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- Oil choke points vulnerable to war, chaos, terrorism, accidents, & piracy
- Nuclear weapons must be reduced or we risk nuclear winter
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- Peak Oil is Officially Here! World oil production peaked November of 2018
- Wood, the fuel of preindustrial societies, is half of EU renewable energy
- Rare Earth updates: recent research on why complex & intelligent life are rare in the Universe
- Book review of “Chip War” and the Fragility of microchips
- The tremendous material and energy toll of the digital economy
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- What percent of Americans are rational?
- Book review of Lights Out. A Cyberattack. A Nation Unprepared. Surviving the Aftermath
- Off-Road vehicles & equipment need diesel fuel
- Book review of “Prime Movers of Globalization: the History & Impact of Diesel Engines & Gas Turbines”
- Mental Health. Coping with the future: notes from Jackson & Jensen’s “An Inconvenient Apocalypse”
Tag Archives: EROEI
Why studies come up with different Energy Returned on Invest (EROI) results: can it be fixed?
[ There are many issues with biofuels beyond their trivial to negative energy return on investment (EROI). In Peak Soil I point out that current industrial farming techniques are destroying topsoil about 15 times faster than pre-fossil fuel economies — … Continue reading
Posted in Biofuels, Biomass EROI, Charles A. S. Hall
Tagged biomass, EROEI, EROI, ethanol
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EROI explained and defended by Charles Hall, Pedro Prieto, and others
[ If you found this post interesting, the following posts are even better (more detailed and in-depth): Tilting at Windmills, Spain’s disastrous attempt to replace fossil fuels with Solar PV, Part 1 Tilting at Windmills, Spain’s disastrous attempt to replace … Continue reading
Posted in Charles A. S. Hall, EROEI Energy Returned on Energy Invested, Pedro Prieto
Tagged Charles Hall, EROEI, EROI, Pedro Prieto
3 Comments
Tilting at Windmills, Spain’s disastrous attempt to replace fossil fuels with Solar PV, Part 2
[ Pedro Prieto presented an update on June 20, 2017 at the International Society for Biophysical Economics “Spain’s Solar Revolution Revisited: six years later” here: Pedro-Prieto_ISBPE_2017-Spains-solar-revolution-revisited.pdf. See the pdf for more information Losses in book overestimated and revised Before / … Continue reading
Posted in Charles A. S. Hall, EROEI Energy Returned on Energy Invested, Pedro Prieto, Photovoltaic Solar, Solar EROI
Tagged capacity credit, EROEI, EROI, solar PV
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Are biofuels a sustainable and viable energy strategy?
Preface. In 2000, Melanie Kenderine at the U.S. Department of energy stated that: “This nation has abundant biomass resources (grasses, trees, agricultural wastes) that have the potential to provide power, fuels, chemicals and other bio-based products” (136). That’s a good … Continue reading
Posted in Biofuels, EROEI Energy Returned on Energy Invested
Tagged biofuel, EROEI, EROI, net energy, subsidies
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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
Posted in EROEI Energy Returned on Energy Invested
Tagged california, EROEI, EROI, net energy, oil
1 Comment
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
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
Posted in EROEI Energy Returned on Energy Invested, Threats to oil supply
Tagged deepwater, EROEI, EROFI, EROI, natural gas, oil
1 Comment
How much net energy return required to prevent collapse?
Preface. 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
Posted in Charles A. S. Hall, EROEI Energy Returned on Energy Invested, Net Energy Cliff
Tagged energy return on investement, EROEI, EROI, net energy cliff
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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
Posted in EROEI Energy Returned on Energy Invested, U.S. Congress Energy Policy
Tagged energy policy, EROEI, EROI, net energy
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Tilting at Windmills, Spain’s disastrous attempt to replace fossil fuels with Solar PV, Part 1
Book review by Alice Friedemann at energyskeptic of “Spain’s Photovoltaic Revolution. The Energy Return on Investment”, by Pedro Prieto and Charles A.S. Hall. 2013. Springer. Conclusion: the EROI of solar photovoltaic is only 2.45, very low despite Spain’s ideal sunny … Continue reading