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API gravity
API gravity, also called Degree API, is a scale in degrees expressing the density of liquid petroleum products relative to water, with fresh water at 10 degrees.
Apolônio Sales hydroelectric plant
The Apolônio Sales hydroelectric plant (Usina Hidrelétrica Apolônio Sales), formerly Moxotó, is a 400 MW hydroelectric plant on the São Francisco River in Alagoas, Brazil, opened in 1977.
Appalachian coal region
The Appalachian coal region is a belt of coalfields in the eastern United States covering nearly 70,000 square miles, from Pennsylvania and Ohio to central Alabama.
Appalachian Hydrogen Hub
The Appalachian Hydrogen Hub, formally ARCH2, is a US Department of Energy-funded regional hydrogen network led by Battelle, selected in October 2023 with up to $925 million in federal funding.
Appalachian Power
Appalachian Power (APCo) is a regulated electric utility headquartered in Charleston, West Virginia, serving about 1.1 million customers in three states as part of American Electric Power.
Apparent power
Apparent power, written S, is the product of rms voltage and rms current in an AC circuit, measured in volt-amperes; transformers and UPS systems are rated in it.
Approved List of Models and Manufacturers
The Approved List of Models and Manufacturers (ALMM) is a list maintained by India's Ministry of New and Renewable Energy specifying which solar modules and cells may be used in government-backed projects.
APR-1400
The APR-1400 (Advanced Power Reactor 1400) is a South Korean Generation III pressurized water reactor of the 1,400 MWe class developed by KEPCO and KHNP.
Aqaba FSRU
The Aqaba FSRU is Jordan's floating storage and regasification unit, moored at the port of Aqaba on the Red Sea and the country's sole LNG import facility since 2015.
Aquarion
Aquarion Water Company is a water utility headquartered in Bridgeport, Connecticut. Founded in 1857 as the Bridgeport Hydraulic Company, it was sold to the Aquarion Water Authority in 2026 for $2.4 billion.
Aqueous lithium-ion battery
An aqueous lithium-ion battery (ALIB) is a rechargeable lithium-ion battery using water with dissolved lithium salts instead of flammable organic solvents, proposed in 1994 and aimed at grid-scale storage.
Aqueous zinc-iodine battery
An aqueous zinc-iodine battery is a rechargeable, water-based battery using zinc and iodine electrodes, valued for low cost and safety but limited by the polyiodide shuttle effect.
Aqueous zinc–manganese dioxide batteries
Aqueous zinc–manganese dioxide batteries are rechargeable batteries pairing a zinc metal anode with a manganese dioxide cathode in a water-based electrolyte such as zinc sulfate.
Aquifer thermal energy storage
Aquifer thermal energy storage (ATES) is an underground technology that stores heat and cold seasonally in groundwater, using paired wells to heat and cool buildings, mostly in the Netherlands.
Aquion Energy
Aquion Energy was an American battery manufacturer spun out of Carnegie Mellon University in 2009 by Jay Whitacre, producing Aqueous Hybrid Ion sodium batteries for stationary energy storage from Pittsburgh, Pennsylvania.
Aquivion
Aquivion is a short-side-chain perfluorosulfonic acid ionomer produced by Solvay Specialty Polymers and, after 2023, Syensqo, used in fuel cells, water electrolyzers, and flow batteries.
Arab Gas Pipeline
The Arab Gas Pipeline (خط الغاز العربي) is a natural gas pipeline that carries Egyptian gas from El Arish in the Sinai Peninsula through Jordan to Syria.
Arab Heavy (crude oil)
Arab Heavy is a high-sulfur, low-gravity crude oil produced by Saudi Aramco from the Safaniya field, the heaviest and cheapest of the five Arabian grades.
Arab Petroleum Pipelines
The Arab Petroleum Pipelines Company, known as SUMED, is an Egyptian company whose 320-kilometer pipeline carries Gulf crude from Ain Sukhna on the Red Sea to Sidi Kerir near Alexandria.
Arabelle Solutions
Arabelle Solutions is a French company, wholly owned by EDF since 2024, that designs, manufactures, and services the turbines and generators that convert nuclear reactor steam into electricity.
Aradel Holdings
Aradel Holdings is a Nigerian integrated energy company spanning exploration and production, gas processing, and refining, listed on the Nigerian Exchange under the ticker ARADEL.
Arandala gas field
Arandala (Campo Arándala) is a natural gas field in the Lower Magdalena Valley basin of Córdoba, northern Colombia, operated by Canacol Energy and placed in production in October 2020.
Arara Azul gas field
Arara Azul is an onshore oil and gas field in Brazil's Solimões Basin, Amazonas, discovered in 2010 and operated by Petrobras as part of the Urucu province.
Araucária Refinery
The Araucária Refinery, officially the Presidente Getúlio Vargas Refinery (Repar), is a Petrobras oil refinery in Araucária, Paraná, inaugurated in 1977 and producing about 12% of Brazil's petroleum derivatives.
Aravali Power Company Private Ltd
Aravali Power Company Private Limited, a joint venture of NTPC, HPGCL, and IPGCL, owns and operates the 1,500 MW Indira Gandhi Super Thermal Power Project in Jhajjar district, Haryana.
ARC and SPARC
ARC and SPARC are related compact, high-field tokamak fusion devices designed by MIT and Commonwealth Fusion Systems: SPARC a net-energy demonstration, ARC a 400 MW power plant.
Arc chute
An arc chute is a chamber in a circuit breaker that draws out, divides, and extinguishes the electric arc formed when the breaker's contacts separate under load.
ARC reactor
The ARC reactor is an MIT tokamak fusion power plant concept using high-temperature superconducting magnets, carried forward since 2018 by Commonwealth Fusion Systems as the plant to follow SPARC.
Arc-suppression coil
An arc-suppression coil, also called a Petersen coil or ground-fault neutralizer, is an inductive reactor between a power system's neutral and earth that cancels ground-fault current so arcs self-extinguish.
Arcadia gas field
The Arcadia gas field is a coal seam gas field in the Bowen Basin of central Queensland, Australia, near Injune and about 148 km north of Roma.