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Topic: EROI

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[Episode #184] – EROI of RE

Oct 26 2022

Do renewable energy sources generate enough energy ‘profit’ to make them worth continued investment? And is any energy profit large enough to run our modern world, as renewables displace fossil fuels?

Some skeptics of the energy transition have claimed that renewables can’t run our world because the net energy they deliver to society is too low. They make this argument drawing from past data for the Energy Returned on Investment (or EROI) for various fuels, which showed high EROIs for extracting fossil fuels, and low EROIs for very early generations of wind and solar technology. However, the historical EROI literature has been plagued with methodological inconsistencies so how reliable is this legacy data for guiding modern outlooks?

In a new paper we discuss in today’s episode, a group of researchers has cleaned up and rectified recent EROI data so that the various fuels can be compared on an apples-to-apples basis. Their new results paint a very different picture from the old literature.

Not only do renewables have sufficiently high EROIs to power our society, they are much higher than the EROIs of the fossil fuels they are replacing! In fact, these results suggest that only through the energy transition can we maintain a functioning society.

To walk us through this new paper, its lead researcher, Dr. David Murphy, an environmental scientist at St. Lawrence University in New York, returns to the show.

In addition to reviewing the results of this new paper, we’ll also talk about some of the other mistaken arguments that are frequently made against the energy transition, and explain why they are wrong.

Geek rating: 9

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[Episode #59] – Lifecycle Assessment

Dec 27 2017

Mini Episode

When we need to compare the environmental consequences of energy technologies — between an internal combustion vehicle or an EV, or between a compact natural gas generator and a big wind farm — what’s the best way to understand the full picture? Should we just look at pollutant emissions? Or should we take a broad view, and consider the total lifecycle, including mining, manufacturing, transport and waste? The latter is what lifecycle assessment (LCA) is all about, and although it can be used to compare very complex sets of things in a helpful way, it can also be abused to suit an agenda.

To really be sure we’re comparing apples with apples, we need to understand the right ways and the wrong ways to do LCA. And then we need to think carefully about the implications of our research, and how to communicate them to a lay audience in such a way that they can inform policy without being misunderstood or misrepresented. It’s a tricky art, but our guest in this episode is an LCA veteran from NREL who can show us the way.

Geek rating: 6

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[Episode #42] – Can Renewables Power the World?

May 3 2017

Mini Episode

Is the net energy of renewables high enough to actually power human civilization? Or will replacing fossil fuels prove too difficult on an energetic basis? What is the state of the art in net energy analysis, and can biophysical economics yet prove to be policy relevant, and not just an arcane field of study that only interests academics? What’s the trajectory of EROI for various fuels, and what’s the right way to compare them?

If you’ve heard that the net energy of renewables is too low to run society, and that as a result energy transition is destined to fail…then you need to listen to this interview with net energy researcher Rembrandt Koppelaar and check out his new research. His findings will probably surprise you.

Geek rating: 8

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[Episode #32] – Resources and Economy

Dec 14 2016

Full Episode

The notion of “decoupling” energy consumption from economic growth has become vogue in policy circles, but how much evidence is there that it’s really happening? If the energy intensity of our economy is falling, are we sure that it’s becoming more efficient, or might we just be offshoring energy-intensive industries to somewhere else…along with those emissions? If energy reaches a certain percentage of total spending, does it tip an economy into recession? Is there a necessary relationship between energy consumption and monetary policy? Is there a point at which the simple fact that we live on a finite planet must limit economic growth, or can economic growth continue well beyond our resource consumption? Can the declining EROI of fossil fuels tell us anything about the future of the economy? And can we have economic growth using clean, low-carbon fuels, or might transitioning to an economy that produces zero net new carbon emissions put the economy into recession and debt?

To help us answer these thorny questions, we turn to an expert researcher who has looked at the relationship between energy consumption and the economy over long periods of time and multiple economies, and found some startling results with implications for the Federal Reserve, for economic policymakers, and for all those who are involved in energy transition.

Geek rating: 8

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