Harvesting a new kind of fuel

  • Article by: DAVID SHAFFER , Star Tribune
  • Updated: August 10, 2011 - 2:48 PM

An Iowa town is getting ready for what could be the nation's first cellulosic ethanol plant. Farmers are learning to harvest cornfield biomass to feed it.

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A truck driver straps down round bales of corn crop residue at a massive storage yard in Emmetsburg, Iowa.

Photo: Richard Sennott, Star Tribune

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EMMETSBURG, IOWA - Each fall in corn country, big combines prowl through the fields, stripping the valuable kernels from ears and spitting out bits of cornstalk, leaves and empty cobs.

The residue, which used to lie on the ground and rot, has become a money crop for the next generation of biofuel.

Poet LLC, the nation's leading ethanol producer, says it is determined to open a commercial-scale cellulosic ethanol plant in 2013 next to its existing corn-ethanol plant in this northern Iowa community. The $250 million project could be the first such plant in the nation. Last month, the U.S. Energy Department conditionally committed to a $105 million loan guarantee for it.

"The technology is there -- it is definitely to the point where we can build the best-in-class plant, and the trick is getting these plants up," said Brooke Coleman, executive director of the Advanced Ethanol Council, which represents many of the approximately dozen U.S. companies working to commercialize cellulosic ethanol.

Cellulosic ethanol is no different from corn ethanol except that it can be made from non-food material, including wood waste, garbage, wheat straw, prairie grass and the residue from corn called stover. At least 25 companies around the world, including Poet, have pilot or demonstration cellulosic ethanol plants, Coleman said.

Four years ago, the federal government predicted a rapid ramp-up in U.S. production to 250 million gallons of cellulosic biofuel by 2011. As recession hit and lenders got the jitters, not a single commercial cellulosic ethanol plant got built -- and just 4.1 million gallons is projected to be produced this year.

Poet, based in Sioux Falls, S.D., says it hopes to break ground this fall on the 25 million-gallon-a-year cellulosic ethanol plant known as Project Liberty.

The project already is causing profound changes in Emmetsburg, a town of 3,578 surrounded by corn and soybean fields. What's happening here offers a glimpse at Poet's vision for its 26 other Midwestern corn-ethanol plants, including four in Minnesota.

At each plant, the company says, a companion cellulosic plant eventually will be built. Ethanol from corn kernels won't go away. Instead, farmers would expand into biomass harvesting and earn more money from their cornfields.

Economics of baling 'stover'

Harvesting the new money crop turns out to be not so simple. That's why Poet began working on its biomass supply three years before it expects the plant to open.

"I didn't think it would be this hard," said Emmetsburg farmer Bruce Nelson, describing his work last fall and winter to bale and transport thousands of tons of stover to Poet's massive storage yard at the edge of town.

The yard, with long lines of round bales stacked four high, was built by Poet last year for $3.5 million and occupies an area the size of 17 football fields. It can hold 40,000 bales of stover. Most are roughly 5 feet in diameter and 6 feet wide. One round bale can make 40 to 60 gallons of ethanol.

Yet the yard holds only enough biomass to supply the plant for a few weeks. About 15 times that much residue will need to be gathered and trucked all year long from cornfields within 30 miles, Poet says. It is seeking residue from about one in four corn acres in that radius.

Stover is collected like hay from fields in late fall after the harvest -- a time when early snows can bury it. That worries some people working on cellulosic ethanol.

"We felt it was too risky to bet your whole plant on," said Douglas Rivers, director of research and development for ICM, an ethanol company based in Colwich, Kan., that will test a range of crops at a pilot cellulosic plant being built in St. Joseph, Mo.

Jim Sturdevant, who directs Poet's Project Liberty, said he isn't alarmed about the risk. "Even with some snow on the ground, the farmer can come along later and pick up ... corn-crop residue," he said.

Many farmers didn't harvest stover in the past. It's used for cattle bedding and mixed with feed, but Emmetsburg and many other places in the Corn Belt didn't have a big market for it. To create one, Poet last year paid 85 local farmers to harvest 56,000 tons of it, and will expand collections this fall. Most bales were burned for energy at another Poet plant since they weren't needed for ethanol.

After farmers collect stover, the bales are stored temporarily at the edge of fields. But problems happened when farmers tried to move the bales to the plant over the winter. "What we found is that the bales freeze to the ground," said Nelson, who with a friend launched a contract-baling business last year.

Kyle Elbert, 20, who lives on a family farm south of Emmetsburg, entered the biomass business last year, buying specialized baling and loading equipment and contracting with local farmers. This fall he plans to buy another baling machine, hire two full-time employees and haul 10,000 stover bales to Poet.

"It is time-consuming and not much fun," Elbert said of his long winter of loading, strapping down and hauling corn bales on flat-bed trucks. But he said he is making money.

Technology and investment

The other big challenges for cellulosic ethanol have been technology and financing.

The green parts of corn, unlike the starch in kernels, don't easily give up their two kinds of sugar for fermentation into alcohol. Acid, then enzymes are required to strip glucose and xylose from plant fiber. Then the sugars are fermented simultaneously with special yeasts, said Dave Bushong, a chemical engineer who directs Poet's research center and cellulosic pilot plant in Scotland, S.D.

"It is a new venture," he said of the push to commercial production. "We have done everything we can do to de-risk it .... There are still challenges."

Poet has said it brought down the cost per gallon from $4.13 to $2.35, though it's still more expensive than corn ethanol. Bushong said Poet has technology to reuse water and acids in the plant, and to produce methane, or natural gas, from leftover plant residue called lignin to power the new plant and the existing one. Poet says it has 22 patents pending on various technologies for Project Liberty.

"Lenders have been reluctant to jump into this for several reasons," said Sturdevant, the Project Liberty manager. "One is that it is brand new, innovative technology, and of course there is always risk. Another is that the downturn of economy in general hurt lending."

The federal and state governments committed to paying 38 percent of the plant's construction cost on top of the tentative $105 million federally guaranteed loan to Poet. The company also got $17 million in state and federal grants for cellulosic research. Poet put another $40 million of its own into R&D.

Michael Cox, an analyst who tracks clean technology companies for Piper Jaffray, said investors have been hesitant about financing corn ethanol facilities, but have shown interest in renewable ventures.

"The economics are making sense," Cox said of cellulosic ethanol. "These facilities are being built because they can make money without jeopardizing food versus fuel."

Poet's plant in Iowa has a shot at being the first U.S. commercial cellulosic ethanol plant, though other companies are moving ahead. Two large cellulosic plants are being built in Europe; others are proposed in the United States, including one in Hugoton, Kan., by Abengoa Bioenergy, and another in central Florida by BP Bioenergy.

"Nobody has the first one open yet," said Cynthia Bryant, director of global business development for Denmark-based Novozymes, a major supplier of enzymes to the ethanol industry. "It is anyone's crown to win."

David Shaffer • 612-673-7090

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