Delivery Systems

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Circuit

A circuit is an intentional close-looped path through which electrons move to provide energy.

Circuit breaker

A circuit breaker, sometimes simply called a breaker, is an electrical switch that can be automatically or manually operated and reset. Circuit …

Circuit protection

The electric transmission and distribution systems require equipment to protect against a wide variety of electrical conditions that can damage …

Citygate

The citygate is the intersection between the mainline transmission system owned by a natural gas transmission or pipeline company and the local …

Closure

A closure is a cap that threads or clamps at the open end of pipe.

Coal electric generation

The ready availability of low-cost coal historically made coal-fired generation a favorite of many utilities around the world. Most coal-fired g …

Coal steam turbine

A coal steam turbine burns coal to create steam which is then used to generate electricity.

Cogeneration

Using combined heat and power technology, electricity is generated first in the process, with the waste heat captured to create useful thermal e …

Coincident peak demand

Coincident peak demand is the demand of a customer or group of customers at the time of the electric or gas system’s peak demand.

Combined heat and power

Combined heat and power, or CHP, is the concurrent production of useful thermal energy (heating and/or cooling) and electricity or mechanical po …

Combined-cycle gas turbine

A highly efficient way to use gas to generate electricity is to combine a gas combustion turbine with a steam turbine in a power plant called a …

Compressor station

Compressors and related equipment on a transmission system are contained in compressor stations. Stations consist of one or more compressors, ty …

Concentrated solar power (CSP)

Concentrated solar power or CSP technology concentrates sunlight to create heat, and then it uses the heat to create mechanical power.

Conductor

From a scientific standpoint, a conductor is any material that allows electrons to move easily from one atom to another, thereby facilitating el …

Congestion management

Transmission congestion occurs when there is insufficient transmission capacity to simultaneously accommodate all requests for transmission ser …

Contingency

A contingency is an unexpected failure or outage of a system component such as generator, transmission line, circuit breaker, or other electrica …

Conventional gas supply

Conventional natural gas is produced from a well drilled into a geological formation in which the reservoir and fluid characteristics permit the …

Corrosion

Corrosion is the natural process in which materials made from metal deteriorate through an electrochemical reaction known as oxidation (more com …

Cubic foot

A cubic foot, or cf, is the most common unit of measurement of gas volume.

Current transformer

A current transformer (CT) is used to reduce the current or voltage of an electric circuit so that the electric flow can be cost-effectively mea …