Glossary

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)

Paying multiple charges to more than one utility to move (wheel) electric power across bulk-power systems (also called pancaked rates)

An uncontrolled successive loss of system elements triggered by an incident at any locale which typically results in widespread service interruptions and cannot be restrained from spreading ("cascading") beyond an area predetermined by appropriate studies

A facility that connects two transmission systems or control areas, or that connects a non-utility generator to a system or control area; (when capitalized, it refers to the North American Eastern, Western, ERCOT or Alaska electric systems)

Provides protection against under voltage and/or voltage collapse by injecting positive or negative VARs as necessary to support a transmission system

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...

The difference between scheduled and real power flows on a transmission path, assuming zero inadvertent interchange (also called loop flow, unscheduled power flow, or circulating power flow)

Capacity deficient revenues

The specific set of transmission elements between two areas that comprise one or more electrical systems

Wholesale electricity pricing that is determined separately by zone, based on the supply and demand in a region, and uses locational marginal pricing (LMP)