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
- Alternative fuel
- Alternative fuel vehicle
- Banki turbine
- Battery (electricity)
- Bioalcohol
- Biodiesel
- Biodiesel production
- Biofuel
- Biogas
- Biomass
- Bio-nano generator
- Bitumen
- Breeder reactor
- Bubble fusion – a nuclear fusion reaction thought 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, and 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 converts thermal 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