How Switchgrass Fuels Power Plants

This prairie grass may prove to be an especially effective bio-fuel, learn how switchgrass fuels power plants.
By the MOTHER EARTH NEWS Editors
February/March 2000
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Farmers in Iowa have found that switchgrass, a marginal crop grown mostly for ground cover and hay bales, can also fuel power plants.
ILLUSTRATION: MOTHER EARTH NEWS STAFF


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The prairie grass switchgrass fuels power plants and has become an effective bio-fuel. 

Farmers in Iowa have found that switchgrass, a marginal crop grown mostly for ground cover and hay bales, can also fuel power plants.

Indeed, the waist-high prairie grass switchgrass fuels power plants and may prove to be an especially effective bio-fuel, given that it has already shown several advantages over its competition. While short-rotation woody crops like poplars take years to grow, switchgrass can be harvested annually; and, unlike corn, its extensive root system helps to prevent erosion and sustain soil health. Switchgrass also appeals to environmentalists who point to its value as a "carbon sink"; that is, it sequesters carbon in the soil and reduces C02 in the air.

"For the last ten years, the motivating factor for growing switchgrass in much of the central United States has been conservation/preservation," says Iowa State University Assistant Professor of Agronomy Lee Burras. "Now those lands are coming back into production and farmers are looking for [crop] alternatives. That's where the energy idea becomes very appealing."

In 1996, with support from tile U.S. Department of Energy, Chariton Valley Resource Conservation & Development Inc. began efforts to develop switchgrass into an energy cash crop. The company plans to "test drive" the bio-fuel this spring at southern Iowa's Ottumwa Generating Station, where the brown, hay-like grass will be co-fired with coal. So far, researchers have found that one pound of switchgrass can replace about three quarter of a pound of coal, generating about 7,500 BTUs. That translates to one megawatt (MW) of electricity for every 1,500 acres of switchgrass. The goal at Ottumwa will be to use the herbaceous crop to generate 35 MW of electricity, or about 5% of the plant's total output, during testing.

If all goes well, a wider-scale switch to switchgrass could be just a planting season away.

—Peter Carter 








Post a comment below.

 

Keith Karolyi
3/4/2011 3:14:06 PM
While I like the idea of a renewable biofuel feedstock that protects the land, I don't think most readers have ever grown this crop and, therefore, don't realize that the extensive root system that stabilizes the soil against erosion also makes it nearly impossible to remove from a field once it gets established. It's really a permanent planting that needs arable farmland to produce which means it displaces food production wherever it's grown. Whether we throw our corn and sugar beets into the fuel supply or simply not grow them in favor of another fuel crop gives us the same result: Less food grown and higher food prices due to shorter supply and we still won't be able to grow enough switchgrass to meet all of our energy needs without running out of farmland. It's a great deal for the farmer but it effectively burns our food supply. Just my 2 cents worth.








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