For other uses, see Electric transmission (disambiguation).
"Power lines" redirects here. For power lines in general, see Overhead power line.
This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages)
The examples and perspective in this article may not represent a worldwide view of the subject. You may improve this article, discuss the issue on the talk page, or create a new article, as appropriate.(August 2022) (Learn how and when to remove this message)
This article needs to be updated. Please help update this article to reflect recent events or newly available information.(August 2022)
This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations.(August 2022) (Learn how and when to remove this message)
(Learn how and when to remove this message)
Five-hundred kilovolt (500 kV) Three-phase electric power Transmission Lines at Grand Coulee Dam. Four circuits are shown. Two additional circuits are obscured by trees on the far right. The entire 6809 MW[1] nameplate generation capacity of the dam is accommodated by these six circuits.
Electric power transmission is the bulk movement of electrical energy from a generating site, such as a power plant, to an electrical substation. The interconnected lines that facilitate this movement form a transmission network. This is distinct from the local wiring between high-voltage substations and customers, which is typically referred to as electric power distribution. The combined transmission and distribution network is part of electricity delivery, known as the electrical grid.
Efficient long-distance transmission of electric power requires high voltages. This reduces the losses produced by strong currents. Transmission lines use either alternating current (AC) or direct current (DC). The voltage level is changed with transformers. The voltage is stepped up for transmission, then reduced for local distribution.
A wide area synchronous grid, known as an interconnection in North America, directly connects generators delivering AC power with the same relative frequency to many consumers. North America has four major interconnections: Western, Eastern, Quebec and Texas. One grid connects most of continental Europe.
Historically, transmission and distribution lines were often owned by the same company, but starting in the 1990s, many countries liberalized the regulation of the electricity market in ways that led to separate companies handling transmission and distribution.[2]
^"Grand Coulee Powerplant". U.S. Bureau of Reclamation. Archived from the original on April 29, 2014. Retrieved March 11, 2015.
^"A Primer on Electric Utilities, Deregulation, and Restructuring of U.S. Electricity Markets" (PDF). United States Department of Energy Federal Energy Management Program (FEMP). May 2002. Archived (PDF) from the original on October 9, 2022. Retrieved October 30, 2018.
and 22 Related for: Electric power transmission information
Electricpowertransmission, the tools and means of moving electricity far from where it is generated, date back to the late 19th century. They include...
Wireless power transfer (WPT), wireless powertransmission, wireless energy transmission (WET), or electromagnetic power transfer is the transmission of electrical...
American ElectricPower Company, Inc. (AEP), (railcar reporting mark: AEPX) is an America] domestic electric utility company in the United States. It...
The electricpower industry covers the generation, transmission, distribution and sale of electricpower to the general public and industry. The commercial...
June 1, 1968, by the electric utility industry to promote the reliability and adequacy of bulk powertransmission in the electric utility systems of North...
Power engineering, also called power systems engineering, is a subfield of electrical engineering that deals with the generation, transmission, distribution...
establishment of electrical grids, powertransmission is usually associated most with electricpowertransmission. Alternating current is normally preferred...
an overhead power line. In electrical grids, transmission towers carry high-voltage transmission lines that transport bulk electricpower from generating...
An overhead power line is a structure used in electricpowertransmission and distribution to transmit electrical energy along large distances. It consists...
Electrical grids consist of power stations, electrical substations to step voltage up or down, electricpowertransmission to carry power over long distances...
Electrictransmission may refer to: Electricpowertransmission, the bulk movement of electrical energy from a generating site Diesel–electric transmission...
industry comprises electricity generation (AC power), electricpowertransmission and ultimately electricpower distribution to an electricity meter located...
providing fast-acting reactive power on high-voltage electricity transmission networks. SVCs are part of the flexible AC transmission system device family, regulating...
Current Transmission System (FACTS) is a family of Power-Electronic based devices designed for use on an Alternating Current (AC) Transmission System to...
the transmission business. This electricity transmission and distribution entity was corporatised to provide efficient and reliable electricpower supply...
generation, transmission and distribution of electricity and the development of electricpower projects including those in nuclear power, wind power and coal...
A submarine power cable is a transmission cable for carrying electricpower below the surface of the water. These are called "submarine" because they...
electricity) by the electricpower industry through an electrical grid. Electricpower can be delivered over long distances by transmission lines and used...
Offshore Transmission Owners (OFTOs) operate and maintain offshore electricpowertransmission infrastructure in Great Britain, delivering electrical power from...
An electricpower system is a network of electrical components deployed to supply, transfer, and use electricpower. An example of a power system is the...
Global Information
