Category Archives: EROEI Energy Returned on Energy Invested

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

Murphy, David J. December 2, 2013. The implications of the declining energy return on investment of oil production. Trans. R. Soc. A 2014 372 [This is a great paper on EROI, highly recommended. Without EROI studies, we risk building energy … Continue reading

Posted in EROEI Energy Returned on Energy Invested, Net Energy Cliff, Other Experts | 1 Comment

Peak Oil in the Congressional record: Overview

Peak Oil in the Congressional record: Overview by Alice Friedemann, energyskeptic.com June 11, 2015 Even the most ardent techno-optimists and economists admit there are limited supplies of fossil fuels, but that we don’t need to worry for a long time. … Continue reading

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Critique of LCA & EROI Wind research

[This paper criticizes  LCA and EROI wind studies] Notes from 22 page: Davidsson, S., Höök, M., Wall, G. 2012. A review of life cycle assessments on wind energy systems. The International Journal of Life Cycle Assessment.         … Continue reading

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Mined Oil sands EROI 5, in-situ 2.9, or 1 if refinement, transportation, & environmental costs included

Nuwer, R. Feb 19, 2013. Oil Sands Mining Uses Up Almost as Much Energy as It Produces. InsideClimate News. EROI SURFACE MINED oil sands (20% of reserves) EROI 5  according to J. David Hughes research released Tuesday. EROI 5.5 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 April 11, 2015 with responses from Prieto on criticism received at the 2015 … Continue reading

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

EROI negative for Coal-to-Liquids (CTL) at Shenuha Direct Coal Liquefaction plant

Kong, Z. et al. 23 January 2015. EROI Analysis for Direct Coal Liquefaction without and with CCS: The Case of the Shenhua DCL Project in China. Energies 8(2): 786-807.   Many nations see coal-to-liquids (CTL) as a way to avoid … Continue reading

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Large agribusiness gets corporate welfare via illegal ethanol subsidies

What more proof is needed that the Energy Returned on Energy Invested of ethanol is negative?  They’re losing money and getting corporate welfare to keep the scam going, meanwhile destroying prime topsoil, poisoning the land with pesticides, and eutrophying the … Continue reading

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The Oiliness of Everything: Invisible Oil and Energy Payback Time.

The Oiliness of Everything: Invisible Oil and Energy Payback Time By Alice Friedemann, www.energyskeptic.com August 23, 2014 (last update 8-28-2015) Just as fish swim in water, we swim in oil.  You can’t understand the predicament we’re in until you can … Continue reading

Posted in Agriculture, Alternative Energy, An Overview, Antecedents, EROEI Energy Returned on Energy Invested, Food, Wind | 7 Comments