NA Not available.
1 Change from immediate prior year except for 1970, change from 1960.For explanation of average annual percent change, see Guide toTabular Presentation.
2 Net summer capability is the steady hourly output that generatingequipment is expected to supply to system load, exclusive of auxiliarypower as demonstrated by test at the time of summer peak demand.
3 Includes small percentage (.5%) from wood and waste, geothermal, andand petroleum coke.
4 A prime mover is the engine, turbine, water wheel, or similar machinewhich drives an electric generator.
5 Fossil fuels only.
6 Includes wind, solar thermal, photovoltaic and combined cycle not shown separately.
7 Includes fossil steam, wood, and waste.
8 Each prime mover type in combination plants counted separately.Includes geothermal, wind, and solar, not shown separately.
9 Includes small amounts of wood, waste, wind, geothermal, solarthermal, and photovoltaic.Source: 1970, U.S. Federal Power Commission, Electric Power Statistics,and press releases; thereafter, U.S. Energy Information Administration,1975 and 1980, Power Production, Fuel Consumption, and InstalledCapacity Data-Annual, and unpublished data; thereafter, Electric PowerAnnual, Annual Energy Review, and unpublished data.http://www.eia.doe.gov/bookshelf/electric.htmlTERMS

Electric Utility: A corporation, person, agency, authority, or other legal entity orinstrumentality that owns and/or operates facilities within the United States, itsterritories, or Puerto Rico for the generation, transmission, distribution, or sale ofelectric energy primarily for use by the public and files forms listed in the Code ofFederal Regulations, Title 18, Part 141. Facilities that qualify as cogenerators orsmall power producers under the Public Utility Regulatory Policies Act (PURPA) arenot considered electric utilities.

Energy: The capacity for doing work as measured by the capability of doing work(potential energy) or the conversion of this capability to motion (kinetic energy).Energy has several forms, some of which are easily convertible and can be changedto another form useful for work. Most of the world's convertible energy comes fromfossil fuels that are burned to produce heat that is then used as a transfer medium tomechanical or other means in order to accomplish tasks. Electrical energy is usuallymeasured in kilowatthours, while heat energy is usually measured in British thermalunits.

Gas Turbine Plant: A plant in which the prime mover is a gas turbine. A gas turbineconsists typically of an axial-flow air compressor, one or more combustion chambers,where liquid or gaseous fuel is burned and the hot gases are passed to the turbine andwhere the hot gases expand to drive the generator and are then used to run thecompressor.

Generating Unit: Any combination of physically connected generator(s), reactor(s),boiler(s), combustion turbine(s), or other prime mover(s) operated together toproduce electric power.

Generation (Electricity): The process of producing electric energy by transformingother forms of energy; also, the amount of electric energy produced, expressed inwatthours (Wh).

Gross Generation: The total amount of electric energy produced by the generatingunits at a generating station or stations, measured at the generator terminals.

Net Generation: Gross generation less the electric energy consumed at thegenerating station for station use.

Geothermal Plant: A plant in which the prime mover is a steam turbine. The turbineis driven either by steam produced from hot water or by natural steam that derives itsenergy from heat found in rocks or fluids at various depths beneath the surface of theearth. The energy is extracted by drilling and/or pumping.

Hydroelectric Plant: A plant in which the turbine generators are driven by fallingwater.

Internal Combustion Plant: A plant in which the prime mover is an internalcombustion engine. An internal combustion engine has one or more cylinders in whichthe process of combustion takes place, converting energy released from the rapidburning of a fuel-air mixture into mechanical energy. Diesel or gas-fired engines arethe principal types used in electric plants. The plant is usually operated duringperiods of high demand for electricity.

Net Generation: Gross generation minus plant use from all electric utility ownedplants. The energy required for pumping at a pumped-storage plant is regarded asplant use and must be deducted from the gross generation.

Net Summer Capability: The steady hourly output, which generating equipment isexpected to supply to system load exclusive of auxiliary power, as demonstrated bytests at the time of summer peak demand.

Nonutility Power Producer: A corporation, person, agency, authority, or other legalentity or instrumentality that owns electric generating capacity and is not an electricutility. Nonutility power producers include qualifying cogenerators, qualifying smallpower pro ducers, and other nonutility generators (including independent powerproducers) without a designated franchised service area, and which do not file formslisted in the Code of Federal Regulations, Title 18, Part 141.

Nuclear Fuel: Fissionable materials that have been enriched to such a compositionthat, when placed in a nuclear reactor, will support a self-sustaining fission chainreaction, producing heat in a controlled manner for process use.

Nuclear Power Plant: A facility in which heat produced in a reactor by the fissioningof nuclear fuel is used to drive a steam turbine.

Operable Nuclear Unit: A nuclear unit is :q.operable:eq. after it completeslow-power testing and is granted authorization to operate at full power. This occurswhen it receives its full power amendment to its operating license from the NuclearRegulatory Commission.

Power: The rate at which energy is transferred. Electrical energy is usually measuredin watts. Also used for a measurement of capacity.

Price: The amount of money or consideration-in-kind for which a service is bought,sold, or offered for sale.

Prime Mover: The engine, turbine, water wheel, or similar machine that drives anelectric generator; or, for reporting purposes, a device that converts energy toelectricity directly (e.g., photovoltaic solar and fuel cell(s)).

Retail: Sales covering electrical energy supplied for residential, commercial, andindustrial end-use purposes. Other small classes, such as agriculture and streetlighting, also are included in this category.

Revenue: The total amount of money received by a firm from sales of its productsand/or services, gains from the sales or exchange of assets, interest and dividendsearned on investments, and other increases in the owner's equity except those arisingfrom capital adjustments.

Sales: The amount of kilowatthours sold in a given period of time; usually grouped byclasses of service, such as residential, commercial, industrial, and other. Other salesinclude public street and highway lighting, other sales to public authorities andrailways, and interdepartmental sales.

Steam-Electric Plant (Conventional): A plant in which the prime mover is a steamturbine. The steam used to drive the turbine is produced in a boiler where fossil fuelsare burned.

Turbine: A machine for generating rotary mechanical power from the energy of astream of fluid (such as water, steam, or hot gas). Turbines convert the kinetic energyof fluids to mechanical energy through the principles of impulse and reaction, or amixture of the two.