventory to maintain adequate underground storage reservoir pressures and deliverability rates throughout the withdrawal season. All native gas is included in the base gas volume.
City-gate	A point or measuring station at which a gas distribution company receives gas from a pipeline company or transmission system.
Commercial Consumption	Gas used by nonmanufacturing establishments or agencies primarily engaged in the sale of goods or services such as hotels, restaurants, wholesale and retail stores and other service enterprises; and gas used by local, State and Federal agencies engaged in nonmanufacturing activities.
Depleted Storage Field	A sub-surface natural geological reservoir, usually a depleted oil or gas field, used for storing natural gas.
Dry Natural Gas Production	Marketed production less extraction loss.
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 22 plants. Combined heat and power plants that identify themselves as primarily in the commercial or industrial sectors are reported in those sectors.
Electric Utility	A corporation, person, agency, authority, or other legal entity or instrumentality aligned with distribution facilities for delivery of electric energy for use primarily by the public. Included are investor-owned electric utilities, municipal and State utilities, Federal electric utilities, and rural electric cooperatives. A few entities that are tariff based and corporately aligned with companies that own distribution facilities are also included. Note Due to the issuance of FERC Order 888 that required traditional electric utilities to functionally unbundle their generation, transmission, and distribution operations, "electric utility" currently has inconsistent interpretations from State to State.
Exports	Natural gas deliveries out of the continental United States and Alaska to foreign countries.
Extraction Loss	The reduction in volume of natural gas resulting from the removal of natural gas liquid constituents at natural gas processing plants.
Flared	The volume of gas burned in flares on the base site or at gas processing plants.
Gas Condensate Well	A gas well that produces from a gas reservoir containing considerable quantities of liquid hydrocarbons in the pentane and heavier range generally described as "condensate."
Gas Well	A well completed for the production of natural gas from one or more gas zones or reservoirs.
Gross Withdrawals	Full well stream volume, including all natural gas plant liquid and nonhydrocarbon gases, but excluding lease condensate. Also includes amounts delivered as royalty payments or consumed in field operations.
Heating Value	The average number of British thermal units per cubic foot of natural gas as determined from tests of fuel samples.
Imports	Natural gas received in the Continental United States (including Alaska) from a foreign country.
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, fisheries and construction.
Intransit Deliveries	Redeliveries to a foreign country of foreign gas received for transportation across U.S. territory and deliveries of U.S. gas to a foreign country for transportation across its territory and redelivery to the United States.
Intransit Receipts	Receipts of foreign gas for transportation across U.S. territory and redelivery to a foreign country and redeliveries to the United States of U.S. gas transported across foreign territory.
Lease and Plant Fuel	Natural gas used in well, field, lease operations and as fuel in natural gas processing plants.
Liquefied Natural Gas (LNG)	Natural gas that has been liquefied by reducing its temperature to minus 260 degrees Fahrenheit at atmospheric pressure.
Marketed Production	Gross withdrawals less gas used for repressuring, quantities vented and flared, and nonhydrocarbon gases removed in treating or processing operations. Includes all quantities of gas used in field and processing operations. See Explanatory Note 1 for discussion of coverage of data concerning nonhydrocarbon gases removed.
Native Gas	Gas in place at the time that a reservoir was converted to use as an underground storage reservoir as in contrast to injected gas volumes.
Natural Gas	A mixture of hydrocarbon compounds and small quantities of various nonhydrocarbons existing in the gaseous phase or solution with oil in natural underground reservoirs at reservoir conditions.
Nonhydrocarbon Gases	Typical nonhydrocarbon gases that may be present in reservoir natural gas are carbon dioxide, helium, hydrogen sulfide, and nitrogen.
Oil Well (Casinghead) Gas	Associated and dissolved gas produced along with crude oil from oil completions.
Onsystem Sales	Sales to customers where the delivery point is a point on, or directly interconnected with, a transportation, storage, and/or distribution system operated by the reporting company.
Pipeline Fuel	Gas consumed in the operation of pipelines, primarily in compressors.
Repressuring	The injection of gas into oil or gas formations to effect greater ultimate recovery.
Residential Consumption	Gas used in private dwellings, including apartments, for heating, cooking, water heating, and other household uses.
Salt Cavern Storage Field	A storage facility that is a cavern hollowed out in either a salt Abed@ or "dome" formation.
Storage Additions	The volume of gas injected or otherwise added to underground natural gas or liquefied natural gas storage during the applicable reporting period.
Storage Withdrawals	Synthetic natural gas, propane-air, refinery gas, biomass gas, air injected for stabilization of heating content, and manufactured gas commingSynthetic natural gas, propane-air, refinery gas, biomass gas, air injected for stabilization of heating content, and manufactured gas commingled and distributed with natural gas.
Synthetic Natural Gas (SNG)	A manufactured product chemically similar in most respects to natural gas, that results from the conversion or reforming of petroleum hydrocarbons and may easily be substituted for or interchanged with pipeline quality natural gas.
Underground Gas Storage Reservoir Capacity	Interstate company reservoir capacities are those certificated by FERC. Independent producer and intrastate company reservoir capacities are reported as developed capacity.
Vehicle Fuel Consumption	Natural gas (compressed or liquefied) used as vehicle fuel.
Vented Gas	Gas released into the air on the base site or at processing plants.
Wellhead Price	Represents the wellhead sales price, including charges for natural gas plant liquids subsequently removed from the gas, gathering and compression charges, and State production, severance, and/or similar charges.
Working (Top Storage) Gas	The volume of gas in an underground storage reservoir above the designed level of the base. 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.

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