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Disturbance

Any unplanned event or outage that produces an abnormal system condition

Dynamic Scheduling Service

The electronic services (metering, telemetering, computer software, hardware, communications, engineering and administration) that move a transmission customer's generation or demand out of the control area to which it is physically connected and into another area

Economic Dispatch

Operating a generating system by running the generation units that have the lowest operating costs

Electrical Energy

The generation or use of electric power measured in kilowatt-hours, megawatt-hours or gigawatt-hours

Electric System Losses

Transmission, transformation and distribution losses of electric energy between sources of supply and points of delivery (generally, losses are due to heating of transmission and distribution elements)

Electric Utility

A person, corporation, agency, authority or other legal entity or instrumentality that owns or operates facilities for the generation, transmission, distribution or sale of electric energy to the public and that is defined as a utility under the statutes and rules by which it is regulated

Embedded Cost

A cost that cannot be avoided by reducing output because the cost was incurred previously, such as the original cost of an asset (less depreciation, but including the operating and maintenance expenses and all taxes)

Emergency

An abnormal system condition that requires automatic or immediate manual action to limit or prevent loss of transmission facilities or generation supply that might adversely affect the system's reliability

End User

Any commercial, industrial or retail consumer of electricity

Energy Imbalance Service

An ancillary service that corrects any hourly mismatch between a transmission customer's energy supply and the demand ("load") it serves

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