Energy terminology · MLC-0117

Energy terms: M (150)

• MThousand
• Machine drive (motors)The direct process end use in which thermal or electric energy is converted into mechanical energy. Motors...
• Made available (vehicle)A vehicle is considered "Made available" if it is available for delivery to dealers or users, whether or not...
• MagmaNaturally occurring molten rock, generated within the earth and capable of intrusion and extrusion, from...
• Main heating equipmentEquipment primarily used for heating ambient air in the housing unit.
• Main heating fuelThe form of energy used most frequently to heat the largest portion of the floorspace of a structure. The...
• MainsA system of pipes for transporting gas within a distributing gas utility's retail service area to points of...
• Maintenance expensesThat portion of operating expenses consisting of labor, materials, and other direct and indirect expenses...
• Maintenance of boiler plant (expenses)The cost of labor, material, and expenses incurred in the maintenance of a steam plant. Includes furnaces...
• Maintenance of structures (expenses)The cost of labor, materials, and expenses incurred in maintenance of power production structures. Structures...
• Maintenance supervision and engineering expensesThe cost of labor and expenses incurred in the general supervision and direction of the maintenance of power...
• Major electric utilityA utility that, in the last 3 consecutive calendar years, had sales or transmission services exceeding one of...
• Major energy sourcesFuels or energy sources such as electricity, fuel oil, natural gas, district steam, district hot water, and...
• Major fuelsFuels or energy sources such as: electricity, fuel oil, liquefied petroleum gases, natural gas, district...
• Major interstate pipeline companyA company whose combined sales for resale, including gas transported interstate or stored for a fee, exceeded...
• Make-up airAir brought into a building from outside to replace exhaust air.
• MANE-VU (Mid-Atlantic/Northeast Visibility Union)An organization formed by the Mid-Atlantic and Northeastern states, tribes, and federal agencies to...
• Manhattan ProjectThe U.S. Government project that produced the first nuclear weapons during World War II. Started in 1942, the...
• Manual dimmer switchesThese are like residential-style dimmer switches. They are not generally used with fluorescent and...
• Manufactured gasA gas obtained by destructive distillation of coal or by the thermal decomposition of oil, or by the reaction...
• ManufacturingAn energy-consuming subsector of the industrial sector that consists of all facilities and equipment engaged...
• Manufacturing divisionOne of 10 fields of economic activity defined by the Standard Industrial Classification Manual. The...
• Manufacturing establishmentAn economic unit at a single physical location where mechanical or chemical transformation of materials or...
• MARAMA (Mid-Atlantic Regional Air Management Association, Inc.)A voluntary, non-profit association of ten Mid-Atlantic state and local air pollution control agencies...
• Marginal costThe change in cost associated with a unit change in quantity supplied or produced.
• Marine freightFreight transported over rivers, canals, the Great Lakes, and domestic ocean waterways.
• Market clearing priceThe price at which supply equals demand for the Day-ahead or hour-ahead markets.
• Market price contractA contract in which the price of uranium is not specifically determined at the time the contract is signed...
• Market price settlement (uranium)The price paid for uranium delivery under a market-price contract. The price is commonly (but not always)...
• Market-based pricingPrices of electric power or other forms of energy determined in an open market system of supply and demand...
• Marketed energyAn energy source that is commercially traded. Typically, this energy is sold by a producer, such as a...
• Marketed productionGross withdrawals less gas used for repressuring, quantities vented and flared, and nonhydrocarbon gases...
• MasonryA general term covering wall construction using masonry materials such as brick, concrete block, stone, and...
• Masonry stoveA type of heating appliance similar to a fireplace, but much more efficient and clean burning. They are made...
• Mass burn facilityA type of municipal solid waste (MSW) incineration facility in which MSW is burned with only minor presorting...
• Master-meteringMeasurement of electricity or natural gas consumption of several tenants or housing units using a single...
• Maximum deliverabilityThe maximum rate natural gas can be withdrawn from or injected into a storage field when filled to maximum...
• Maximum demandThe greatest of all demands of the load that has occurred within a specified period of time.
• Maximum dependable capacity, netThe gross electrical output measured at the output terminals of the turbine generator(s) during the most...
• Maximum established site capacity (reactors)The maximum established spent fuel capacity for the site is defined by DOE as the maximum number of intact...
• Maximum generator nameplate capacityThe maximum rated output of a generator, prime mover, or other electric power production equipment under...
• Maximum hourly loadThis is determined by the interval in which the 60-minute integrated demand is the greatest.
• Maximum streamflowThe maximum rate of water flow past a given point during a specified period.
• MBOEDmillion barrels of oil equivalent per day
• Mcfone thousand cubic feet
• Mean indoor temperatureThe "usual" temperature. If different sections of the house are kept at different temperatures, the reported...
• Mean operating hoursThe arithmetic average number of operating hours per building is the weighted sum of the number of operating...
• Mean power output (of a wind turbine)The average power output of a wind energy conversion system at a given mean wind speed based on a Raleigh...
• Mean square feet per buildingThe arithmetic average square feet per building is the weighted sum of the total square feet divided by the...
• Measured heated area of residenceThe floor area of the housing unit that is enclosed from the weather and heated. Basements are included...
• Measured resources, coalCoal resources for which estimates of the rank, quality, and quantity have been computed, within a margin of...
• MECSManufacturing Energy Consumption Survey
• MedianThe middle number of a data set when the measurements are arranged in ascending (or descending) order.
• Median streamflowThe middle rate of flow of water past a given point for which there have been several greater and lesser...
• Median water conditionThe middle precipitation and run-off condition for a distribution of water conditions that have happened over...
• Medium pressureFor valves and fittings, implies that they are suitable for working pressures between 125 to 175 pounds per...
• Medium-temperature collectorA collector designed to operate in the temperature range of 140 degrees to 180 degrees Fahrenheit, but that...
• MegavoltamperesMillions of voltamperes, which are a measure of apparent power. (See definition for apparent power.)
• MegawattOne million watts of electricity.
• Megawatt electricOne million watts of electric capacity.
• MegawatthourOne thousand kilowatt-hours or 1million watt-hours.
• MercaptansAlso known as thiols. Mercaptans are highly odorous sulfur-containing hydrocarbons that are often removed...
• Merchant coke plantA coke plant where coke is produced primarily for sale on the commercial (open) market.
• Merchant facilitiesHigh-risk, high-profit facilities that operate, at least partially, at the whims of the market, as opposed to...
• Merchant MTBE plantsMTBE (methyl tertiary butylether) production facilities primarily located within petrochemical plants rather...
• Merchant oxygenate plantsOxygenate production facilities that are not associated with a petroleum refinery. Production from these...
• Mercury vapor lampA high-intensity discharge lamp that uses mercury as the primary light-producing element. Includes clear...
• MergerA combining of companies or corporations into one, often by issuing stock of the controlling corporation to...
• MeroxAlso known as kerosene Merox or LPG Merox. The Merox unit is a proprietary technology owned by the Universal...
• MetAn approximate unit of heat produced by a resting person, equal to about 18.5 Btu per square foot per hour.
• Metal halide lampA high-intensity discharge lamp type that uses mercury and several halide additives as light-producing...
• MetallicThe metallic material composition of the collector's absorber system.
• Metallurgical coalCoking coal and pulverized coal consumed in making steel.
• Metered dataEnd-use data obtained through the direct measurement of the total energy consumed for specific uses within...
• Metered peak demandThe presence of a device to measure the maximum rate of electricity consumption per unit of time. This device...
• Methane (CH_4)A colorless, flammable, odorless hydrocarbon gas which is the major component of natural gas. It is also an...
• MethanogensBacteria that synthesize methane, requiring completely anaerobic conditions for growth.
• Methanol blendMixtures containing 85 percent or more (or such other percentage, but not less than 70 percent) by volume of...
• Methanol (CH_3OH)A light, volatile alcohol eligible for gasoline blending.
• MethanotrophsBacteria that use methane as food and oxidize it into carbon dioxide.
• Methyl chloroform (trichloroethane)An industrial chemical (CH_3CC_(l3)) used as a solvent, aerosol propellant, and pesticide and for metal...
• Methylene chlorideA colorless liquid, nonexplosive and practically nonflammable. Used as a refrigerant in centrifugal...
• Metric conversion factors (for floorspace)Floorspace estimates may be converted to metric units by using the relationship, 1 square foot is...
• Metric ton (mt)A unit of weight equal to 2,204.6 pounds.
• MetropolitanLocated within the boundaries of a metropolitan area.
• Metropolitan areaA geographic area that is a metropolitan statistical area or a consolidated metropolitan statistical area as...
• Metropolitan statistical areaA county or group of contiguous counties (towns and cities in New England) that has (1) at least one city...
• Microcrystalline waxWax extracted from certain petroleum residues having a finer and less apparent crystalline structure than...
• MicrogrooveA small groove scribed into the surface of a solar photovoltaic cell which is filled with metal for contacts.
• Micrometer (or Micron)One-millionth of a meter. It can also be expressed as 10-6 meter.
• Microwave ovenA household cooking appliance consisting of a compartment designed to cook or heat food by means of microwave...
• Middle distillatesA general classification of refined petroleum products that includes distillate fuel oil and kerosene.
• MiddlingsIn coal preparation, this material called mid-coal is neither clean nor refuse; due to their intermediate...
• Midgrade gasolineGasoline having an antiknock index, i.e., octane rating, greater than or equal to 88 and less than or equal...
• Mid-size passenger carA passenger car with between110 and 119 cubic feet of interior passenger and luggage volume.
• Miles per gallonA measure of vehicle fuel efficiency. Miles per gallon or MPG represents "Fleet Miles per Gallon. "For each...
• Military useIncludes sales to the Armed Forces, including volumes sold to the Defense Fuel Supply Center (DFSC) for use...
• MillA monetary cost and billing unit used by utilities; it is equal to 1/1000 of the U.S. dollar (equivalent to...
• Mill capitalCost for transportation and equipping a plant for processing ore or other feed materials.
• Mill feedUranium ore supplied to a crusher or grinding mill in an ore-dressing process.
• MillingThe grinding or crushing of ore, concentration, and other beneficiation, including the removal of valueless...
• Milling capacityThe maximum rate at which a mill is capable of treating ore or producing concentrate.
• Milling of uraniumThe processing of uranium from ore mined by conventional methods, such as underground or open-pit methods, to...
• Million British Thermal UnitsMMBtu. See Btu.
• MinableCapable of being mined under current mining technology and environmental and legal restrictions, rules, and...
• Mine capitalCost for exploration and development, pre-mining stripping, shaft sinking, and mine development (including...
• Mine countThe number of mines, or mines collocated with preparation plants or tipples, located in a particular...
• MineralAny of the various naturally occurring in organic substances, such as metals, salt, sand, stone, sulfur, and...
• Mineral leaseAn agreement wherein a mineral interest owner (lessor) conveys to another party (lessee) the rights to...
• Mineral rightsThe ownership of the minerals beneath the earth's surface with the right to remove them. Mineral rights may...
• Mineral-matter-free basisMineral matter in coal is the parent material in coal from which ash is derived and which comes from minerals...
• Minimum streamflowThe lowest rate of flow of water past a given point during a specified period.
• MiningAn energy-consuming subsector of the industrial sector that consists of all facilities and equipment used to...
• Mining operationOne mine and/or tipple at a single physical location.
• MinivanSmall van that first appeared with that designation in 1984. Any of the smaller vans built on an...
• Minority carrierA current carrier, either an electron or a hole, that is in the minority in a specific layer of a...
• Miscellaneous petroleum productsIncludes all finished products not classified elsewhere (e.g., petrolatum lube refining by products (aromatic...
• Miscellaneous reservesA supply source having not more than 50 billion cubic feet of dedicated recoverable salable reserves and that...
• Mixed wasteWaste containing both radioactive and hazardous constituents.
• MMMillion (10^6).
• MMb/dOne million (10^6) barrels of oil per day.
• MMBtuOne million (10^6) British thermal units.
• MMcfOne million (10^6) cubic feet.
• MMgal/dOne million (10^6) gallons per day.
• MMmtOne million (10^6 ) metric tons.
• MMstOne million (10^6) short tons.
• Mobile homeA housing unit built on a movable chassis and moved to the site. It may be placed on a permanent or temporary...
• ModeratorA material, such as ordinary water, heavy water, or graphite, used in a reactor to slow down high-velocity...
• ModulesPhotovoltaic cells or an assembly of cells into panels (modules) intended for and shipped for final...
• Moist (coal) basisMoist coal contains its natural inherent or bed moisture, but does not include water adhering to the surface...
• Moisture contentThe water content of a substance (a solid fuel) as measured under specified conditions being the "dry basis,"...
• MoleThe quantity of a compound or element that has a weight in grams numerically equal to its molecular weight...
• Montreal protocolThe Montreal Protocol on Substances that Deplete the Ozone Layer (1987). An international agreement, signed...
• Motor gasoline blendingMechanical mixing of motor gasoline blending components, and oxygenates when required, to produce finished...
• Motor gasoline blending componentsNaphthas (e.g., straight-run gasoline, alkylate, reformate, benzene, toluene, xylene) used for blending or...
• Motor gasoline (finished)A complex mixture of relatively volatile hydrocarbons with or without small quantities of additives, blended...
• Motor speedThe number of revolutions that the motor turns in a given time period (i.e. revolutions per minute, rpm).
• MPG shortfallThe difference between actual on-road MPG and EPA laboratory test MPG. MPG short fall is expressed as gallons...
• MSHAMine Safety and Health Administration
• MSHA ID numberSeven (7)-digit code assigned to a mining operation by the Mine Safety and Health Administration.
• MTBEMethyl Tertiary Butyl Ether
• MTBE (methyl tertiary butyl ether) (CH_3)_3COCH_3An ether intended for gasoline blending as described in "Oxygenates."
• Multiple completion wellA well equipped to produce oil and/or gas separately from more than one reservoir. Such wells contain...
• Multiple croppingA system of growing several crops on the same field in one year.
• Multiple purpose projectThe development of hydroelectric facilities to serve more than one function. Some of the uses include...
• Multiple purpose reservoirStored water and its usage governed by advanced water resource conservation practices to achieve more than...
• Municipal solid wasteGarbage collected from municipalities or a similar customer base (including a mix of residential and...
• Municipal wasteAs defined in the Energy Security Act (P.L. 96-294; 1980) as "any organic matter, including sewage, sewage...
• Municipal waste to energy project or plantA facility that produces fuel or energy from municipal solid waste.
• MunicipalityA village town, city, county, or other political subdivision of a State.

150 of 2,515 terms in Energy terminology (MLC-0117). Request the full dataset.