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- AC
- AC adapter
- AC electrical generation
- AC generation
- AC to DC adapter
- AC vs DC
- AFV
- AMO
- AQI
- AWG
- Abrupt climate change
- Absolute pressure
- Absolute zero
- Acceleration
- Acceleration due to gravity
- Access to electricity
- Access to non-solid fuel
- Acid
- Acid deposition
- Acid rain
- Acid snow
- Acre
- Actuator
- Ad valorem
- Adiabat
- Adiabatic
- Aerosol
- Afforestation
- Agricultural energy use
- Ah
- Air
- Air conditioner
- Air conditioning
- Air drag
- Air exfiltration
- Air infiltration
- Air infiltration and exfiltration
- Air pollution
- Air pollution control devices
- Air pollution from oil sands
- Air quality
- Air quality index
- Aircraft reactor experiment
- Albedo
- Alcohol
- Alga
- Algae
- Algae biofuel
- Alkaline
- Alkane
- Alkene
- Alkyne
- Alpha decay
- Alternating current
- Alternative fuel vehicle
- Alternative fuel vehicle infrastructure
- Aluminum
- Ambient energy
- Ammeter
- Ammonia
- Amp
- Amp hr
- Ampacity
- Amperage
- Ampere
- Ampere hour
- Amu
- Anemometer
- Anode
- Anoxia
- Antarctic ice
- Antarctic ice sheet
- Anthracite
- Anthropocene
- Anthropogenic
- Anthropogenic carbon emissions
- Anthropogenic emissions
- Anti-trust legislation
- Anticline
- Appliance
- Aquifer
- Archean
- Arctic oscillation
- Arctic sea ice
- Arene
- Aromatic hydrocarbon
- Arsenic
- Ash
- Asset
- Asset class
- Atlantic Multidecadal Oscillation
- Atm
- Atmosphere
- Atmospheric oxygen
- Atmospheric pressure
- Atom
- Atomic mass
- Atomic mass unit
- Atomic number
- Atomic weight
- Average fixed cost
- Average variable cost
- Avogadro's number
- Avoidance cost
- Axial tilt
- BHP
- BOE
- BRIC
- BTU
- BTU/hour
- BTU/hr
- BWR
- Band gap
- Banki-Mitchell turbine
- Bar
- Barrel
- Barrels of oil equivalent
- Base
- Base (chemistry)
- Baseload power
- Battery
- Bbl
- Bcm
- Becquerel
- Bedded sediment
- Bell-mouth spillway
- Benzene
- Bernoulli's equation
- Bernoulli effect
- Beryllium
- Beta decay
- Betz limit
- Beyond design basis accident
- Big Bang
- Bioaccumulation
- Biodiesel
- Biodiversity
- Bioethanol
- Biofuel
- Biomagnification
- Biomass
- Biome
- Biosphere
- Bitumen
- Bitumen upgrading
- Bituminous
- Bituminous coal
- Black carbon
- Black hydrogen
- Black swan theory
- Blackbody radiation
- Blue hydrogen
- Boiler
- Boiler slag
- Boiling point
- Boiling water reactor
- Boltzmann's constant
- Boron
- Bottom ash
- Brake
- Braking
- Bramble Cay melomys
- Brayton cycle
- Breastshot wheel
- Breeder reactor
- British thermal unit
- Brittle
- Brown coal
- Brown hydrogen
- Building envelope
- Butane
- CAES
- CANDU
- CANDU reactor
- CCS
- CCUS
- CFL light bulb
- CHP
- CO2 equivalent
- CO2 footprint
- COP
- C vs CO2
- Cadmium
- Calcium
- Calorie
- Calutron
- Cam
- Cambrian
- Camshaft
- Canada residential energy use
- Canadian Energy Security
- Candela
- Cap and trade
- Cap rock
- Capacitance
- Capacitor
- Capital
- Capital stock
- Caprock
- Carbohydrate
- Carbon
- Carbon cap and trade
- Carbon capture and storage
- Carbon cycle
- Carbon dioxide
- Carbon farming
- Carbon flux
- Carbon intensity
- Carbon monoxide
- Carbon pool
- Carbon sequestration
- Carbon sink
- Carbon tax
- Carbon tax vs emissions trading
- Carboniferous
- Carnot efficiency
- Cartel
- Cascade process
- Catchment
- Cathode
- Ceiling fan
- Cellulose insulation
- Celsius
- Centigrade
- Centimeter
- Centrally planned economy
- Centrifuge
- Century
- Cesium
- Cetane number
- Charcoal
- Charge
- Charge carrier
- Chemical
- Chemical bond
- Chemical chain reaction
- Chemical energy
- Chemical isomer
- Chemical reaction
- Chernobyl
- Chernobyl nuclear accident
- Chimney
- Chlorine
- Chute spillway
- Circuit
- Circuit breaker
- Climate
- Climate change
- Climate change consequences on rainforests
- Climate feedback
- Climate forcing
- Climate impacts of oil sands
- Climate projection
- Climate scenario
- Climate simulation ensemble
- Climate system
- Climate threshold
- Climate vs weather
- Closed system
- Cloud
- Club good
- Cm
- Co2
- Coal
- Coal-fired power plant
- Coal ash
- Coal bed methane
- Coal combustion residuals
- Coal fired power plant
- Coal fired power station
- Coal formation
- Coal gas
- Coal liquefaction
- Coal reserve
- Coal seam
- Coal types
- Coase theorem
- Cobalt
- Coefficient of performance
- Cogeneration
- Cogwheel
- Collateral
- Collusion
- Combined cycle gas plant
- Combined heat and power
- Combustion
- Command economy
- Commercial energy use
- Commodity
- Common resource
- Comparing gasoline, diesel, natural gas, and electricity prices
- Competition law
- Compressed air energy storage
- Compressed natural gas
- Compression ignition
- Concentration in parts per
- Conduction
- Conduction band
- Conductor
- Conductor resistance
- Connecting homes to the electrical grid
- Consensus about global warming
- Conservation of energy
- Conservative force
- Consumer price index
- Control (building envelope)
- Control function
- Control rod
- Convection
- Conventional current
- Conventional vs unconventional resource
- Convertible bond
- Convertible loan
- Copper
- Core electron
- Cost
- Cost-benefit analysis
- Cost-effectiveness analysis
- Cost benefit analysis
- Costs for a firm
- Coulomb
- Coulomb's law
- Coulomb force
- Crankshaft
- Crest
- Critical point of water
- Cross-sectional area
- Cross section of the Earth
- Crossflow turbine
- Crude oil
- Cryosphere
- Cubic feet
- Cubic meter
- Curie
- Currency
- Current
- Current transformer
- Curtain
- Curtain wall
- Cyclone separator
- DC
- DC electrical generation
- DC generation
- Dam
- Dam failures