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Cryo-compressed hydrogen storage
Cryo-compressed hydrogen storage (CcH₂) is a hydrogen storage method keeping hydrogen at cryogenic temperatures in a pressure vessel rated up to 350 bar, combining liquid hydrogen's density with compressed gas pressure tolerance.
Cryogenic biogas upgrading
Cryogenic biogas upgrading is a separation process that cleans raw biogas by cooling and compressing it, so carbon dioxide, water, and hydrogen sulfide condense while methane stays gaseous, yielding high-purity biomethane.
Cryogenic hydrogen purification
Cryogenic hydrogen purification is an industrial separation process that cools hydrogen-containing gas mixtures until impurities condense or freeze, leaving gaseous hydrogen as the purified product.
Crystal River Energy Complex
Crystal River Energy Complex is a Duke Energy power site in Citrus County, Florida, combining coal, nuclear, and natural gas generation about 85 miles north of Tampa.
Crystal River nuclear power plant
Crystal River Unit 3 was a pressurized water reactor in Citrus County, Florida, operating from 1977 to 2013 after containment damage during a steam generator replacement.
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.
CSI Compressco LP
CSI Compressco LP was a natural gas compression and treating services partnership formed in 2014 and traded on NASDAQ as CCLP until Kodiak Gas Services acquired it in 2024.
CSIA (Indiana gas regulatory mechanism)
The Compliance and System Improvement Adjustment (CSIA) is an Indiana surcharge mechanism allowing natural gas utilities to recover pipeline safety and infrastructure costs through IURC-approved rate increases.
CSMS (charging station management system)
A CSMS, also called a charge point management system (CPMS), is backend software for the remote, real-time operation of electric vehicle charge points, typically speaking the Open Charge Point Protocol (OCPP).
CsPbI3 all-inorganic perovskite solar cells
CsPbI3 all-inorganic perovskite solar cells are photovoltaic devices whose absorber is cesium lead iodide, more thermally robust than hybrid perovskites but prone to converting to a yellow phase.
CsPbI3 black-phase stabilization at room temperature
CsPbI3 black-phase stabilization at room temperature refers to strategies keeping the photoactive black phase of cesium lead iodide from converting to the useless yellow δ phase.
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.
Cu2ZnSnS4 kesterite solar cells
Cu2ZnSnS4 (CZTS) kesterite solar cells are thin-film photovoltaic devices using earth-abundant kesterite absorbers, with certified efficiencies reaching 16.6% in 2025 and potential as tandem bottom cells.
Cuba Special Period energy shortage
The Cuba Special Period energy shortage was the collapse of Cuba's electricity and fuel supply in the 1990s, when the Soviet Union's dissolution cut off subsidized oil imports.
CubicPV
CubicPV is an American solar technology company based in Bedford, Massachusetts, formed in 2021 by the merger of wafer maker 1366 Technologies and perovskite developer Hunt Perovskite Technologies.
Cuddalore IL&FS power station
The Cuddalore IL&FS power station is a 1,200 MW imported-coal-fired power plant at Parangipettai in Tamil Nadu, India, operated by ITPCL and in service since 2015.
Culebra Oil and Gas Field
Culebra Oil and Gas Field is an onshore oil and gas field in the Ecuadorian Amazon, discovered in 1973 and operated by the state company EP Petroecuador.
Culzean Oil and Gas Field
Culzean is a high-pressure, high-temperature gas and condensate field in the UK Central North Sea, about 235 km east of Aberdeen, discovered in 2008 and the UK continental shelf's largest gas producer.
Cumberland Steam Plant
Cumberland Steam Plant, also known as Cumberland Fossil Plant, is a two-unit coal-fired power station in Cumberland City, Tennessee, operated by the Tennessee Valley Authority since 1973.
Cummins Accelera
Accelera by Cummins is the zero-emissions business segment of Cummins Inc., launched in 2023 as the rebrand of its New Power unit, supplying batteries, fuel cells, and electrolyzers.
Cupen Mahuida Oil and Gas Field
Cupen Mahuida (Cupén Mahuida) is a natural gas field in the Neuquina basin, Neuquén Province, Argentina, discovered by YPF in 2001 and known for its tight gas.
Cupiagua Oil and Gas Field
Cupiagua is a giant oil and gas-condensate field in the Llanos foothills of Casanare, Colombia, discovered in 1993 by a BP-led consortium and operated by Ecopetrol since 2010, supplying a third of the country's natural gas.
Curragh Coal Mine
The Curragh Coal Mine is a large open cut and underground coal mine in the Bowen Basin of Central Queensland, operating since 1983 and owned by Coronado Global Resources.
Current matching
Current matching is the design condition in multi-junction solar cells where stacked sub-cells generate equal photocurrents, so none limits the others; it shapes perovskite/silicon tandem design.
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.
Current-voltage hysteresis
Current-voltage hysteresis is the discrepancy between forward and reverse current-voltage scans of a solar cell, characteristic of metal halide perovskite cells, caused mainly by ion migration and complicating efficiency measurement.
Curtailment (renewable energy)
Curtailment is the deliberate reduction of wind or solar power plant output when the grid cannot absorb the electricity, due to transmission limits, stability needs, or supply-demand imbalances.
Curtailment of wind power
Curtailment of wind power is the deliberate reduction of a wind plant's output below achievable generation, ordered by the grid operator during oversupply or transmission congestion.
Cushing Connect Pipeline & Terminal LLC
Cushing Connect Pipeline & Terminal LLC is a joint venture of HF Sinclair and Plains All American that owns a crude oil pipeline from Cushing to Tulsa, Oklahoma.