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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.
Complexul Energetic Oltenia
Complexul Energetic Oltenia (CE Oltenia) is a Romanian state-owned company founded in 2012 that mines lignite in the Oltenia basin and generates electricity, Romania's main lignite producer, now restructuring away from coal toward gas and renewables.
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.
Composite overwrapped pressure vessel
A composite overwrapped pressure vessel (COPV) is a lightweight pressure vessel with a carbon fiber overwrap around an inner liner, used for high-pressure gas storage.
Composite phase-change materials
Composite phase-change materials (CPCMs) are thermal storage materials combining a phase-change material, such as paraffin wax, with conductive supports to overcome low conductivity, leakage, and poor stability.
Composition engineering of perovskite solar cells
Composition engineering is the deliberate tuning of the A, B, and X sites of a perovskite absorber's ABX3 lattice to control a solar cell's bandgap, efficiency, and stability.
Compositional engineering of perovskite materials
Compositional engineering of perovskite materials is the deliberate adjustment of the composition of metal halide perovskites, ABX3 semiconductors used mainly in solar cells, to tune the bandgap and stability.
Comprehensive Research Facility for Fusion Technology
The Comprehensive Research Facility for Fusion Technology (CRAFT) is a Chinese national facility in Hefei testing superconducting magnets, divertor components, and other fusion reactor technologies.
Compressed biogas
Compressed biogas (CBG), also called compressed biomethane or bio-CNG, is purified biogas with most carbon dioxide removed, compressed for use as a vehicle fuel or grid gas.
Compressed hydrogen tube trailer
A compressed hydrogen tube trailer is a semi-trailer fitted with high-pressure cylinders, typically filled to about 200 bar, that delivers gaseous hydrogen to refueling stations by road.
Compressed natural gas
Compressed natural gas (CNG) is natural gas, mostly methane, pressurized to less than 1% of its volume so it can be stored onboard vehicles and burned in engines.
Compressed-air energy storage
Compressed-air energy storage (CAES) is a grid-scale technology that stores surplus electricity as compressed air, usually in underground caverns, and expands it through a turboexpander to regenerate electricity.
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.
Compressor station
A compressor station is a facility along a natural gas pipeline that houses compressors boosting pressure lost to friction, placed every 40 to 100 miles to keep gas flowing.
Concentrated electrolyte
A concentrated electrolyte is a battery electrolyte with salt so concentrated that anions join the solvation shell, changing interfacial chemistry and enabling higher-voltage lithium and sodium batteries.
Concentrated solar power
Concentrated solar power, also called concentrating solar-thermal power, uses mirrors to focus sunlight onto a receiver, heating a fluid that drives a turbine; molten salt storage lets plants generate after sunset.
Concentrator photovoltaics
Concentrator photovoltaics (CPV) is a solar technology that uses lenses or mirrors to concentrate sunlight 200 to 1000 times onto small, high-efficiency multijunction cells, cutting semiconductor costs.
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.
Concrete thermal energy storage
Concrete thermal energy storage (CTES) is a sensible heat storage technology in which concrete blocks cast around steel pipes store heat at up to 400 °C.
Condabri Gas Field
The Condabri Gas Field is a coal seam gas field in the Surat Basin of southeast Queensland, Australia, and a principal producing field of the Australia Pacific LNG project.
Condensing water heater
A condensing water heater is a gas- or oil-fired water heater that recovers heat from its own exhaust by condensing water vapor, making it the most efficient combustion type.
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.
Conemaugh Generating Station
The Conemaugh Generating Station is a 1,872 MW coal-fired power plant on the Conemaugh River near New Florence in Indiana County, western Pennsylvania, commissioned in 1970.
Conesville Power Plant
The Conesville Power Plant was a coal-fired station in Conesville, Ohio, on the Muskingum River, run by AEP from 1981 until its final unit retired in May 2020.
Congo LNG
Congo LNG is a two-phase floating liquefied natural gas project off the Republic of the Congo, operated by Eni on the Marine XII block and exporting since 2024.
Connected Energy
Connected Energy is a British company headquartered in Newcastle upon Tyne that builds battery energy storage systems from second-life electric vehicle batteries, including its modular E-STOR product.
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.
Connecticut Public Utilities Regulatory Authority
The Connecticut Public Utilities Regulatory Authority, or PURA, is the quasi-judicial state agency regulating Connecticut's investor-owned electric, gas, water, and telecommunications utilities, including Eversource and United Illuminating.
Connecticut Yankee nuclear power plant
Connecticut Yankee was a 619 megawatt pressurized water reactor at Haddam Neck in Haddam, Connecticut, which operated from 1968 until its permanent shutdown in December 1996.