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<onlyinclude>The '''reserves/production ratio''' or '''R/P''' is a method used to assess the size of [[reserve]]s. The value represents the number of years that current reserves would last if their rate of use did not change.</onlyinclude><ref name=boyle>G.Boyle, B.Everett, S.Peake, J.Ramage. (June 15, 2015). ''Energy Systems and Sustainability: Power for a Sustainable Future'', 2nd Ed. Oxford, UK: Oxford University Press, 2012</ref> The value of this ratio changes as the size of the reserve changes. A reserve is defined as the amount of a [[resource]] that can be extracted with current technology, at current prices. If technology improves, or prices increase, the reserves increase.  
<onlyinclude>The '''reserves/production ratio''' or '''R/P''' is a method used to estimate how long [[reserve]]s will last. The value represents the number of years that reserves would last if: their rate of use did not change, no more deposits were discovered, and neither technology nor price change.</onlyinclude><ref name=boyle>G.Boyle, B.Everett, S.Peake, J.Ramage. (June 15, 2015). ''Energy Systems and Sustainability: Power for a Sustainable Future'', 2nd Ed. Oxford, UK: Oxford University Press, 2012</ref> The value of this ratio changes as the size of the reserve changes. A [[reserve]] is defined as all of the deposits of a [[natural resource]] that are economically viable to extract, with current technology and prices. If technology improves, prices increase, or discoveries are made, the reserves increase.  


These R/P ratios are most important when analyzing [[fossil fuel]]s, as it loosely represents how much longer they will last. Current estimates put the reserves/production ratio for coal at 119 years if consumption continues at its current rate, while there is 63 years of natural gas left and only 46 years of oil.<ref name=boyle/> The idea that oil is running out is linked very closely to [[Hubbert's peak]], an estimate about when oil production would peak and how it would fall after a certain point in time.
These '''R/P''' ratios are important when analyzing [[fossil fuel]]s, as it gives a time-scale for how much longer they will last with '''current''' rates of consumption, with no further exploration. While [[oil]] is non-renewable and technically "running out", it's unlikely that humans will ever use anything close to all of the oil in the ground. [[Climate change]] is a far bigger limiting factor for future oil use than the limited amount of oil. See also the discussion of [[Hubbert's peak]] for another interesting perspective on this issue.
[[File:Rp oil by region until 2020.png|center|thumb|750x750px|Figure 1. This graph presents the changes in RP ratio for oil by region. On the left from the year 2020, and on the right the history from 1990 to 2020. The factors that would cause changes would be technological advances and the changes in oil prices.<ref>BP (2021). ''Statistical Review of World Energy''. Available: https://www.bp.com/content/dam/bp/business-sites/en/global/corporate/pdfs/energy-economics/statistical-review/bp-stats-review-2021-full-report.pdf</ref>]]


For more on the idea of reserves and resources, click [[reserve vs resource|here]].
==Inaccuracy in the Ratio==
Although this number can provide an estimate of how many years a natural resource can be extracted, the numbers are only an approximation. First, this value doesn't account for any occurrence of resources that are yet to be discovered (more information on [[Reserve vs occurrence|reserves and occurrences]]). If found, these resources could dramatically increase the amount of a [[fuel]] in known reserves. This would extend the period of time over which a resource is expected to run out. Second, the number doesn't account for potential economic or technological factors that could expand the reserve.<ref name="RE1">Richard Wolfson. (June 18, 2015). ''Energy, Environment, and Climate'', 2nd ed. New York, NY, U.S.A: 2012.</ref> The [[cost]] of fossil fuels could rise or technologies could advance to the point that previously unrecoverable resources could be mined. This would increase the value of the R/P ratio. Finally, R/P ratios do not take into count the changing fossil fuel consumption rates. The estimates likely represent time frames that are too long, meaning if a rise in consumption is accounted for, the R/P ratio should in fact be lower. However, fossil fuel consumption rates could also drop, as climate change forces us to find alternative sources of energy.


==Inaccuracy in the Ratio==
==For Further Reading==
Although this number can sometimes provide an estimate of how much of a certain resource is left, the numbers can be inaccurate. First, this value doesn't account for any resources that are yet to be discovered. If found, these resources could dramatically increase the amount of a [[fuel]] in known reserves. This would extend the period of time over which a resource is expected to run out. Second, the number doesn't account for potential economic or technological factors that could expand the reserve.<ref name="RE1">Richard Wolfson. (June 18, 2015). ''Energy, Environment, and Climate'', 2nd ed. New York, NY, U.S.A: 2012.</ref> The cost of fossil fuels could rise or technologies could advance to the point that certain previously unrecoverable resources could be mined. This would change the value of the ratio. Finally, there is the fact that fossil fuel consumption rates are growing, so estimates today likely represent time frames that are too long. The fossil fuel consumption rates could also drop, if alternative fuel sources become available.
*[[Reserve vs occurrence]]
*[[Reserve]]
*[[Fossil fuel]]
*[[Hubbert's peak]]
*[[Renewable and sustainable energy]]
*Or explore a [[Special:Random|random page]]


==References==
==References==
{{reflist}}
{{reflist}}
[[Category:Uploaded]]
[[Category:Uploaded]]

Revision as of 23:05, 15 May 2026

The reserves/production ratio or R/P is a method used to estimate how long reserves will last. The value represents the number of years that reserves would last if: their rate of use did not change, no more deposits were discovered, and neither technology nor price change.[1] The value of this ratio changes as the size of the reserve changes. A reserve is defined as all of the deposits of a natural resource that are economically viable to extract, with current technology and prices. If technology improves, prices increase, or discoveries are made, the reserves increase.

These R/P ratios are important when analyzing fossil fuels, as it gives a time-scale for how much longer they will last with current rates of consumption, with no further exploration. While oil is non-renewable and technically "running out", it's unlikely that humans will ever use anything close to all of the oil in the ground. Climate change is a far bigger limiting factor for future oil use than the limited amount of oil. See also the discussion of Hubbert's peak for another interesting perspective on this issue.

Figure 1. This graph presents the changes in RP ratio for oil by region. On the left from the year 2020, and on the right the history from 1990 to 2020. The factors that would cause changes would be technological advances and the changes in oil prices.[2]

Inaccuracy in the Ratio

Although this number can provide an estimate of how many years a natural resource can be extracted, the numbers are only an approximation. First, this value doesn't account for any occurrence of resources that are yet to be discovered (more information on reserves and occurrences). If found, these resources could dramatically increase the amount of a fuel in known reserves. This would extend the period of time over which a resource is expected to run out. Second, the number doesn't account for potential economic or technological factors that could expand the reserve.[3] The cost of fossil fuels could rise or technologies could advance to the point that previously unrecoverable resources could be mined. This would increase the value of the R/P ratio. Finally, R/P ratios do not take into count the changing fossil fuel consumption rates. The estimates likely represent time frames that are too long, meaning if a rise in consumption is accounted for, the R/P ratio should in fact be lower. However, fossil fuel consumption rates could also drop, as climate change forces us to find alternative sources of energy.

For Further Reading

References

  1. ↑ G.Boyle, B.Everett, S.Peake, J.Ramage. (June 15, 2015). Energy Systems and Sustainability: Power for a Sustainable Future, 2nd Ed. Oxford, UK: Oxford University Press, 2012
  2. ↑ BP (2021). Statistical Review of World Energy. Available: https://www.bp.com/content/dam/bp/business-sites/en/global/corporate/pdfs/energy-economics/statistical-review/bp-stats-review-2021-full-report.pdf
  3. ↑ Richard Wolfson. (June 18, 2015). Energy, Environment, and Climate, 2nd ed. New York, NY, U.S.A: 2012.
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