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Automatic reclosing
Automatic reclosing (autoreclose) is the process by which a circuit breaker that has tripped on a fault closes again automatically, restoring service after temporary faults.
Automotive battery
An automotive battery, also called an SLI or car battery, is a rechargeable battery that starts a vehicle's engine or, in electric vehicles, drives the motor.
Autoridad de Seguridad Nuclear y Radiológica
The Autoridad de Seguridad Nuclear y Radiológica, the Consejo de Seguridad Nuclear (CSN), is Spain's independent public body regulating nuclear safety and radiological protection, created by law in 1980.
Autorità di Regolazione per Energia, Reti e Ambiente
The Autorità di Regolazione per Energia, Reti e Ambiente (ARERA) is Italy's independent regulatory authority for electricity, natural gas, water services, urban waste, and district heating, established in 1995.
Autorité de sûreté nucléaire
The Autorité de sûreté nucléaire (ASN, Nuclear Safety Authority) was France's independent nuclear safety regulator, created in 2006 and replaced on 1 January 2025 by the ASNR after absorbing the IRSN.
Autoriteit Consument en Markt
The Autoriteit Consument en Markt (ACM, Authority for Consumers and Markets) is the Netherlands' independent regulator for competition, consumers, energy, telecom, transport, and post, created in 2013.
Autothermal reforming
Autothermal reforming (ATR) is a process for converting hydrocarbon fuels, most often natural gas, into synthesis gas by partial oxidation and steam reforming in a single reactor.
Autotransformer
An autotransformer, also called an autoformer, is a transformer with a single winding per phase, part shared by primary and secondary, offering copper savings but no electrical isolation.
Avalanche Energy
Avalanche Energy is a Seattle fusion startup founded in 2018 by former Blue Origin engineers Robin Langtry and Brian Riordan, developing compact Orbitron fusion machines.
Avangrid
Avangrid is an American energy company, wholly owned by Spain's Iberdrola since 2024, running electric and gas utilities in New York and New England plus renewable generation.
Avedøre Power Station
Avedøre Power Station (Danish: Avedøre Kraftvarmeværk) is a combined heat and power plant in Hvidovre near Copenhagen, owned by Ørsted and running on wood pellets and straw.
Avgas
Avgas, or aviation gasoline, is a specialized leaded gasoline used to power piston-engine aircraft, the last US transportation fuel still containing tetraethyl lead, with elimination targeted by 2030.
Aviation fuel
Aviation fuel, also known as aircraft fuel, is the refined petroleum product burned by aircraft engines, split between avgas for piston engines and kerosene-based jet fuel for turbines.
AVR reactor
The AVR reactor was a 15 MWe experimental high-temperature gas-cooled reactor in Jülich, West Germany, the world's first pebble-bed reactor, operating from 1967 to 1988.
Awel y Môr
Awel y Môr is a consented offshore wind farm in the Irish Sea off north Wales, planned as an extension to Gwynt y Môr with up to 50 turbines.
Awirs power station
Awirs power station (Centrale des Awirs) was a thermal power station at Les Awirs, Flémalle, Belgium, opened in 1951; its last unit, converted to burn wood pellets in 2005, closed in 2020.
Az Zour North power plant
Az Zour North (شمال الزور) is a gas-fired combined cycle power and desalination plant on the Gulf coast of Kuwait, about 100 km south of Kuwait City.
Az Zour South power plant
Az Zour South power plant (محطة الزور الجنوبية) is a large steam power and seawater desalination station in Al Ahmadi governorate, Kuwait, with a steam capacity of about 2,240 MW.
Az-Zour North Phase 2 and 3
Az-Zour North Phase 2 and 3 is a power and desalination project in southern Kuwait combining a 2,700 MW gas plant with a large seawater desalination facility.
Azadegan Field
Azadegan Field is a giant onshore oil field in Khuzestan province, southwest Iran, near the Iraqi border, discovered in 1998 and split into North and South Azadegan.
Azerbaijan thermal power plant
The Azerbaijan thermal power plant (Azərbaycan İES) is a gas-fired power station at Mingachevir, Azerbaijan, whose eight 300 MW units, commissioned between 1981 and 1990, generate over 40% of the country's electricity.
AzerEnerji
AzerEnerji, formally Azerenergy OJSC, is Azerbaijan's state-owned electricity company and transmission system operator, producing about 90 percent of the country's power from plants it owns.
Azeri–Chirag–Gunashli
Azeri–Chirag–Gunashli (ACG) is a complex of three offshore oil fields in the Azerbaijani sector of the Caspian Sea, about 100 km east of Baku, operated by BP.
Azule Energy
Azule Energy is a 50/50 joint venture of BP and Eni formed in 2022, combining the companies' Angolan oil and gas businesses with its headquarters in Luanda, Angola.
B.Grimm Power
B.Grimm Power is a Thailand-based energy company founded in 1993, the power generation arm of the B.Grimm group and one of Thailand's largest private power producers.
Bab Oil and Gas Field
The Bab Oil and Gas Field is an onshore field in Abu Dhabi, United Arab Emirates, site of the country's first commercial oil discovery in 1960, operated by ADNOC Onshore.
Bab-Habshan–Fujairah Oil Pipeline
The Bab-Habshan–Fujairah Oil Pipeline, formally the Abu Dhabi Crude Oil Pipeline (ADCOP), is a 48-inch pipeline carrying UAE crude from Habshan to Fujairah, outside the Strait of Hormuz, since 2012.
Babcock & Wilcox Co.
Babcock & Wilcox Co. is an American energy technology company founded in 1867 in Providence, Rhode Island, to manufacture its founders' patented water-tube steam boiler.
Bacalhau Field
Bacalhau is a giant pre-salt oil field in Brazil's Santos Basin, operated by Equinor, discovered by Petrobras in 2012 and producing since 15 October 2025 through the FPSO Bacalhau.
Bạch Hổ Field
The Bạch Hổ Field (mỏ Bạch Hổ, "White Tiger") is Vietnam's largest offshore oil field, discovered in 1984 and operated by the Vietsovpetro joint venture.