Energy terminology · MLC-0117
Energy terms: I (92)
- Identified resourcesCoal deposits whose location, rank, quality, and quantity are known from geologic evidence supported by...
- Idle capacityThe component of operable capacity that is not in operation and not under active repair, but capable of being...
- IEAInternational Energy Agency
- ImpedanceThe opposition to power flow in an AC circuit. Also, any device that introduces such opposition in the form...
- Implicit price deflatorThe implicit price deflator, published by the U.S. Department of Commerce, Bureau of Economic Analysis, is...
- Implied heat rateA calculation of the day-ahead electric price divided by the day-ahead natural gas price. Implied heat rate...
- Imported crude oil burned as fuelThe amount of foreign crude oil burned as a fuel oil, usually as residual fuel oil, without being processed...
- Imported Refiners' Acquisition CostThe average price for imported oil paid by U.S. refiners.
- ImportsReceipts of goods into the 50 States and the District of Columbia from U.S. possessions and territories or...
- Improved recoveryExtraction of crude oil or natural gas by any method other than those that rely primarily on natural...
- In situ leach miningThe recovery, by chemical leaching, of the valuable components of a mineral deposit without physical...
- Inadvertent power exchangeAn unintended power exchange among utilities that is either not previously agreed upon or in an amount...
- Incandescent lampA glass enclosure in which light is produced when a tungsten filament is electrically heated so that it...
- Incandescent light bulbs, including regular or energy-efficient light bulbsAn incandescent bulb is a type of electric light in which light is produced by a filament heated by electric...
- Incentives Demand-Side Management (DSM) program assistanceThis DSM program assistance offers monetary or non-monetary awards to encourage consumers to buy...
- Incremental effectsThe annual changes in energy use (measured in megawatt hours) and peak load (measured in kilowatts) caused by...
- Incremental energy costsThe additional cost of producing and/or transmitting electric energy above some previously determined base...
- Independent power producerA corporation, person, agency, authority, or other legal entity or instrumentality that owns or operates...
- Independent system operatorAn independent, federally regulated entity established to coordinate regional transmission in a...
- Indian coal leaseA lease granted to a mining company to produce coal from Indian lands in exchange for royalties and other...
- Indicated resources, coalCoal for which estimates of the rank, quality, and quantity are based partly on sample analyses and...
- Indirect costCosts not directly related to mining or milling operations, such as overhead, insurance, security, office...
- Indirect uses (end-use category)The end-use category that handles boiler fuel. Fuel in boilers is transformed into another useful energy...
- Indirect utility costA utility cost that may not be meaning fully identified with any particular DSM program category. Indirect...
- Industrial productionThe Federal Reserve Board calculates this index by compiling indices of physical output from a variety of...
- Industrial restrictions (coal)Land-use restrictions that constrain, postpone, or prohibit mining in order to meet other industrial needs or...
- Industrial sectorAn energy-consuming sector that consists of all facilities and equipment used for producing, processing, or...
- Inferred reserve base (coal)the resources in the inferred reliability category that meet the same criteria of bed thickness and depth...
- Inferred resourcesCoal in unexplored extensions of demonstrated resources for which estimates of the quality and size are based...
- In-house Demand-Side Management (DSM) program sponsorThe building's owner or management encourages consumers in the building to improve energy efficiency, reduce...
- Initial enrichmentAverage enrichment for a fresh fuel assembly as specified and ordered in fuel cycle planning. This average...
- Initial operationFirst availability of a newly constructed unit to provide power to the grid. For a nuclear unit, this time is...
- Inoperable capacityGenerating capacity that is totally or partially out of service at the time of system peak load, either for...
- Instantaneous peak demandThe maximum demand at the instant of greatest load.
- Instantaneous water heaterAlso called a "tankless" or "point-of-use" water heater. The water is heated at the point of use as it is...
- Institutional living quartersSpace provided by a business or organization for long-term housing of individuals whose reason for shared...
- InsulationAny material or substance that provides a high resistance to the flow of heat from one surface to another...
- Insulation around heating and/or cooling ductsExtra insulation around the heating and/or cooling ducts intended to reduce the loss of hot or cold air as it...
- Insulation around hot-water pipesWrapping of insulating material around hot-water pipes to reduce the loss of heat through the pipes.
- Insulation around water heaterBlanket insulation wrapped around the water heater to reduce loss of heat. To qualify under this definition...
- InsulatorA material that is a very poor conductor of electricity. The insulating material is usually a ceramic or...
- Intangible drilling and development costsCosts incurred in preparing well locations, drilling and deepening wells, and preparing wells for initial...
- Integral collector storageA solar thermal collector in which incident solar radiation is absorbed directly by the storage medium.
- Integrated demandThe summation of the continuously varying instantaneous demand averaged over a specified interval of time...
- Integrated gasification-combined cycle technologyCoal, water, and oxygen are fed to gasifier, which produces syngas. This medium-Btu gas is cleaned...
- IntensityThe amount of a quantity per unit floor space. This method adjusts either the amount of energy consumed or...
- Intensity per hourTotal consumption of a particular fuel(s) divided by the total floor space of buildings that use the fuel(s)...
- InterburdenMaterial of any nature that lies between or separates coal seams. Term is primarily used in surface mining.
- Interchange authority (electric)The responsible entity that authorizes implementation of valid and balanced Interchange Schedules between...
- Interchange (electric)Energy transfers that cross Balancing Authority boundaries. NERC definition
- Interchange energyKilowatthours delivered to or received by one electric utility or pooling system from another. Settlement may...
- Interchange transaction (electric)An agreement to transfer energy from a seller to a buyer that crosses one or more Balancing Authority Area...
- Intercity busA bus designed for high speed, long distance travel; equipped with front doors only, high backed seats, and...
- Interconnected systemA system consisting of two or more individual power systems normally operating with connecting tie lines.
- InterconnectionTwo or more electric systems having a common transmission line that permits a flow of energy between them...
- Interdepartmental salesIncludes amounts charged by the electric department at tariff or other specified rates for electricity...
- Interdepartmental service (electric)Interdepartmental service includes amounts charged by the electric department at tariff or other specified...
- Interest coverage ratioThe number of times that fixed interest charges were earned. It indicates the margin of safety of interest on...
- Intergovernmental Panel on Climate ChangeA panel established jointly in 1988 by the World Meteorological Organization and the United Nations...
- Interlocking directoratesThe holding of a significant position in management or a position on the corporate board of a utility while...
- Intermediate grade gasolineA grade of unleaded gasoline with an octane rating intermediate between "regular" and "premium." Octane...
- Intermediate load (electric system)The range from base load to a point between base load and peak. This point may be the midpoint, a percent of...
- Intermittent electric generator or intermittent resourceAn electric generating plant with output controlled by the natural variability of the energy resource rather...
- Internal Collector StorageA solar thermal collector in which incident solar radiation is absorbed by the storage medium.
- Internal combustion engineGenerates mechanical power by burning a liquid, such as gasoline, diesel, or biofuels, or a gaseous fuel...
- Internal combustion plantA plant in which the prime mover is an internal combustion engine. An internal combustion engine has one or...
- Interruptible gasGas sold to customers with a provision that permits curtailment or cessation of service at the discretion of...
- Interruptible loadThis Demand-Side Management category represents the consumer load that, in accordance with contractual...
- Interruptible load or interruptible demand (electric)Demand that the end-use customer makes available to its Load-Serving Entity via contract or agreement for...
- Interruptible or curtailable rateA special electricity or natural gas arrangement under which, in return for lower rates, the customer must...
- Interruptible powerPower and usually the associated energy made available by one utility to another. This transaction is subject...
- Interstate companiesNatural gas pipeline companies subject to Federal Energy Regulatory Commission (FERC) jurisdiction.
- Interstate pipelineAny person engaged in natural gas transportation subject to the jurisdiction of Federal Energy Regulatory...
- Interstate pipeline purchaseAny gas supply contracted from and volumes purchased from other interstate pipelines, overland natural gas...
- Intransit deliveriesRedeliveries to a foreign country of foreign gas received for transportation across U.S. territory, and...
- Intransit receiptsReceipts of foreign gas for transportation across U.S. territory and redelivery to a foreign country, and...
- Intrastate companiesCompanies not subject to Federal Energy Regulatory Commission (FERC) jurisdiction.
- Intrastate pipelineAny person engaged in natural gas transportation (not including gathering) that is not subject to the...
- In-use (vehicles)Implies that a vehicle is:
- Investment of municipalityThe investment of the municipality in its utility department, when such investment is not subject to cash...
- Investments and advances to unconsolidated affiliatesThe balance sheet account representing the cost of investments and advances to unconsolidated affiliates...
- Investor-owned utilityA privately-owned electric utility whose stock is publicly traded. It is rate regulated and authorized to...
- Ion exchangeReversible exchange of ions adsorbed on a mineral or synthetic polymer surface with ions in solution in...
- Iron and steel industrySteel Works, Blast Furnaces (Including Coke Ovens), and Rolling Mills Establishments primarily engaged in...
- Irradiated nuclear fuelNuclear fuel that has been exposed to radiation in the reactor core at any power level.
- Isobutane (C_4H_(10))A branch-chain saturated (paraffinic) hydrocarbon extracted from both natural gas and refinery gas streams...
- Isobutylene (C_4H_8)A branch-chain olefinic hydrocarbon recovered from refinery or petrochemical processes, which is gaseous at...
- Isohexane (C_6H_(14))A saturated branch-chain hydrocarbon. It is a colorless liquid that boils at a temperature of 156.2 degrees...
- IsomerizationA refining process that alters the fundamental arrangement of atoms in the molecule without adding or...
- IsopachA line on a map drawn through points of equal thickness of a designated unit (such as a coal bed).
- IsopentaneA saturated branched-chain hydrocarbon (C_5H_(12)) obtained by fractionation of natural gasoline or...
- IsotopesForms of the same chemical element that differ only by the number of neutrons in their nucleus. Most elements...
92 of 2,515 terms in Energy terminology (MLC-0117). Request the full dataset.