Energy carrier
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An energy carrier is simply any system or substance used to transfer energy from somewhere to somewhere else. For example, If energy from a nuclear power plant is used to produce Hydrogen by electrolyzing water which is then burned in a fuel cell to drive a car, then Hydrogen is the energy carrier moving energy from natural Uranium to the vehicle. This is usually differentiated from "sources" of energy such as coal, oil, natural gas, etc, whose energy was not "put there" by human beings but rather by various natural processes. It is also considered different from energy transmission, i.e. the wires and transformers used to move electricity from power plants to consumers.