The World's #1 Renewable Energy Network for News, Information, and Companies.
Untitled Document

Making Corn Stover Biofuel May Not Be Better than Gas, Says Report

Biofuels made from the leftovers of harvested corn plants are worse than gasoline for global warming in the short term, a study shows, challenging the Obama administration's conclusions that they are a much cleaner oil alternative and will help combat climate change.

A $500,000 study paid for by the federal government and released Sunday in the peer-reviewed journal Nature Climate Change concludes that biofuels made with corn residue release 7 percent more greenhouse gases in the early years compared with conventional gasoline.

While biofuels are better in the long run, the study says they won't meet a standard set in a 2007 energy law to qualify as renewable fuel.

The conclusions deal a blow to what are known as cellulosic biofuels, which have received more than a billion dollars in federal support but have struggled to meet volume targets mandated by law. About half of the initial market in cellulosics is expected to be derived from corn residue.

The biofuel industry and administration officials immediately criticized the research as flawed. They said it was too simplistic in its analysis of carbon loss from soil, which can vary over a single field, and vastly overestimated how much residue farmers actually would remove once the market gets underway.

"The core analysis depicts an extreme scenario that no responsible farmer or business would ever employ because it would ruin both the land and the long-term supply of feedstock. It makes no agronomic or business sense," said Jan Koninckx, global business director for biorefineries at DuPont.

Later this year the company is scheduled to finish a $200 million-plus facility in Nevada, Iowa, that will produce 30 million gallons of cellulosic ethanol using corn residue from nearby farms. An assessment paid for by DuPont said that the ethanol it will produce there could be more than 100 percent better than gasoline in terms of greenhouse gas emissions.

The research is among the first to attempt to quantify, over 12 Corn Belt states, how much carbon is lost to the atmosphere when the stalks, leaves and cobs that make up residue are removed and used to make biofuel, instead of left to naturally replenish the soil with carbon. The study found that regardless of how much corn residue is taken off the field, the process contributes to global warming.

"I knew this research would be contentious," said Adam Liska, the lead author and an assistant professor of biological systems engineering at the University of Nebraska-Lincoln. "I'm amazed it has not come out more solidly until now."

The Environmental Protection Agency's own analysis, which assumed about half of corn residue would be removed from fields, found that fuel made from corn residue, also known as stover, would meet the standard in the energy law. That standard requires cellulosic biofuels to release 60 percent less carbon pollution than gasoline.

Cellulosic biofuels that don't meet that threshold could be almost impossible to make and sell. Refiners would shun the fuels because they wouldn't meet their legal obligation to use minimum amounts of next-generation biofuels. The industry is also seeking to restore a $1 per gallon tax credit that expired late last year.

EPA spokeswoman Liz Purchia said in a statement that the study "does not provide useful information relevant to the life cycle greenhouse gas emissions from corn stover ethanol."

But an AP investigation last year found that the EPA's analysis of corn-based ethanol failed to predict the environmental consequences accurately.

The departments of Agriculture and Energy have initiated programs with farmers to make sure residue is harvested sustainably. For instance, farmers will not receive any federal assistance for conservation programs if too much corn residue is removed.

A peer-reviewed study performed at the Energy Department's Argonne National Laboratory in 2012 found that biofuels made with corn residue were 95 percent better than gasoline in greenhouse gas emissions. That study assumed some of the residue harvested would replace power produced from coal, reducing greenhouse gas emissions, but it's unclear whether future biorefineries would do that.

Liska agrees that using some of the residue to make electricity, or planting cover crops, would reduce carbon emissions. But he did not include those in his computer simulation.

Still, corn residue is likely to be a big source early on for cellulosic biofuels, which have struggled to reach commercial scale. Last year, for the fifth time, the EPA proposed reducing the amount required by law. It set a target of 17 million gallons for 2014. The law envisioned 1.75 billion gallons being produced this year.

"The study says it will be very hard to make a biofuel that has a better greenhouse gas impact than gasoline using corn residue," which puts it in the same boat as corn-based ethanol, said David Tilman, a professor at the University of Minnesota who has done research on biofuels' emissions from the farm to the tailpipe.

Tilman said it was the best study on the issue he has seen so far.

Copyright 2014 Associated Press

Lead image: Corn field via Shutterstock

Untitled Document

Get All the Renewable Energy World News Delivered to Your Inbox - FREE!

Subscribe to Renewable Energy World Magazine and our award-winning e-Newsletter to stay up to date on current news and industry trends.

 Subscribe Now



DOE Releases Final Programmatic Environmental Impact Statement for Hawaii

Jennifer Delony DOE released a final programmatic environmental impact statement for Hawaii to provide federal, state and county gove...

The 800 Ways Taxpayer Money Supports Fossil Fuel Industries

Reed Landberg, Bloomberg As world leaders converge on New York for a United Nations gathering that’s expected to have a strong emphasis on cli...

Makers of Fuel From Plants Feel Forsaken in Obama’s Climate Push

Mario Parker, Bloomberg Producers of motor fuels from plant waste say they have been left behind in President Barack Obama’s push to fight cl...
clean energy

Report: Vermont Clean Energy Sector Jobs Increased 9.8 Percent Since 2013

Jennifer Delony Vermont saw a 9.8 percent increase in clean energy sector jobs since 2013, and jobs in the sector are expected to gro...


Array Technologies Finalizes Shipments to E.ON’s Maricopa West Solar Project

Array Technologies, Inc. (ATI) has completed DuraTrack® HZ shipments to the 20 MW (ac) ...

B.C. Energy Minister to provide keynote at renewables for mines summit.

BC Minister of Energy and Mines to address the challenges of providing alternative powe...

Mining leaders seek renewables solutions at Toronto Summit

The global mining sector is facing a tough business environment with low commodity pric...

American Renewable Energy Institute Gears Up for 12th Annual Summit

"Racing Climate Change: Green Bridge with China, The Road to Paris” is the theme of th...


New Mexico Attracts Jobs and Revenues with Renewable Energy Tax Credit

New Mexico has abundant fossil fuel resources: in 2013, it ranked sixth in the nation for crude oil production, seven...

The Vice President Stole My Show (Not Really)

When I finished my Solar Power International (SPI) panel discussing what future opportunities the panelists saw in so...

The Value Of The Building

If you’re selling efficiency solutions in the built environment, you may find yourself being asked by your pros...

Sewage provides energy through processing

Many nations are investing in new technology to turn sewage waste into usable energy. Japan has recently revised its ...


Copyright 2014 Associated Press


Volume 18, Issue 4


To register for our free
e-Newsletters, subscribe today:


Tweet the Editors! @jennrunyon



Biogas 3: free online trainings on sustainable small-scale biogas f...

The main objective of BIOGAS3 (Sustainable Small-scale biogas production...

International Energy and Sustainability Conference 2015

The fourth International Energy and Sustainability Conference will be he...

2015 AREDAY Summit

The 12th Annual AREDAY Summit, August 8-13th in Snowmass Colorado. Engag...


New coating extends cylinder life 8 times longer than traditional c...

Hydroelectric turbine systems operate in extremely harsh conditions. The...

Clean Energy Patents Maintain High Levels in First Quarter, Solar L...

U.S. patents for Clean Energy technologies from the first quarter of 201...

SAP for Utilities Blog

The Eventful Group produces the annual SAP for Utilites Conference ...


Renewable Energy: Subscribe Now

Solar Energy: Subscribe Now

Wind Energy: Subscribe Now

Geothermal Energy: Subscribe Now

Bioenergy: Subscribe Now