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Delivery Systems

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Transmission management system (TMS)

A transmission management system, commonly called a TMS, is a suite of software tools used by system operators to monitor and manage the...

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Transmission outage

A key consideration in operating transmission is to avoid outages. Transmission outages can be caused by a variety of reasons including...

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Transmission owner (TO)

In markets where the system operations function has been moved to an Independent System Operator (ISO), the term transmission owner, or...

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Transmission pipe

Gas transmission line pipe is typically 12 to 48 inches in diameter and constructed of 1/4- to 3/4-inch thick steel. Laterals off the...

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Transmission rights

Transmission rights are used by generators and/or marketers to ensure delivery of power to a point of sale. Given the current state of...

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Transmission substation

Transmission substations connect two or more transmission lines. In the case where the lines have the same voltage, the substation may...

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Turbine

A turbine is a machine in which the kinetic energy of a moving fluid causes a series of blades to spin, thus converting kinetic energy to...

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U.S. energy flow

An energy flow diagram shows the movement of energy used by a specific consumer or set of consumers from source to usage. In the example...

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Upstream

The natural gas delivery chain comprises three sectors: upstream (generally associated with the production aspect of the industry),...

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Valves

Valves are required along the gas delivery system so that sections of the system can be isolated and shut down in the event of a leak or...

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Volt-ampere reactive (VAR)

A VAR is a unit of measurement of reactive power. VARs occur when AC electric currents and voltage are not in phase. Current and voltage...

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Voltage collapse

Bulk electric systems are operated to maintain voltage within specific predefined ranges. But with the occurrence of certain system...

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Voltage regulator

Voltage regulators are adjustable step-up or step-down transformers that help maintain adequate voltage on long distribution lines. For...

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Water turbine

Water turbines are used in hydroelectric power plants to convert the kinetic energy in flowing water to the mechanical energy of a...

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Wind farm

A wind farm is a group of wind turbines that generate electricity in a common location. A wind farm may also be called a wind power...

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Wye distribution line

A wye distribution line describes a specific configuration of a three-phase line. If a system designer has specified a three-phase line,...

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Zero-emissions credit (ZEC)

There are generation technologies other than renewable generation that can provide energy without emissions. To recognize these, some...

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