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Definitions (68)

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embedded cost


The fixed cost of all facilities in the power supply system, including generating plants, substations and distribution lines.
Source: nwppa.org

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aggregators


Brokers who seek to bring together customers to create a “load” so that they can buy power in bulk, making a profit on the sale.
Source: nwppa.org

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alternating current


An electric current that reverses direction of flow at regular intervals and has alternately positive and negative values.
Source: nwppa.org

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anadromous fish


Fish (such as salmon and steelhead) that hatch in freshwater, migrate to the ocean, mature there, and return to freshwater to spawn.
Source: nwppa.org

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ancillary services


Includes the provision of reactive power, frequency control and load following.
Source: nwppa.org

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automatic generation control


Regulation of the power output of electric generators within a control area in response to changes in load, system frequency and other factors, to maintain the scheduled system frequency and interchanges with other control areas.
Source: nwppa.org

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average annual megawatt or average megawatt


A unit of energy output over a year that is equal to the energy produced by the continuous operation of one megawatt of capacity over a period of time. (Equal to 8,760 megawatt-hours).
Source: nwppa.org

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average cost pricing


A pricing mechanism based on dividing the total cost of providing electricity incurred in a period by the number of units sold in the same period.
Source: nwppa.org

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average system cost


The cost of a utility’s generation and transmission system. Under the Residential Exchange provisions of the Northwest Power Act, a utility may sell power to BPA at the utility’s average system cost and purchase the same amount of power back from BPA at a rate based on the costs of the Federal Base System.
Source: nwppa.org

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avoided cost


A guideline for comparing the value of conservation and renewable resources with other resources. Literally, the cost a utility avoids by purchasing a conservation or renewable resource versus acquiring energy elsewhere.
Source: nwppa.org


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