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Biofuels

Using the energy left over from one primary energy conversion to fuel another. The most prominent example are natural gas co-generation plants which first feed fuel into a gas turbine. The residual heat from that reaction heats water to spin a steam turbine. In this case the residual heat created by a hydrogen fuel cell can be used to spin a steam [..]

Decentralizated electricity generation is a concept used to describe a large number of dispersed energy generators, often closely integrated with the people that use the electricity. Wind turbines and solar panels are good examples: they can be put within communities, be owned by members of the community and generate electricity for it. Alternative [..]

Usually a solution of acids, bases, or salts, electrolytes are substances with free ions which make them effective electrical conductors.

A simple technique for splitting water atoms to obtain hydrogen, driven by an electrical current.

Transforming one form of energy into another. Most energy conversions that run our economy are conversions from a primary source to electricity (wind or nuclear) or movement (oil).

Energy that is usable for practical purposes. These include electricity and petroleum to power appliances and vehicles.

A measurement of the amount of energy stored in a given volume.