901 articles
Companhia de Electricidade de Macau
Companhia de Electricidade de Macau (澳电) is the utility holding Macau's exclusive concession to transmit, distribute, and supply electricity since 1985, extended to 2040, with most power imported from Guangdong.
Companhia Paranaense de Energia
Companhia Paranaense de Energia (Copel) is a Brazilian electric utility headquartered in Curitiba, Paraná. Founded as a state-owned company in 1954, it was privatized in 2023 and serves nearly all of Paraná.
Complexul Energetic Hunedoara
Complexul Energetic Hunedoara (CEH) was a Romanian state-owned hard-coal electricity producer formed in 2012 by merging the Mintia and Paroșeni power plants with coal mining operations.
Composite insulator
A composite insulator is an electrical insulator for overhead power lines combining a fiberglass core rod, silicone rubber housing, and metal end fittings, giving high tensile strength at low weight.
Compression splice
A compression splice is a tubular metal fitting crimped onto the two ends of an overhead power conductor, forming a full-tension joint that carries both mechanical load and electrical current.
Concrete pole
A concrete pole is a utility pole made of reinforced or prestressed concrete, supporting power and telecom lines; typically spun, it resists fire, rot, and termites, and lasts roughly 60 years.
Conductor cover-up
Conductor cover-up is temporary insulating equipment, such as rubber line hose, blankets, and hoods, that utility line workers place over energized conductors to prevent accidental contact during live-line maintenance.
Conductor icing
Conductor icing is the buildup of atmospheric ice on overhead power line conductors, a major weather-related threat to power grids that adds load and can cause line failures.
Connecticut Light and Power
Connecticut Light and Power (CL&P) is an investor-owned electric utility serving most of Connecticut, with about 1.28 million customers, operating as a direct subsidiary of Eversource Energy.
Conservation voltage reduction
Conservation voltage reduction (CVR) is a grid technique in which utilities lower feeder voltage a few percent to cut energy use, peak demand, and line losses.
Constant-voltage transformer
A constant-voltage transformer, or ferroresonant transformer, keeps output voltage nearly constant despite wide input swings using magnetic core saturation and a resonant capacitor, with no electronics or moving parts.
Constellation Energy
Constellation Energy is a Baltimore-based American energy company created in 2022 from Exelon's separation; it operates the largest US nuclear fleet and acquired Calpine in 2026.
Consumers Energy
Consumers Energy is an investor-owned utility headquartered in Jackson, Michigan, founded in 1886 and serving 1.9 million electric and 1.8 million gas customers as the principal subsidiary of CMS Energy.
Converter transformer
A converter transformer is a power transformer that connects an AC network to power-electronic converter valves, chiefly in HVDC transmission stations and industrial rectifier plants.
Cooperative Energy
Cooperative Energy, formerly South Mississippi Electric, is a not-for-profit, member-owned generation and transmission cooperative in Hattiesburg, Mississippi, founded in 1941 to supply 11 distribution cooperatives serving about 460,000 members across 55 counties.
CopperString
CopperString is a Queensland transmission project connecting Mount Isa and the North West Minerals Province to the National Electricity Market near Woodstock, acquired by the state government in 2023.
Corona loss
Corona loss is the power dissipated when air around a high-voltage conductor ionizes, an effect of voltage that matters mainly on lines of 345 kV and higher.
Corona ring
A corona ring is a circular conductive fitting, usually a metal toroid, attached to high-voltage equipment terminals to spread the electric field gradient and prevent corona discharge, reducing noise and radio interference.
Corporación Eléctrica Nacional
Corporación Eléctrica Nacional (CORPOELEC, Corpoelec) is Venezuela's state-owned electricity company, created in 2007 to consolidate the country's public and private utilities into a single national operator.
Covanta Holding
Covanta Holding was an American energy company headquartered in Morristown, New Jersey, that converted municipal solid waste into electricity until it was renamed Reworld in April 2024.
Covered conductor
A covered conductor is an overhead power line conductor with an insulating outer layer, used to reduce faults and fire ignition when vegetation or animals contact the wire.
CPS Energy
CPS Energy is the municipally owned electric and gas utility of San Antonio, Texas, serving roughly 950,000 electric customers since its 1942 purchase by the city.
Crest factor
Crest factor is the ratio of a waveform's peak value to its RMS value, a measure of peakiness; a sine wave has a crest factor of 1.414.
Cross-bonding
Cross-bonding is a sheath-bonding method for three-phase systems of single-core power cables in which the metallic sheaths are cross-connected between sections so induced voltages cancel, suppressing circulating currents and limiting sheath voltages.
Crossarm
A crossarm is a structural beam bolted near the top of a utility pole that supports conductors, insulators, and transformers on overhead distribution and transmission lines.
Crossing tower
A crossing tower is a transmission tower built at a wide obstacle such as a river, strait, or valley, where the line must span far farther than normal.
CS Energy
CS Energy is a Queensland Government-owned energy corporation, established in 1997, that generates electricity in Australia's National Electricity Market and retails to large commercial and industrial customers.
CT saturation
CT saturation is the condition where a current transformer's magnetic core saturates, so its secondary current is distorted and no longer proportional to the primary current.
Current transformer
A current transformer (CT) is an instrument transformer that scales high primary currents down to standard values, typically 5 A or 1 A, for meters and protective relays.
Current-source converter
A current-source converter is a power electronic converter that holds a stiff DC current behind an inductor; in HVDC it is known as the line-commutated converter.