Renewable Energy

New perspectives on the energy return on (energy) investment (EROI) of corn ethanol: Part 1 of 2

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Over the past decade there has been considerable debate on corn ethanol, most focused on whether it is a net energy yielder…On one side are Pimentel (2003) and Patzek (2004) who claim that corn ethanol has an EROI below one energy unit returned per energy unit invested, and on the other side are a number of studies claiming that the EROI is positive, reported variously as between 1.08 and 1.45 (Wang et al. 1997; Wang 2001; Shapouri et al. 2002; Graboski 2004; Shapouri 2004; Oliveira et al. 2005; Farrell et al. 2006; Wang et al. 2007). Even with numerous publications on this issue, disagreement remains as to whether corn ethanol is a net energy yielder.

A Deutschland disconnected from its Volk

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As elsewhere in western Europe, the advanced liberal consumer democracies are ever more unable (politically unwilling) to implement genuine change. Deutschland’s rulers in Berlin firmly believe that techno-managerial innovation (and a hefty dose of financial risk-taking) will continue to provide cures for current ideas of what is unsustainable. As has happened time and again in Europa’s history of nations, from the mid-19th century onwards, the costs of such ‘revolutions’ will be externalised elsewhere (east and south), and the ecological sustainability that Germany’s admirable network of communes have long been admired for will remain out of reach of the country’s policy and practice.

Revisiting the Fake Fire Brigade Part 2: Biomass – A Panacea?

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In many resource discussions, biomass emerges as a solution that allows us to continue many activities currently powered by fossil fuels: First, to move cars, trucks, machinery and planes when oil runs out or becomes too expensive. Second, to provide flexibility in electric power generation, i.e. when other sources are stochastic and inflexible, biomass would provide the necessary gap-filling power. Third, to heat our homes, after natural gas production declines. There are many estimates of future uses for biomass, and many new technologies that are making their first baby-steps, quite a few of them promising and worth trying.

EROEI of electricity generation

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“Energy Return on Energy Investment (EROEI) is calculated as the ratio between energy inputs and energy outputs for an energy generating technology. A process that uses more energy than it produces is by definition unsustainable in the long term. Technologies which require fuel generally have a lower EROEI than those which can extract “free” energy from the environment (wind, waves, tides, sunlight). As part of this study we have a carried out a review of published EROEIs and have found a high EROEI for marine technologies, lower EROEIs for solar and nuclear power, and still lower for coal and gas.

Renewables & efficiency – July 16

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-Germany targets switch to 100% renewables for its electricity by 2050
-Report sees need for 500 additional biofuels plants
-No link between wind turbines and health: report
-Residents reject wind farm health findings
-Locally Owned Wind Power: Quaint it Ain’t

The ways of the Force

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Luke Skywalker had to master the ways of the Force to save the galaxy. We face a similar challenge — mastering the ways of energy, which are surprisingly counterintuitive to people raised in current ways of thinking — in order to make use of the limited options still open to us in an age of declining energy supplies.

Merlin’s time

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People in the Dark Ages filled in the gaps in the very limited knowledge base available to them with the help of wizards and soothsayers. As we close in on a future for which most people are hopelessly unprepared, a new kind of wizard — a green wizard, adept in the forgotten arts of appropriate tech — may be one of the things that a deindustrializing world needs most.

A tepid plea for unspecified change

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Last night’s presidential speech on the Gulf oil spill had been pre-billed by the Washington Post as Barack Obama’s “Jimmy Carter moment.” But reading any of Carter’s speeches (a good one to start with is that of April 18, 1977) side by side with last night’s bromide is an invitation to nostalgia and bitter disappointment.