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92nd Plenary Session - Rapporteur's Report

October 4-5, 2018, Washington, DC

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Access Charge

A fee paid by an independent power producer or its customer to use a transmission company's system

Adequacy

An electric system's ability (maintenance, load following, planning for future needs, etc.) to supply the aggregate electrical demand and energy requirements of its customers at all times

Aggregator

An entity (for profit or non-profit) that assembles generators or customer loads to achieve economies of scale and diversity among the generators or loads being combined

Alternating Current

A flow of electricity that is uncontrollable as to direction and amount

Ancillary Services/Interconnected Operations Services (IOS)

The services necessary to effect a transfer of electricity between purchasing and selling entities that transmission providers must include in their open access transmission tariffs; IOSs are the voluntary services that transmission providers may offer to their customers (FERC Order 888, April 24, 1996). Ancillary services include regulation and frequency response; reactive supply and voltage control from generating sources, economic dispatch, and the like

Availability

The measure of time that a generating unit, transmission line or other facility is capable of providing service, whether the unit, line or facility is in service (expressed as a percent available for the time under consideration)

Available Transfer Capability (ATC)

The measure of the transfer capability remaining in the physical transmission network for commercial activity beyond already committed uses

Avoided Costs

Costs of new transmission or generation (sometimes both) that electric utilities can "avoid" by purchasing from other sources, managing demand, conservation

Backup Power

Power provided by contract to a customer when its normal sources are unavailable

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