Energy returned on energy invested | Wikipedia audio article
Channel: wikipedia tts
Date: 27/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Energy_returned_on_energy_invested


00:01:19 1 History
00:02:02 2 Application to various technologies
00:02:13 2.1 Photovoltaic
00:03:46 2.2 Wind turbines
00:04:10 2.3 Oil sands
00:04:52 3 Non-manmade energy inputs
00:05:50 4 Competing methodology
00:07:08 5 Relationship to net energy gain
00:08:52 6 Economic influence
00:12:25 7 Criticism of EROEI
00:15:32 8 Additional EROEI Calculations
00:17:17 9 ESOEI
00:18:05 10 EROEI under rapid growth
00:20:29 11 See also



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SUMMARY
=======
In energy economics and ecological energetics, energy returned on energy invested (EROEI or ERoEI), or energy return on investment (EROI), is the ratio of the amount of usable energy (the exergy) delivered from a particular energy resource to the amount of exergy used to obtain that energy resource.Arithmetically the EROEI can be defined as:

  
    
      
        E
        R
        O
        E
        I
        =
        
          
            
              Energy Delivered
            
            
              Energy Required to Deliver that Energy
            
          
        
      
    
    {\displaystyle EROEI={\frac {\hbox{Energy Delivered}}{\hbox{Energy Required to Deliver that Energy}}}}
  .When the EROEI of a source of energy is less than or equal to one, that energy source becomes a net "energy sink", and can no longer be used as a source of energy, but depending on the system might be useful for energy storage (for example a battery). A related measure Energy Stored On Energy Invested (ESOEI) is used to analyse storage systems.To be considered viable as a prominent fuel or energy source a fuel or energy must have an EROEI ratio of at least 3:1.