901 articles
Algonquin Power & Utilities
Algonquin Power & Utilities Corp. is a Canadian utility holding company, headquartered in Oakville, Ontario, that owns rate-regulated electric, gas, and water utilities serving about 1.3 million customers.
Alliant Energy
Alliant Energy Corporation is a publicly traded utility holding company, listed on the Nasdaq as LNT, serving about 1 million electric and 435,000 gas customers in Iowa and Wisconsin.
Aluminium conductor composite core
Aluminium conductor composite core (ACCC) is a high-temperature, low-sag overhead power conductor with a carbon and glass fiber composite core, first commercialized in 2005 by CTC Global.
Aluminium conductor steel-reinforced cable
Aluminium conductor steel-reinforced cable (ACSR) is a bare overhead conductor with aluminum wires stranded around a coated steel core, the standard for overhead transmission lines since the early 1900s.
Ameren Illinois
Ameren Illinois is a regulated electric and natural gas utility headquartered in Collinsville, serving about 1.2 million electric and 800,000 gas customers in central and southern Illinois.
Ameren Transmission Company of Illinois
Ameren Transmission Company of Illinois, a St. Louis subsidiary of Ameren Corporation formed in 2010, builds and owns high-voltage transmission projects in Illinois and neighboring states.
American Electric Power
American Electric Power (AEP) is an investor-owned electric utility holding company headquartered in Columbus, Ohio, serving about 5.6 million customers in 11 eastern, central, and southern states.
American Superconductor
American Superconductor is an American power technology company, founded in 1987, that builds grid control systems, superconductor cables, and electronics for wind turbines and the U.S. Navy.
American Transmission Company
American Transmission Company (ATC) is a Wisconsin-based, transmission-only electric utility that began operations in 2001 as the first multi-state utility of its kind in the United States.
American Transmission Systems
American Transmission Systems, also known as ATSI, is a transmission-only utility subsidiary of FirstEnergy that owns about 7,965 circuit miles of lines in Ohio and western Pennsylvania within PJM.
Amprion
Amprion GmbH is a German transmission system operator headquartered in Dortmund that operates an 11,000-kilometer high-voltage grid from the North Sea to the Alps, serving about 29 million people.
Andhra Pradesh Power Generation Corporation
Andhra Pradesh Power Generation Corporation, known as APGENCO, is the Government of Andhra Pradesh's power generation company, operating thermal, hydroelectric, and solar stations across the state since 1999.
Anhui Wenergy
Anhui Wenergy, formally An Hui Wenergy Co., Ltd. (安徽省皖能股份有限公司), is a Chinese power generation company in Hefei, Anhui, listed on the Shenzhen Stock Exchange since 1993 under code 000543.
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.
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-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.
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.
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.
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.
Ashuganj Power Station
Ashuganj Power Station (আশুগঞ্জ পাওয়ার স্টেশন) is a gas-fired power complex at Ashuganj, Bangladesh, on the Meghna River about 90 km northeast of Dhaka, with about 1,588 MW capacity.
Assam Power Generation Corporation
Assam Power Generation Corporation Limited (অসম শক্তি উৎপাদন নিগম লিমিটেড), or APGCL, is Assam's state-owned electricity generation company, created in 2004 when the Assam State Electricity Board was unbundled.
Atlantic City Electric
Atlantic City Electric is a wires-only electric utility serving about 571,000 customers across southern New Jersey. It owns no generation and has been a subsidiary of Exelon since 2016.
Audible noise (transmission lines)
Audible noise from transmission lines is sound from corona discharge on energized conductors, worst in wet weather, with a broadband crackle and a low 120 Hz hum.
Ausgrid
Ausgrid is an Australian electricity distribution network service provider supplying about 1.8 million customers across Sydney, the Central Coast, and the Hunter Valley in New South Wales since 2011.
Austin Energy
Austin Energy is the municipally owned electric utility of the City of Austin, Texas, established in 1895 and known for renewables, which make up about half its generation mix.
Australian Energy Market Operator
The Australian Energy Market Operator (AEMO) is Australia's independent operator of the National Electricity Market and gas markets, established in 2009 and operating Western Australia's system since 2015.
Automatic generation control
Automatic generation control (AGC), also called load frequency control, is the secondary control layer of a power grid that adjusts generator setpoints to restore frequency and hold tie-line schedules.
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.