901 articles
Duke Energy Ohio
Duke Energy Ohio is a regulated electric and natural gas utility serving southwestern Ohio, including Cincinnati, formed from Cincinnati Gas & Electric and merged into Duke Energy in 2006.
Duke Energy Progress
Duke Energy Progress is a Duke Energy subsidiary serving about 1.6 million customers in central and eastern North Carolina, Asheville, and parts of South Carolina.
Dumsor
Dumsor, also written Dum-Sor or Dum So, is the Ghanaian term from Akan words for "off" and "on" for the country's persistent, erratic power outages and load shedding.
Dunkelflaute
Dunkelflaute, German for "dark wind lulls", is a period of days with low wind and sun that leaves wind and solar power generating very little electricity.
Dynamic line rating
Dynamic line rating (DLR) is a power-systems technique that sets an overhead transmission line's capacity from real-time weather, typically raising usable capacity 10 to 30% over static ratings.
Dynamic power cable
A dynamic power cable is a submarine power cable connecting a floating offshore structure, usually a floating wind turbine, to the seabed while moving with waves and currents.
Dynamic voltage restorer
A dynamic voltage restorer (DVR) is a series-connected custom power device that injects corrective voltage to protect sensitive loads from sags, swells, and other disturbances, but not outages.
Dynegy
Dynegy Inc. was an American independent power producer and retail electricity supplier headquartered in Houston, Texas. It merged into Vistra Energy in 2018, with the Dynegy name surviving as a retail brand.
e-distribuzione
e-distribuzione, formerly Enel Distribuzione until June 2016, is an Italian electricity distribution system operator and the largest in Italy, serving over 31 million customers through a network of more than 1,150,000 km.
E-REDES
E-REDES, formerly EDP Distribuição until 2021, is the electricity distribution network operator for mainland Portugal, part of the EDP group and serving 6.5 million clients.
E. Linn Draper Jr.
E. Linn Draper Jr. (born 1942) is an American nuclear engineer and utility executive who was chairman, president, and CEO of American Electric Power from 1993 to 2003.
Earth potential rise
Earth potential rise (EPR), also called ground potential rise, is the voltage an earthing system, such as a substation ground grid, attains relative to remote earth during a fault.
Earthing switch
An earthing switch is a mechanical switching device that connects de-energized circuits or high-voltage equipment to earth potential, protecting personnel during maintenance; it is standard in substations and governed by IEC 62271-102.
Earthing system
An earthing system, also known as a grounding system, is the set of conductors and electrodes connecting an electrical installation to earth, ensuring safe fault clearance.
East Kentucky Power Cooperative
East Kentucky Power Cooperative is a not-for-profit electric utility in Winchester, Kentucky, that generates wholesale power for 16 member cooperatives serving over 1.2 million Kentuckians.
East-West Tie Limited Partnership
East-West Tie Limited Partnership is an Ontario limited partnership that owns the East-West Tie Line, a 450-kilometer, 230-kilovolt transmission line between Wawa and Thunder Bay, completed in 2022.
Eastern Interconnection
The Eastern Interconnection is the North American power grid covering everything east of the Rocky Mountains except most of Texas and Quebec, running at a synchronized 60 Hz.
Economic dispatch
Economic dispatch is an optimization method in power systems engineering that allocates scheduled generation among online units to minimize total fuel cost while meeting demand and operating limits.
Edelap
Edelap (Empresa Distribuidora La Plata S.A.) is an Argentine electric power distribution company created in 1992 from SEGBA's La Plata unit, serving six partidos of Buenos Aires Province.
Edeltech
Edeltech (Hebrew: אדלטק) is a private Israeli energy company founded in 1989 by Joseph Edelsburg, whose natural gas power plants supply about 20% of Israel's electricity.
Edison (energy company)
Edison S.p.A. is an Italian energy company headquartered in Milan, founded in 1884 and controlled by the French utility EDF since 2012, with leading positions in Italian electricity and gas.
Edison International
Edison International is a California-based holding company whose principal subsidiary, Southern California Edison, serves about 5.28 million electric customers across central, coastal, and southern California.
Edison screw
The Edison screw, also known as the Edison base, is the threaded lamp cap and socket system, introduced by Thomas Edison in 1880, used to secure light bulbs.
EDP (Portuguese company)
EDP, formally EDP – Energias de Portugal, is a Portuguese electric utility headquartered in Lisbon that generates and supplies electricity, with networks in Portugal, Spain, and Brazil and renewables through EDP Renewables.
Egyptian Electricity Holding Company
The Egyptian Electricity Holding Company (القابضة لكهرباء مصر, EEHC) is Egypt's state-owned holding company for electricity generation, transmission, and distribution, created in 2000 from the Egyptian Electricity Authority.
EirGrid
EirGrid is Ireland's state-owned electricity transmission system operator, running the national grid and interconnectors to Great Britain, and jointly operating the Single Electricity Market with SONI.
EL5-Energo
EL5-Energo, known until 2022 as Enel Russia, is a Russian publicly traded power generator majority-owned by LUKOIL, with 25 plants and 9.5 GW installed capacity after its 2026 merger.
Electric Power Development (J-POWER)
Electric Power Development Co., Ltd. (電源開発株式会社), known commercially as J-POWER, is a Japanese power generation company founded in 1952, headquartered in Tokyo, and fully privatized in 2004.
Electric power distribution
Electric power distribution is the final stage of the electricity supply chain, delivering power from distribution substations to customers at voltages from 4 kV down to 120 V.
Electric power system
An electric power system is the network that generates electricity, transmits it over long distances at high voltage, and distributes it to consumers, joined at substations.