World Energy Consumption: Understanding the Differences in Units

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Discussion Overview

The discussion centers on the differences in units used for world energy consumption statistics, specifically the comparison between energy generated (in TWh) and primary energy consumed (in Mtoe). Participants explore the implications of these differences and the relationships between various forms of energy consumption and generation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions why energy generated and consumed are expressed in different units, TWh for generation and Mtoe for consumption.
  • Another participant inquires whether coal and oil are classified under "Energy Generated."
  • There is a suggestion that the 12000 Mtoe of primary consumption implies that a significant amount of energy is burned to produce the 20000 TWh of electricity.
  • Participants discuss where fuel burned in motor vehicles fits into these statistics.
  • One participant interprets that only a fraction of the fuel is converted into electric energy, possibly accounting for energy used in mining and transporting coal.
  • A later reply references historical data indicating that a significant portion of energy consumption is not solely for electricity generation, noting inefficiencies in power plants.
  • There is a clarification sought regarding whether renewable energies are included in the energy consumption figures.
  • Another participant expresses an expectation that the consumption estimate includes energy from all sources unless specified otherwise.

Areas of Agreement / Disagreement

Participants express various viewpoints regarding the classification of energy sources and the implications of the statistics, with no consensus reached on the interpretations of the data or the categorization of energy types.

Contextual Notes

Participants acknowledge limitations in the information available, including the lack of clarity on whether certain energy sources are included in the statistics and the potential for misinterpretation of the data.

Who May Find This Useful

Individuals interested in energy statistics, energy generation and consumption, and the implications of different energy sources may find this discussion relevant.

Young Learner
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Today I came across a statistical report of world energy consumption. There was a tab named energy generated and the values were given in TWh. There was a tab named Primary energy consumed and the values were given in Mtoe. I saw that the energy generated by the world is around 20000 TWh and the Primary consumption is around 12000 Mtoe.
My questions are:
1. Why is that the Energy generated and the energy consumed are expressed in two different terms?
2. I came to know that 1Mtoe=11.63TWh, the 12000Mtoe=139560TWh. How come the consumption is so high when the generation is only 20000TWh
 
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Would coal and oil be classified under "Energy Generated"?
 
Does that mean 12000 Mtoe is burned to produce 20000 TWh of energy?
 
Where would the fuel burnt in motor vehicles be categorized in these statistics?
 
Do you mean that they have specified the primary fuel consumed which also includes the fuel used for transportation.
That was an electrical energy statistics report
 
That is my interpretation, though based on scant information. Otherwise, the conclusion is that only 1/7 th of the fuel is converted into electric energy. Maybe they take into account the energy used in mining and transporting the coal, including that as primary consumption?
 
Last edited:
I was not able to upload the entire file. So, I just cropped it.
Just see whether you'd be able to come to a conclusion from the following data
 

Attachments

Wikipedia indicates that world production of electrical power in 2008 was 20,261 TWh while world consumption of energy was 143,851 TWh (12,369 Mtoe). These numbers are consistent with the values specified in the opening post. A better label for that "energy production" tab would have been "electrical power production".

Does this mean that only 1/7 of the world's energy annual consumption is used for the purpose of generating electricity? No. Actually it's about 36%. Power plants aren't 100% efficient; the second law of thermodynamics gets in the way. A good chunk (61%) of the energy consumed in the production of electricity is turned into heat rather than electricity.
 
Fine, I understand. Just one clarification, Does the consumption of energy includes renewable energies such as hydro and tidal or it is just confined to coal and oil.
 
  • #10
Unless the document indicates they excluded some energies, I expect it would be an estimate of energy from all sources.
 
  • #11
Thank You all for the instant replies. :)
 
  • #12
Since you're interested in the subject, here's a link i enjoyed.
It's from 2007 when world use was about a cubic mile of oil per year. They try to put that in some perspective.

ncmo01_0.gif


http://www.theoildrum.com/node/2186

It leads to to other interesting links..
 
Last edited by a moderator:
  • #13
Informative thread Jim.
 

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