C
- Calcination
- Calcium Sulfate
- Calcium Sulfite (CaSO3)
- California Air Resources Board (CARB)
- Canadian Deuterium Uranium Reactor (CANDU)
- Cannel Coal
- Canola Oil
- Capable of Being Fueled
- Capacity
- Capacity (Purchased)
- Capacity Charge
- Capacity Factor
- Capacity Factor (CF)
- Capacity Transaction
- Capacity Utilization
- Capital Cost
- Capital Stock
- Captive Coal
- Captive Refinery MTBE Plants
- Captive Refinery Oxygenate Plants
- Carbon Black
- Carbon Budget
- Carbon Cycle
- Carbon Dioxide (CO2)
- Carbon Dioxide Equivalent (CO2e)
- Carbon Flux
- Carbon Intensity
- Carbon Monoxide (CO)
- Carbon Output Rate (COR)
- Carbon Sequestration
- Carbon Sink
- Carbon Stocks
- Carburetor
- Cargo, Insurance, and Freight (CIF)
- Carrying Costs
- Cash and Carry
- Casinghead Gas
- Cast Silicon
- Catalyst Coke
- Catalytic Converter
- Catalytic Cracking
- Catalytic Hydrocracking
- Catalytic Hydrotreating
- Catalytic Reforming
- Cells
- Cells to OEM (non-PV)
- Cellulosic Fuel Ethanol
- Census Division
- Census Region
- Census Region/Division
- Central Chiller
- Central Cooling
- Central Physical Plant
- Central Warm Air Furnace
- Centralized Water Heating System
- Certificate
- Certificate Requirement
- Cesspool
- Chained Dollars
- Characterization
- Charge Capacity
- Chemical Hydrogen (CH)
- Chemical Separation
- Chlorofluorocarbon (CFC)
- Christmas Tree
- Circuit
- Circuit-mile
- Citygate
- Class Rate Schedule
- Classes of Service
- Clean Development Mechanism (CDM)
- Climate Change
- Clinker
- Cloud Condensation Nuclei (CCN)
- CO Control Period ('Seasons')
- CO Nonattainment Area
- Coal
- Coal Analysis
- Coal Bed
- Coal Bed Degasification
- Coal Blending
- Coal Briquets
- Coal Carbonized
- Coal Chemicals
- Coal Classification
- Coal Coke
- Coal Consumption
- Coal Delivered
- Coal Exports
- Coal Face
- Coal Financial Reporting Regions
- Coal Fines
- Coal Gas
- Coal Gasification
- Coal Grade
- Coal Imports
- Coal Liquefaction
- Coal Mine
- Coal Mining Productivity
- Coal Preparation
- Coal Producing Districts
- Coal Production
- Coal Rank
- Coal Resources
- Coal Sampling
- Coal Stocks
- Coal Sulfur
- Coal Synfuel
- Coal Type
- Coal Washing
- Coal Zone
- Coal-Producing Regions
- Coal-Producing States
- Coalbed Methane Well Gas (CBM)
- Code of Federal Regulations (CFR)
- Cofiring
- Cogeneration (CHP)
- Cogeneration System
- Cogenerator
- Coincidental Demand
- Coincidental Peak Load
- Coke (Coal)
- Coke (Petroleum)
- Coke Battery
- Coke Breeze
- Coke Button
- Coke Oven
- Coke Oven Gas
- Coke Plants
- Coking
- Coking Coal
- Cold-deck Imputation
- Combined Cycle
- Combined Cycle Unit (CCU)
- Combined Heat and Power (CHP)
- Combined Heat and Power (CHP) Plant
- Combined Household Energy Expenditures
- Combined Hydroelectric Plant
- Combined Pumped-Storage Plant
- Combustion
- Combustion Chamber
- Commercial Building
- Commercial Facility
- Commercial Operation (Nuclear)
- Commercial Sector
- Commercially Important Vessel (CIV)
- Commingling
- Commissioned Agent
- Common Equity (Book Value)
- Compact Fluorescent Bulbs (CFLs)
- Company
- Company Automotive (Retail) Outlet
- Company Outlet
- Company-lessee Automotive Outlet
- Company-Open Automotive Outlet
- Company-Operated Automotive Outlet
- Company-Operated Outlet
- Company-operated Retail Outlet
- Competitive Transition Charge (CTC)
- Completion (Oil/Gas Production)
- Completion Date (Oil/Gas Production)
- Compliance Coal
- Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA)
- Compressed Natural Gas (CNG)
- Compressor Station
- Concentrating Solar Power (CSP) Systems
- Concentrator
- Concession
- Concessionary Purchases
- Condensate (Lease Condensate)
- Condenser Cooling Water
- Conditionally Effective Rates
- Conductor (Drilling)
- Conference of the Parties (COP)
- Configuration Maps
- Congestion (Energy Transmission)
- Connected Load
- Connection
- Conservation
- Conservation Feature
- Conservation Program
- Consolidated Entity
- Consolidated Metropolitan Statistical Area (CMSA)
- Construction
- Construction Costs (of the Electric Power Industry)
- Construction Expenditures (of the Electric Power Industry)
- Construction Pipeline of a Nuclear Reactor
- Construction Work in Progress (CWIP)
- Constructive Surplus or Deficit
- Consumer (Energy)
- Consumer Charge
- Consumer Price Index (CPI)
- Consumption
- Consumption per Square Foot
- Continuous Delivery Energy Sources
- Continuous Mining
- Contract Price
- Contract Receipts
- Contracted Gas
- Contracted Maximum Supply Amount (CMSA)
- Contribution to Net Income
- Control
- Control Total
- Conventional Blendstock for Oxygenate Blending (CBOB)
- Conventional Fuel Ethanol
- Conventional Gasoline
- Conventional Hydroelectric Plant
- Conventional Mill (Uranium)
- Conventional Mining
- Conventional Oil and Natural Gas Production
- Conversion Company
- Conversion Factor
- Converted (Alternative-Fuel) Vehicle
- Cooling
- Cooling Degree Day (CDD)
- Cooling Degree Days (CDD)
- Cooling Pond
- Cooling System
- Cooperative Electric Utility
- Coordination Service
- Coordination Service Pricing
- Cord of Wood
- Corn (Bioenergy Feedstock)
- Corn Oil
- Corporate Average Fuel Economy (CAFE)
- Correlation
- Cost Model for Undiscovered Resources
- Cost of Capital
- Cost of Debt
- Cost of Preferred Stock
- Cost of Retained Earnings
- Cost of Service
- Cost Per Gallon (C/Gal)
- Cost-Based Rates (Electric)
- Cost-of-Service Regulation
- Cost, Insurance, Freight (CIF)
- Costs (Imports of Natural Gas)
- Count (CNT)
- Criteria Pollutant
- Crop Residue
- Crude Oil
- Crude Oil Acquisitions
- Crude Oil F.O.B. Price
- Crude Oil Input
- Crude Oil Landed Cost
- Crude Oil Less Lease Condensate
- Crude Oil Losses
- Crude Oil Production
- Crude Oil Qualities
- Crude Oil Refinery Input
- Crude Oil Stocks
- Crude Oil Stream
- Crude Oil Used Directly
- Crude Oil, Refinery Receipts
- Crystalline Fully Refined Wax (CFRW)
- Crystalline Other Wax
- Cubic Feet per Second (CFS)
- Cubic Foot (cf), Natural Gas
- Cull Wood
- Culm
- Cultivar
- Cumulative Depletion
- Current (Electric)
- Current Assets
- Current Liabilities
- Current Ratio
- Customer Choice
- Customs District (Coal)
- Customs Import Value (C.I.V.)
- Cut-off Grade (Uranium)
- Cycle
- Cycle/Reactor History
- Cycling (Natural Gas)
- Cycling Plant