wind energy terminologies

7/28/2019 Wind Energy Terminologies

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Wheeling charge: An amount charged by one electrical system to transmit the energy of,

and for, another system or systems.

Wheeling service: The movement of electricity from one system to another overtransmission facilities of interconnecting systems. Wheeling service contracts can be

established between two or more systems.

Wholesale transmission services: The transmission of electric energy sold, or to be sold,

in the wholesale electric power market.

Wholesale wheeling: An arrangement in which electricity is transmitted from agenerator to a utility through the transmission facilities of an intervening system.

Wind energy: Kinetic energy present in wind motion that can be converted to

mechanical energy for driving pumps, mills, and electric power generators.

Wind energy conversion system (WECS) or device: An apparatus for converting theenergy available in the wind to mechanical energy that can be used to power machinery

(grain mills, water pumps) and to operate an electrical generator.

Wind farm: See Wind power plant below.

Wind power plant: A group of wind turbines interconnected to a common utility system

through a system of transformers, distribution lines, and (usually) one substation.Operation, control, and maintenance functions are often centralized through a network of

computerized monitoring systems, supplemented by visual inspection. This is a term

commonly used in the United States. In Europe, it is called a generating station.

Wind turbine: Wind energy conversion device that produces electricity; typically three

blades rotating about a horizontal axis and positioned up-wind of the supporting tower.

Wires charge: A broad term referring to fees levied on power suppliers or their

customers for the use of the transmission or distribution wires.

Backup generator: A generator that is used only for test purposes, or in the event of anemergency, such as a shortage of power needed to meet customer load requirements.

Backup power: Electric energy supplied by a utility to replace power and energy lost

during an unscheduled equipment outage.

Base load: The minimum amount of electric power delivered or required over a givenperiod of time at a steady rate.

Base load capacity: The generating equipment normally operated to serve loads on an

around-the-clock basis.


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Base load plant: A plant, usually housing high-efficiency steam-electric units, which is

normally operated to take all or part of the minimum load of a system, and which

consequently produces electricity at an essentially constant rate and runs continuously.These units are operated to maximize system mechanical and thermal efficiency and

minimize system operating costs.

Base period: The period of time for which data used as the base of an index number, or

other ratio, have been collected. This period is frequently one of a year but it may be asshort as one day or as long as the average of a group of years. The length of the base

period is governed by the nature of the material under review, the purpose for which the

index number (or ratio) is being compiled, and the desire to use a period as free aspossible from abnormal influences in order to avoid bias.

Base rate: A fixed kilowatthour charge for electricity consumed that is independent of

other charges and/or adjustments.

Baseboard heater: As a type of heating equipment, a system in which either electricresistance coils or finned tubes carrying steam or hot water are mounted behind shallow

panels along baseboards. Baseboards rely on passive convection to distribute heated air in

the space. Electric baseboards are an example of an "Individual Space Heater." (Also see

Individual Space Heater.)

Barrel: A unit of volume equal to 42 U.S. gallons.

Billing period: The time between meter readings. It does not refer to the time when the

bill was sent or when the payment was to have been received. In some cases, the billingperiod is the same as the billing cycle that corresponds closely (within several days) to

meter-reading dates. For fuel oil and LPG, the billing period is the number of days

between fuel deliveries.

Bunker fuels: Fuel supplied to ships and aircraft, both domestic and foreign, consisting

primarily of residual and distillate fuel oil for ships and kerosene-based jet fuel for

aircraft. The term "international bunker fuels" is used to denote the consumption of fuelfor international transport activities. Note: For the purposes of greenhouse gas emissions

inventories, data on emissions from combustion of international bunker fuels are

subtracted from national emissions totals. Historically, bunker fuels have meant only shipfuel.

Bus: An electrical conductor that serves as a common connection for two or more

electrical circuits.

Capacity factor: The ratio of the electrical energy produced by a generating unit for the

period of time considered to the electrical energy that could have been produced atcontinuous full power operation during the same period.


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Capacity transaction: The acquisition of a specified quantity of generating capacity

from another utility for a specified period of time. The utility selling the power is

obligated to make available to the buyer a specified quantity of power.

Capacity utilization: Capacity utilization is computed by dividing production by

productive capacity and multiplying by 100.

Carbon budget: The balance of the exchanges (incomes and losses) of carbon between

carbon sinks (e.g., atmosphere and biosphere) in the carbon cycle. Also see Carbon cycleand Carbon sinkbelow.

Carbon cycle: All carbon sinks and exchanges of carbon from one sink to another by

various chemical, physical, geological, and biological processes. Also see Carbon sink

below.

Carbon dioxide (CO2): A colorless, odorless, non-poisonous gas that is a normal part of

Earth's atmosphere. Carbon dioxide is a product of fossil-fuel combustion as well as otherprocesses. It is considered a greenhouse gas as it traps heat (infrared energy) radiated by

the Earth into the atmosphere and thereby contributes to the potential for global warming.The global warming potential (GWP) of other greenhouse gases is measured in relation to

that of carbon dioxide, which by international scientific convention is assigned a value of

one (1). Also see Global warming potential (GWP) and Greenhouse gases.

Carbon dioxide equivalent: The amount of carbon dioxide by weight emitted into theatmosphere that would produce the same estimated radiative forcing as a given weight of

another radiatively active gas. Carbon dioxide equivalents are computed by multiplying

the weight of the gas being measured (for example, methane) by its estimated global

warming potential (which is 21 for methane). "Carbon equivalent units" are defined ascarbon dioxide equivalents multiplied by the carbon content of carbon dioxide (i.e.,

12/44).

Carbon flux: See Carbon budget above.

Carbon intensity: The amount of carbon by weight emitted per unit of energy

consumed. A common measure of carbon intensity is weight of carbon per British

thermal unit (Btu) of energy. When there is only one fossil fuel under consideration, the

carbon intensity and the emissions coefficient are identical. When there are several fuels,carbon intensity is based on their combined emissions coefficients weighted by their

energy consumption levels. Also see Emissions coefficient and Carbon output rate.

Carbon output rate: The amount of carbon by weight per kilowatthour of electricity

produced.

Carbon sequestration: The fixation of atmospheric carbon dioxide in a carbon sink

through biological or physical processes.


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Carbon sink: A reservoir that absorbs or takes up released carbon from another part of

the carbon cycle. The four sinks, which are regions of the Earth within which carbon

behaves in a systematic manner, are the atmosphere, terrestrial biosphere (usuallyincluding freshwater systems), oceans, and sediments (including fossil fuels).

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