A form of energy that must be manufactured from a primary source before it can be used: electricity and hydrogen are the two great examples. A carrier is only as clean, and only as plentiful, as whatever made it, which is why the same hydrogen molecule can be a climate solution or a detour depending on the electricity or gas behind it.
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Ammonia, Energy Sources IEA's Future of Hydrogen report discusses ammonia at length as an energy carrier for storing and transporting renewably generated electricity across distance.
Source United States Energy Information Administration Official Site
Source United States Energy Information Administration Official Site
Sources
1. United States Energy Information Administration Official Site
US Energy Information AdministrationWhat is energy explained, Sources of energyQuote, What is energy explained, Sources of energy
Both types of energy can be used as primary energy sources (an energy source in its original form) to produce useful energy such as heat, or they can be used to produce secondary energy sources such as electricity and hydrogen.
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