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Arcadium Lithium
Arcadium Lithium was a lithium chemicals producer created in January 2024 by the merger of Livent and Allkem, then acquired by Rio Tinto for $6.7 billion in 2025.
ArcelorMittal Temirtau
ArcelorMittal Temirtau was a Kazakh steel and mining company in Temirtau that ran Kazakhstan's largest steel plant and eight coal mines until the state took it over in 2023.
Arch Resources
Arch Resources was an American coal mining company formed in 1997, headquartered in St. Louis; it merged with CONSOL Energy in 2025 to form Core Natural Resources.
Archaea Energy
Archaea Energy is a Houston-based American renewable natural gas producer founded in 2018, which turns landfill biogas into pipeline-quality fuel and was acquired by bp in 2022.
ARCHES (hydrogen hub)
ARCHES, the Alliance for Renewable Clean Hydrogen Energy Systems, is a California public-private partnership that led the California Hydrogen Hub, selected in 2023 and terminated in 2025.
Archimede solar power plant
Archimede is a 5 MW concentrating solar power plant in Sicily, inaugurated by Enel in 2010 as the first to use molten salts as heat transfer fluid.
Archimedes screw turbine
An Archimedes screw turbine is a hydropower machine that runs the ancient Archimedes screw in reverse to generate electricity at low-head sites, with safe passage for fish.
Archimedes Wave Swing
The Archimedes Wave Swing is a fully submerged wave energy converter that generates electricity from wave motion with a linear generator, developed in the Netherlands and tested off Portugal in 2004.
ARCO
ARCO, or Atlantic Richfield, was an American oil and gas company formed in 1966 and known for discovering Alaska's Prudhoe Bay oil field; BP purchased it in 2000.
Arctic LNG 2
Arctic LNG 2 (Арктик СПГ 2) is a Russian LNG project on the Gydan Peninsula, developed by NOVATEK with 19.8 million tons of annual capacity.
Arctic LNG 2 Terminal power station
The Arctic LNG 2 Terminal power station is a 1,500 MW gas-fired power plant in Russia, ordered by Novatek in 2022 to serve the Arctic LNG 2 project.
Ardebil Sabalan power station
The Ardebil Sabalan power station is a combined-cycle gas-fired power plant in Ardabil Province, northwestern Iran, with a nominal capacity of about 1,440 MW, supplying roughly 3 percent of Iran's electricity.
Area control error
Area control error (ACE) is the real-time difference between a balancing authority's actual and scheduled net power interchange, adjusted for frequency bias, that automatic generation control drives toward zero.
Arenal gas field
The Arenal gas field is a natural gas block in northern Tierra del Fuego, Chile, operated by Enap and the region's main source of tight gas.
Areva
Areva was a French state-owned nuclear industry group created in 2001, spanning the whole fuel cycle, then dismantled between 2016 and 2018 into Orano and Framatome.
Arevon
Arevon Energy is an American independent power producer formed in 2021 and headquartered in Scottsdale, Arizona, operating more than 5.3 GW of solar and battery storage across 17 states.
Argonauta Oil and Gas Field
Argonauta is an offshore oil and gas field in the Campos Basin, off Espírito Santo, Brazil, and one of the three main fields of the Parque das Conchas development.
Argyle gas field
The Argyle gas field is a coal seam gas field in the Surat Basin of southeast Queensland, discovered by Queensland Gas Company in 2000 and producing from the Walloon Coal Measures.
Argyrodite sulfide electrolyte
Argyrodite sulfide electrolyte is a crystalline lithium-ion conductor of formula Li₆PS₅X (X = Cl, Br, I), first reported in 2008 and used as the solid electrolyte in all-solid-state batteries.
Aries-Aries Norte gas field
The Aries-Aries Norte gas field is a natural gas and condensate field complex offshore Tierra del Fuego, Argentina, within the Cuenca Marina Austral 1 concession operated by Total Austral.
Arish–Ashkelon Pipeline
The Arish–Ashkelon Pipeline, also called the Eastern Mediterranean Gas (EMG) pipeline, is a subsea natural gas pipeline between El Arish, Egypt, and Ashkelon, Israel, built in 2008.
Arizona Corporation Commission
The Arizona Corporation Commission (ACC) is a five-member, publicly elected commission established by the Arizona Constitution in 1912 that sets rates for investor-owned utilities, regulates securities, and handles corporate filings.
Arizona Public Service
Arizona Public Service, the largest electric utility in Arizona, serves about 1.4 million customers from Phoenix and operates Palo Verde Generating Station, the largest power producer in the United States.
Arkansas Electric Cooperative Corporation
Arkansas Electric Cooperative Corporation is a Little Rock generation and transmission cooperative, incorporated in 1949, that wholesales power to Arkansas' distribution cooperatives, covering about 62% of the state's land area.
Arkansas Nuclear One
Arkansas Nuclear One is a two-unit pressurized water reactor plant on Lake Dardanelle near Russellville, Arkansas, the state's only operational nuclear power plant, owned by Entergy since 1974.
Arkutun-Dagi Oil and Gas Field
Arkutun-Dagi (Аркутун-Даги) is an offshore oil and gas field on the shelf of Sakhalin Island, Russia, the third and last Sakhalin-1 field, producing first oil in 2015.
Arlanskoye oil field
The Arlanskoye oil field (Арланское месторождение) is a giant oil field in northwest Bashkortostan, Russia, discovered in 1955 and the largest in the republic by reserves.
Arlit uranium mines
The Arlit uranium mines are uranium mining operations at Arlit in northern Niger, worked since 1971 by SOMAÏR and COMINAK and making Niger a leading uranium producer.
Armenian nuclear power plant
The Armenian Nuclear Power Plant (ANPP, also called the Metsamor plant) is Armenia's only nuclear power station, in the Ararat valley near Metsamor, west of Yerevan.
Armored face conveyor
An armored face conveyor is a heavy chain scraper conveyor along a longwall coal face that carries coal to the headgate and serves as the shearer's track.