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Climate Group (nonprofit)
Climate Group is an international nonprofit that works to accelerate climate action by business and government, best known for hosting Climate Week NYC and campaigns like RE100.
Climate Transition Benchmark
A Climate Transition Benchmark is an EU index label under Regulation (EU) 2019/2089, requiring a portfolio to cut emissions at least 7% yearly toward Paris Agreement goals.
Clinch River Breeder Reactor Project
The Clinch River Breeder Reactor Project (CRBR) was a United States program to build a fast breeder reactor near Oak Ridge, Tennessee, canceled by Congress in 1983.
Clinton nuclear power plant
The Clinton nuclear power plant, now marketed as the Clinton Clean Energy Center, is a single-unit boiling-water reactor in DeWitt County, Illinois, producing about 1,092 megawatts and operated by Constellation Energy.
Clive Oil and Gas Field
Clive is an oil and gas field in central Alberta, Canada, discovered in 1952 in the Leduc Formation and now used for carbon capture and storage.
Close-spaced sublimation
Close-spaced sublimation is a physical vapor deposition technique in which a solid source and substrate sit close together in rough vacuum, best known for thin-film solar cells.
Closed fuel cycle
A closed fuel cycle is a nuclear fuel strategy that reprocesses spent reactor fuel to recover uranium and plutonium for reuse, contrasting with the open once-through cycle.
Closed-loop geothermal systems
Closed-loop geothermal systems (CLGS) harvest heat from hot rock through sealed tubing, requiring no aquifer or fracking; the first commercial plant, Eavor-Loop at Geretsried, Germany, began delivering power in December 2025.
Clostridium ljungdahlii
Clostridium ljungdahlii is an anaerobic, rod-shaped acetogenic bacterium, first described in 1993, that converts synthesis gas mainly into acetate and ethanol. It was the first bacterium discovered to metabolize syngas components and produce ethanol.
CLP Group
CLP Group, founded in Hong Kong in 1901 as China Light & Power, is one of Asia-Pacific's largest investor-owned power businesses, operating across Hong Kong, Mainland China, Australia, and India.
Cluster 2 Oil and Gas Field
Cluster 2 is a group of oil and gas fields in the Krishna-Godavari basin off India's east coast, developed by ONGC, which started production in January 2024.
CMBlu Energy AG
CMBlu Energy AG is a German energy storage company in Alzenau, founded in 2014, whose lithium-free Organic SolidFlow battery provides 10 or more hours of storage.
CNEL EP
CNEL EP (Corporación Nacional de Electricidad) is Ecuador's state-owned strategic public electricity company, created in 2013, whose distribution concession covers 44 percent of the national territory and supplies about half the population.
CNGR
CNGR, fully CNGR Advanced Material Co., Ltd., is a Chinese company founded in 2014 that supplies cathode precursors and other battery materials, ranked world's largest ternary precursor supplier from 2020 to 2024.
CNGR Advanced Material
CNGR Advanced Material is a Chinese company founded in 2014 and headquartered in Tongren, Guizhou, that produces cathode precursors and nickel, cobalt, phosphorus, and sodium battery materials.
CNOOC Zhongshan Jiaming Gas power station
The CNOOC Zhongshan Jiaming Gas power station (中海油中山嘉明电厂), also known as Zhongshan Hengmen Power Station, is a gas-fired cogeneration plant in Zhongshan, Guangdong, with about 2,410 MW capacity.
CNP-1000
The CNP-1000 is a Generation II three-loop pressurized water reactor developed by China National Nuclear Corporation and rated at about 1,000 MWe, with six units operating at Fuqing and Tianwan.
CNP-300
The CNP-300 is China's first indigenous commercial pressurized water reactor, a roughly 300 MWe two-loop design by CNNC, with five units operating in China and Pakistan.
CNP-600
The CNP-600 is a Chinese Generation II pressurized water reactor design developed by CNNC, rated at 650 MWe, with four units at Qinshan and two at Changjiang.
Co-intercalation in graphite
Co-intercalation in graphite is a battery electrode process in which metal ions enter graphite together with their solvent molecules, enabling graphite anodes for sodium-ion batteries.
Co-processed jet fuel
Co-processed jet fuel is jet fuel made by feeding renewable feedstocks like used cooking oil into existing petroleum refinery units, a recognized route to sustainable aviation fuel.
Co-processing in FCC units
Co-processing in FCC units is feeding renewable feeds like vegetable oils and bio-oils into existing refinery FCC units with petroleum, adding renewable carbon to fuels.
Co–N–C single-atom ORR catalysts
Co–N–C single-atom ORR catalysts are platinum-free electrocatalysts with isolated cobalt atoms in nitrogen-doped carbon that catalyze the oxygen reduction reaction in fuel cells and zinc–air batteries.
CO2 heat pump
A CO2 heat pump uses carbon dioxide (R744) as its refrigerant, running transcritical with heat rejected in a gas cooler rather than by condensation, and is best known through Japan's Eco Cute water heaters.
CO2 hydrogenation to ethanol
CO2 hydrogenation to ethanol is a catalytic reaction converting carbon dioxide and hydrogen directly into ethanol, either thermocatalytically or electrocatalytically, as a carbon-recycling fuel route.
CO2 hydrogenation to formic acid
CO2 hydrogenation to formic acid is the catalytic reaction combining carbon dioxide and hydrogen to make formic acid, studied as a liquid, carbon-neutral hydrogen storage method.
CO2 hydrogenation to jet fuel
CO2 hydrogenation to jet fuel is a set of catalytic processes converting carbon dioxide and renewable hydrogen into C8–C16 hydrocarbons for sustainable aviation fuel, demonstrated at kiloton scale in China.
CO2 hydrogenation to light olefins
CO2 hydrogenation to light olefins is a catalytic process that converts carbon dioxide and hydrogen into ethylene, propylene, and butene, using CO2 as a renewable carbon feedstock.
CO2 injection
CO2 injection places carbon dioxide into subsurface reservoirs, used for enhanced oil recovery and for geologic carbon storage; the first commercial flood began at SACROC, Texas, in 1972.
Coal & Allied
Coal & Allied was an Australian coal mining company in the Hunter Valley of New South Wales, controlled by Rio Tinto and sold to Yancoal in 2017.