View source for Primary vs end use accounting

 [[Category:Done 2020-02-29]] 
[[category:371 topics]]
[[category: Lecture 2A High energy society]]
[[Category:Translated to French]]
[[fr:Comptabilisation de l'énergie primaire et de l'énergie d'utilisation finale]]
<onlyinclude>'''Primary energy accounting''' adds up all of the energy harvested from [[primary fuel]]s and [[primary energy flow]]s extracted from nature, the total sources of energy. This is different from [[end use energy]] accounting, which examines the energy people directly use in the form of [[secondary fuel]]s and [[energy currencies]]. Two different methods of keeping track of this amount of energy have developed, each of these accounting types are used to highlight different parts of the energy sector. A [[systems approach to energy]] means being aware of both primary energy accounting and end use accounting.</onlyinclude>

[[Primary energy]] accounting is a way of looking at energy use at the [[natural resource]] end. This is energy used to produce secondary fuels and generate electricity. This type of accounting is useful for creating the [[total primary energy supply]] (TPES) of a country and focuses on where the energy is coming from.

[[File:energyflows.png|800px|thumb|Figure 1. This diagram<ref>Created internally by a member of the Energy Education team.</ref> shows how Total Primary Energy Supply (the primary energy) becomes Total Final Consumption (end use energy). Various primary energy sources are combined into the total primary energy supply (TPES). The primary energy is then changed with [[energy conversion technology|energy conversion technologies]] like [[power plant]]s and [[oil refinery|refineries]] to become [[energy currency|energy currencies]].]]


People who hope to downplay the importance of [[hydroelectricity]] will focus on [[primary energy]] and not mention the [[efficiency|thermodynamic inefficiencies]] that affect all of the [[power]] that comes from [[heat engine]]s (just about everything else). This makes hydroelectricity look small.

For example, [[Transportation energy use|transportation energy]] is much smaller portion of primary energy than end use energy. This is because there is very little energy lost converting [[crude oil]] to [[transportation fuel]]s ([[gasoline]], [[diesel]], [[kerosene]]). Conversely, electricity accounts for about three times as much primary energy as end use energy, because most [[power plant]]s have about 33% efficiency. This means they must burn the fuel for 3000 [[MWt]] to create 1000 [[MWe]]. This changes the amount of energy considerably (by a factor of 3) that goes into electricity.

End use energy accounting refers to all energy that is directly consumed by the user. This includes [[electricity]], [[gasoline]], and [[natural gas]]. 

Energy accounting can be a confusing subject, at times, because both end use accounting and primary energy accounting include the same categories, and many of the same energy sources.

==References==
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