ELM SPRINGS -- Plans to build Arkansas' first wind farm have sparked interest and excitement in town and across the state, though some wind power experts cautioned against overselling the project.
Representatives of Dragonfly Industries International, a Texas wind energy company, told city officials last month they hope to build dozens of turbines on more than 300 acres of rural land about a mile west of Elm Springs at a cost of at least $100 million, according to City Council and Planning Commission minutes. Power could flow to tens of thousands of homes with the farm's expected capacity of 80 megawatts.
To learn more about Dragonfly Industries International, visit diiturbines.com
Top 10 states
One megawatt of power is enough to sustain hundreds of households, though the precise number depends on region, time of year and other factors. Arkansas is one of 11 states that doesn’t produce wind energy.
State Capacity (in MW)
Source: U.S. Department of Energy, as of September 2014
How wind power works
For thousands of years, windmills have harnessed the mechanical energy of wind to grind grains and do other work. Wind turbines work differently, instead transforming mechanical energy into electricity. They do this by taking advantage of a principle in physics called induction.
Moving a piece of conductive material, such a copper wire, around in a magnetic field in certain ways can induce, or cause, an electrical current to flow through that wire. In a wind turbine, the turning blades spin coils of wire in between strong magnets inside the turbine’s tower, creating an electric current that can flow out into the power grid.
Source: Staff report
Company leaders hope Elm Springs would annex the land if the project goes forward, bringing a tax boon to this town of fewer than 2,000 people, according to the minutes.
"This being what it is kind of put us on the map, so to speak," Mayor Harold Douthit said last week. "It could be a very positive effect and influence on our little town here."
Firm details are hard to come by for now. The company hasn't met with city officials since mid-December, and Cody Fell, a company spokesman, said Dragonfly's CEO and others were unavailable to comment. The company launched in Frisco, Texas, but plans to move to Northwest Arkansas in anticipation of the project, according to the City Council minutes.
"I do think that first presentation was well received by the council," Alderman Kevin Thornton said. "Everyone seemed to look forward to hearing more about the project. I think we're just in kind of a holding pattern."
Dragonfly plans to buy the land from Chambers Bank in Danville. It's valued at about $36,000, according to the Washington County Assessor's Office, though its asking price could be in the millions. Calls to the bank requesting comment Friday weren't returned.
Dragonfly's attempt would be the third since 2008 to bring a wind energy project into the state's northwest corner.
A previous version of this story incorrectly stated the number of companies that have tried to bring wind energy projects to the area. The error has been corrected.
Kansas-based TradeWind Energy tried in 2008 to build 150 turbines in Searcy County, three counties east of Washington County, according to the Harrison Daily Times. The same year the company also considered a wind farm in Benton County. Both projects fell through -- Benton County's because of concerns over the environmental impact of construction, Searcy County's because not enough customers showed interest.
Bringing wind energy to Arkansas is a "risky" business, Frank Kelly, board chairman for the Arkansas Renewable Energy Association, said last week.
"I wouldn't advise anyone doing it," he said, adding solar power seemed like a better investment, unless a company wants to build turbines reaching the steadiest winds 450 feet up. Dragonfly's turbines would be 100 feet tall, according to the City Council minutes.
The country's best wind energy potential is in the Great Plains, between north Texas and North Dakota, according to the U.S. Department of Energy. Wind there reaches an annual average of up to 18 mph at 240 feet up. Arkansas' windiest region is the northwest, with an average windspeed about 14 mph.
Despite the risk, Kelly said he'd be happy if wind power stuck this time around. Glen Hooks, director of the Sierra Club of Arkansas, was even more enthusiastic.
"Other than our hydropower plants, it'd be the first renewable energy of any kind," Hooks said, calling the plan "exciting." The U.S. Environmental Protection Agency is encouraging states to move away from coal power, which could edge out some coal plants and leave room for jobs and economic development on the renewable side, he said.
"This is the perfect example," Hooks said of the Dragonfly plan. He pointed to LM Wind Power, a Danish company that's one of the largest turbine-blade suppliers in the world and has a Little Rock factory and sales office. Construction of a wind farm needs "a lot of steel and a lot of jobs" in the area, Hooks said.
Arkansas' wind potential also is higher than earlier estimates showed thanks to better turbines, Hooks said. A 2014 report from the Energy Department and the Southeastern Wind Coalition found Arkansas could supply all of its energy use from wind alone with today's technology.
American wind power has grown continuously in the past decade, providing more than 4 percent of the nation's generated electricity in 2014, according to the U.S. Energy Information Administration. More than 15 million homes are powered by wind, the highest level ever and almost double the nation's wind capacity in 2009.
For now, Arkansas buys its wind energy from Kansas, Oklahoma and other states. Dragonfly's proposal comes as Clean Line Energy Partners is waiting for federal permission to build a 3,500-megawatt line from the Oklahoma panhandle to Tennessee and provide even more wind power to Arkansas and the rest of the South. The line would enter Arkansas in Crawford County, just south of Washington County.
If approved, construction of the $2 billion line could be finished by 2018, according to Clean Line.
A Better Turbine?
Mock-ups on Dragonfly's website show the company intends to use turbines that look something like jet engines, known in the industry as shrouded or ducted turbines. A cylindrical shell would extend forward and backward from the rotor. Units would be mounted in pairs on either side of each tower and could be lowered to the ground in high wind, according to the Elm Springs City Council minutes.
More conventional turbines have three blades extending outward from the center hub with no covering.
A handful of companies nationwide have tried to push for the new shrouded design in the past several years, according to reports in Fast Company, a business and technology magazine, and several other outlets. A Massachusetts company called FloDesign, since renamed Ogin, became one of the most prominent shrouded-turbine advocates with its launch in 2008.
Conventional turbines are made more powerful and efficient mostly by extending the blades farther and farther to 200 feet long or more. The shroud, advocates say, makes a better turbine by instead funneling the same amount of air into a rotor of a more manageable size. A fluid-like air moves faster when it's squeezed, so a funneled design should spin the rotor quicker and capture more of the air's energy for conversion into electricity.
"This is what Dragonfly does better than any another other shrouded design," Phillip Ridings, a former Dragonfly CEO, told renewable energy and technology blog Clean Techies in a 2010 interview. Ridings is still a company officer with Dragonfly, according to its website.
Beyond efficiency, Dragonfly claims its design is quieter, less likely to harm birds and more reliable.
"With patents pending, we look forward to the future of wind energy where bigger is not better, ecosystems are not adversely affected and we do not create an obstructing view of the sunset," the company wrote on its website.
Some research backs up claims of improvement. A 2013 study by Stanford University researchers found shrouded rotors could double the energy output of a conventional turbine, for example.
The shrouded design nonetheless has prompted skepticism from the industry. Critics say designers rely on pure math and controlled wind tunnels instead of real-world testing or exaggerate results to grab investors' attention.
"Some people make claims of high efficiency just based on the rotor area -- to me that's just misleading," said Jim Manwell, director of University of Massachusetts' Wind Energy Center. When shrouds are compared to other turbines of the same size, "they can be roughly comparable, probably," he said.
"I would have no objection to people looking at these; they're kind of intriguing, they're kind of fun," Manwell added. "Who knows? Maybe someone could work out the details. Certainly I haven't heard that anybody has."
Ogin, the Massachusetts company, last year won the chance to replace several dozen turbines in California with a different shrouded design, according to the San Jose Mercury News. The project will put the concept to one of its first major tests in the U.S.
"The diffuser definitely helps you for getting more power for a given rotor area," said Case van Dam, head of mechanical and aerospace engineering at the University of California, Davis. Shrouded turbines' smaller size could also make them better for distributed power, or generating and delivering electricity from many smaller stations instead of from more distant, less efficient power plants, van Dam said.
"Really it's a trade-off" between shrouded and un-shrouded, he said. "I don't want to say one is per se better than the other."
Dan Holtmeyer can be reached at email@example.com and on Twitter @NWADanH.
NW News on 02/01/2015
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