These are modes of energy production, energy storage, or energy conservation, listed alphabetically. Note that not all sources are accepted as legitimate or have been proven to be tappable.

• Atomic energy
• Banki turbine
• Battery (electricity)
• Bioalcohol
• Biodiesel
• Biodiesel production
• Biofuel
• Biogas
• Biomass
• Bio-nano generator
• Bitumen
• Breeder reactor
• Bubble fusion – a nuclear fusion reaction hypothesized to occur during sonoluminescence, an extreme form of acoustic cavitation.
• Coal
• Coal mining
• Cold fusion
• Combustion
• Compound turbine – two axle, steam
• Compressed air energy storage
• Concentrated solar power
• Deep lake water cooling
• Diesel
• Dyson sphere
• Electrical grid
• Energy tower
• External combustion engine

• Fischer–Tropsch process
• Flywheel (storage)
• Fossil fuel
• Fossil-fuel power station
• Francis turbine
• Fuel – a substance used as a source of energy, usually by the heat produced in combustion
• Fuel cell
• Fuel efficiency
• Fusion power
• Gas turbine
• Gasohol
• Geothermal exchange heat pump
• Geothermal heating
• Geothermal power
• Grid energy storage
• High-altitude wind power – Energy can be captured from the wind by kites, aerostats, airfoil matrices, balloons, bladed turbines, kytoon, tethered gliders sailplanes
• Hydroelectricity
• Hydrogen economy
• Hydrogen storage, Underground hydrogen storage
• Hydropower-Energy from moving water
• Hygroelectricity
• Implosion
• Kaplan turbine
• Light crude oil
• Liquid fuel
• Liquid nitrogen engine
• Marine current power
• Magnetohydrodynamic, generator, MHD generator or dynamo transforms thermal energy or kinetic energy directly into electricity
• Methane clathrate
• Methanol
• Methanol economy
• Natural gas
• Natural gas field
• Natural gas vehicle
• Nuclear energy – energy in the nucleus or core of atoms^[1]
• Nuclear fusion
• Nuclear reactor
• Nuclear reprocessing
• Oil drilling
• Oil platform
• Oil refinery
• Oil shale
• Oil well
• Osmotic power – or salinity gradient power – is the energy available from the difference in the salt concentration between seawater and river water.
• OTEC – ocean thermal energy conversion
• Oxidation
• Peat
• Penrose Mechanism
• Petroleum
• Photovoltaics
• Piezoelectricity
• Pneumatics – compressed air
• Products based on refined oil
• Propellant
• Pumped-storage hydroelectricity
• Pyrolysis
• Quark matter energy
• Renewable energy
• Savonius wind turbine – wind
• Small hydro
• Solar box cooker
• Solar cell
• Solar chimney
• Solar panel
• Solar energy
• Solar power satellite
• Solar thermal energy
• Solar updraft tower – large version of the solar chimney concept
• Solar water heating
• Solid fuel
• Sonoluminescence – the emission of short bursts of light from imploding bubbles in a liquid when excited by sound.
• SSTAR – small, sealed, transportable, autonomous reactor
• Steam turbine
• Stirling engine
• Straight vegetable oil
• Stranded gas reserve
• Sulfur-iodine cycle
• Sustainable design
• Synfuel
• Syngas
• Tar sands
• Tesla turbine
• Thermal depolymerization
• Thermal power station
• Thermoelectric power
• Thorium
• Tidal power
• Transmutation
• Turgo turbine – impulse water turbine designed for medium head applications
• Tyson turbine – for river flow harnessing

• UASB
• Uranium
• Vacuum energy
• Vibration energy harvesting
• Vortex energy
• Water turbine
• Wave power
• Wind energy
• Wind farm
• Wind turbine
• Wood fuel
• Wood gas
• Zero-point energy