Category Archives: EROEI Energy Returned on Energy Invested

California oil EROI dropped from 6.5 to 3.5 by 2005

Brandt, A. R. October 12, 2011. Oil Depletion and the Energy Efficiency of Oil Production: The Case of California. Sustainability 2011, 3, 1833-1854 [ Brandt estimates the energy return on investment (EROI) dropped from ~6.5 in 1955 to ~3.5 fifty … Continue reading

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Hall and Lambert: EROI of different fuels and the implications for society

[ Excerpts from the Hall, Lambert, and Balogh EROI paper. You may want to read the original paper here since I’ve left out charts, figures, and text.  In my opinion, EROI is important because it is  due diligence – society ought to … Continue reading

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Energy return of ultra-deepwater Gulf of Mexico oil and gas

Moerschbaecher, M., John W. Day Jr. October 21, 2011. Ultra-Deepwater Gulf of Mexico Oil and Gas: Energy Return on Financial Investment and a Preliminary Assessment of Energy Return on Energy. Sustainability 2011, 3, 2009-2026 [Excerpts from this 18 page paper … Continue reading

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Tar sand EROI 2013 Poisson and Hall

Alexandre Poisson, Charles A. S. Hall. 2013. Time Series EROI for Canadian Oil and Gas. Energies 2013, 6, 5940-5959 [ This is an extract from this 20-page paper. Tar sands are the hope offered by techno-optimists that a great deal … Continue reading

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How much net energy return is needed to prevent collapse?

[ Charles Hall, one of the founders of EROI methodology, initially thought an EROI of 3 was enough to run modern civilization, which is like investing $1 and getting $3 back. But after decades of research, Hall concluded an EROI … Continue reading

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Why aren’t net energy and Energy Returned on Invested the basis of U.S. energy policy?

[ David Murphy doesn’t answer this question, but does give the history of EROI and more importantly, what this means for oil production and society.  If we are going to spend money on fossil alternatives, wouldn’t it make sense to … Continue reading

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Tilting at Windmills, Spain’s disastrous attempt to replace fossil fuels with Solar Photovoltaics

Book review of “Spain’s Photovoltaic Revolution. The Energy Return on Investment”, by Pedro Prieto and Charles A.S. Hall. 2013. Springer. Reviewed by Alice Friedemann, www.energyskeptic.com, last updated May 26, 2016 UPDATES: 2016-05-26 The real EROI of photovoltaic systems: Professor Hall … Continue reading

Posted in Alternative Energy, Alternative Energy Resources, Charles A. S. Hall, Debt, Electric Grid, Energy, EROEI Energy Returned on Energy Invested, Pedro Prieto, Photovoltaic Solar, Solar, Solar EROI | Tagged , , , , , , , , | 26 Comments

Wind EROI range and payback time (also solar, NG, geothermal, hydro, coal)

[Clearly Energy Returned on Invested (EROI) research needs to have common standards because results vary by orders of magnitude. Taking the “average” is not going to produce the best guess because outliers skew the average up  substantially.  The EROI of … Continue reading

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A review of life cycle assessments on wind energy systems by Simon Davidsson 2012

[below is a very short excerpt of this 22 page paper, I was interested in how much recycling can contribute to a high EROI but there are many other important points made in this paper] Davidsson, S., Höök, M., Wall, … Continue reading

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Implications of declining EROI on oil production 2013 by David J. Murphy

[ To “see” declining EROI and the end of cheap energy, check out these photos of The Tallest structure ever moved by Mankind, a Norwegian natural gas offshore platform ] Murphy, David J. December 2, 2013. The implications of the … Continue reading

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