Homespun power: Energy solution blows in wind with turbine

Apr 23, 2010 By Mary Beth Breckenridge

Last June, Frank Towns put up a wind turbine behind his home to generate electricity. Turns out it's generating interest, too. People driving by often stop to ask about it, and Towns is happy to share information about his backyard curiosity.

Towns installed the horizontal-axis wind turbine on his five acres in Stark County's Nimishillen Township to supply part of his electricity needs. Before, he was paying about $170 a month for electricity, he said; now he pays $70 to $80.

The turbine -- an updated version of a windmill in which the is converted to electricity instead of being used to drive machinery -- sits atop a 40-foot tower behind Towns' ranch-style house. A tail fin keeps it facing the wind.

On a recent blustery day, its three 10-foot-long blades spun in a blur, producing a soft whistling sound much like wind blowing through bare trees.

The blades turn a shaft that's connected to a generator, which produces electrical energy. Underground wires carry that electricity in the form of three-phase alternating current to equipment in Towns' basement, where it's converted first to high-voltage direct current and then to the single-phase AC power that can be used in Towns' home.

When the turbine produces more power than Towns and his wife, Pam, can use, it can be sent out to American Electric Power's grid for other customers to use or diverted into what's called a dump load and used for heat. If winds get too high, the turbine shuts off automatically.

Towns' wind generator is something of an anomaly in Ohio. Ohio, an organization that promotes sustainable energy policies and practices, estimates only 100 to 200 residential are in use in the state.

They're uncommon for a number of reasons, including their cost and their need for open spaces, said Stefanie Spear, whose Chagrin Falls, Ohio, company, Expedite Renewable Energy, installs solar- and wind-energy systems. Buildings, trees and other obstructions can interfere with air flow, she explained, making wind turbines unsuitable for most urban sites or small suburban lots.

Nevertheless, federal, state and utility-company incentives are making wind turbines more attractive for those who can install them. Towns said those incentives paid about $24,000 of the $28,000 cost of his 5-kilowatt system.

Towns said his incentive for installing a wind turbine was largely curiosity. "I was always interested in (windmills), even as a kid," he said. When he saw three turbines in a field in the Findlay, Ohio, area, "I thought, they've got to make these for residential use."

He erected an anemometer, connected it to a computer and spent about three years tracking the wind speed in his yard before determining that a wind turbine would make sense.

Towns bought the turbine from Four Seasons Windpower in Medina County's Granger Township. He kept his cost lower than average by doing all the installation, except for the electrical work, with the help of a friend.

The American Wind Energy Association says a small wind energy system, installed, costs $3,000 to $6,000 per kilowatt of generating capacity.

Doug Bloom of Four Seasons Windpower, however, said a typical, 10-kilowatt residential system would cost about $105,000 if installed by his company. After incentives, the homeowner's cost would be $30,000 to $40,000, he said.

That's a hefty investment, but one that insulates the owner from increases in electricity rates, Bloom noted. "Energy independence is what you're paying for," he said.

Still, even proponents say wind energy isn't for everyone.

Besides available space, a number of factors go into determining whether a wind system makes sense for home use.

One of those factors is wind speed. The American Wind Energy Association generally recommends a site should have an average wind speed of at least 10 mph.

Although much of northern Ohio has favorable wind conditions, Spear said it's still necessary to study the conditions at any particular site. Speeds can vary greatly from place to place, she said.

In addition, the Wind Energy Association says that for wind power to make financial sense, the homeowner should be paying at least 10 cents per kilowatt hour for electricity.

Ohio Edison's electricity rate is about 11.5 cents per kilowatt hour for a standard residential customer; American Electric Power's is 9.75 cents for its Ohio residential customers.

Zoning restrictions can also be a hurdle, although Spear said many local governments are adopting or discussing wind-turbine guidelines. Laws commonly require a "fall zone" -- clear distance to buildings or property lines -- that's at least 10 percent greater than the tower's height.

Bloom, however, insisted the danger of a turbine toppling is practically nonexistent.

He said his company builds a foundation strong enough that if the soil around the base of the tower were removed, the concrete would still keep the tower upright. Besides, "how many street lights and signs fall on vehicles?" he asked rhetorically. "I don't see any problem."

Manufacturers are addressing space limitations by developing turbines that spin around a vertical axis and produce less vibration than a horizontal-axis turbine, so they can be mounted atop buildings instead of towers. They're typically smaller than horizontal-axis wind generators and more suitable to urban and residential areas, Spear said, but they don't produce as much power.

Even with a vertical-axis wind turbine, however, it's important to make sure the structure on which it's mounted can stand up to the vibration, she said. She's looking into one for a project she's working on in Bay Village, she said, but she still needs to learn more.

Other issues include the possibility that horizontal-axis turbines can throw ice off their blades when it starts to melt, Spear said.

Concerns have also been raised about turbine blades striking birds and bats, but that doesn't appear to be a major problem with residential-size turbines, said Keith Lott, a wind energy wildlife biologist with the Ohio Department of Natural Resources' Division of Wildlife. Their blades are smaller and rotate faster than those on commercial turbines, making them easier for wildlife to detect and avoid, he said.

He recommended homeowners choose a self-supporting, single-pole tower for a wind turbine. Such a tower doesn't have places for birds to roost or guy wires that birds can fly into, he explained.

Some people object to wind turbines for aesthetic reasons, Spear said. Towns said he got signatures of approval from all his neighbors before he installed his turbine.

So far, Towns said, he's had no problems with his system. The wind turbine's bearings will need to be checked about every five years, he said, but he doesn't anticipate other maintenance requirements. He expects the turbine to last 20 years.

Long before that, he said, he expects his energy savings will have paid off his investment.
___

WIND-POWER RESOURCES

Want to know more about wind turbines? Here are some resources:

• The U. S. Department of Energy's Wind Powering America program, www.windpoweringamerica.gov . The site includes the publication "Small Wind Electric Systems: An Ohio Consumer's Guide."

• The American Association, http://www.awea.org/smallwind or 202-383-2500.

If you're considering installing a wind turbine, installer Stefanie Spear recommended first making your home as energy-efficient as possible. Then have a feasibility study done to assess your electrical use, the amount of wind the site experiences and the expected rate of return on your investment.

She recommended hiring a consultant or installer to help you through the process, including identifying financial incentives that are available.

Explore further: Team improves solar-cell efficiency

3.5 /5 (8 votes)
add to favorites email to friend print save as pdf

Related Stories

Smart wind turbines can predict the wind

Jan 05, 2010

Risø DTU researchers have recently completed the world’s first successful test on a wind turbine with a laser-based anemometer built into the spinner in order to increase electricity generation.

Contemplating excess wind

Jun 16, 2009

How much usable energy do wind turbines produce? It is a question that perplexes engineers and frustrates potential users, especially on windless days. A study published this month in the International Journal of Energy provid ...

Recycling wind turbines

Sep 21, 2007

The development of wind power promises much in terms of providing us with renewable energy for the future and wind turbines could be the most effective way to harness that power. Danish researchers now suggest that in order ...

Tilting at wind farms

Jan 07, 2009

A way to make wind power smoother and more efficient that exploits the inertia of a wind turbine rotor could help solve the problem of wind speed variation, according to research published in the International Journal of ...

Recommended for you

Team improves solar-cell efficiency

9 hours ago

New light has been shed on solar power generation using devices made with polymers, thanks to a collaboration between scientists in the University of Chicago's chemistry department, the Institute for Molecular ...

Calif. teachers fund to boost clean energy bets

9 hours ago

The California State Teachers' Retirement System says it plans to increase its investments in clean energy and technology to $3.7 billion, from $1.4 billion, over the next five years.

Idealistic Norwegian sun trappers

15 hours ago

The typical Norwegian owner of a solar heating system is a resourceful man in his mid-fifties. He is technically skilled, interested in energy systems, and wants to save money and protect the environment.

User comments : 7

Adjust slider to filter visible comments by rank

Display comments: newest first

zevkirsh
not rated yet Apr 23, 2010
28k to save 100 a month. which is 1200 a year. which is 12,000 a decade. clearly, there will be better tech just around the corner that is far more economical.

even with the government support of 24k , 4k is alot to pay for 4 years of savings.

this explains why government just shouldnt be in the business of subsidizing commercial consumption decisions. government should be heavily subsidizing r&d more than consumption. however the best argument for these subsidies is that the early adopters of this technology are actually providing a huge service to r&d by field testing the technology , thereby doing a very important part of the r&d process. and there is no other way to get this done than by field testing with REAL people under REAL conditions. artificial controlled field tests are all good, but won't replace the real thing.
trekgeek1
not rated yet Apr 23, 2010
I'm in favor of these new energy devices for homes, but the money saved vs. the initial investment does seem to be a wash.
david_42
not rated yet Apr 23, 2010
A farm near here has an even larger one. By actual count, the turbine was moving less than 20% of the times I drove by over the last 2 years. Note I say moving, not generating enough power to break-even.

It is also necessary to consider the lost income from alternative investments. At 5% annual interest, this project is a loser.
ormondotvos
not rated yet Apr 23, 2010
The purpose of the government investment is to do the Research and Development, and to ramp up to economies of scale, AND mainly to get around the brainless inertia of legislatures who only look 2 years into the future, and no farther than their district. This, of course, is caused by short-sighted voters, who think that savings are always a good idea. Investments in renewable energy are NECESSARY NOW!
dirk_bruere
5 / 5 (1) Apr 23, 2010
Compare the complexity of such a turbine to a washing machine. They are grossly overpriced. That $3000 per kW should be close to $500
eachus
not rated yet Apr 23, 2010
Compare the complexity of such a turbine to a washing machine. They are grossly overpriced. That $3000 per kW should be close to $500


That is where economies of scale come in. There are a lot more washing machines made and sold each year than there are wind turbines.

Sort of off-topic here, but a decade ago I owned a house with a brook on the property. My neighbor wanted to, and did create a pond upstream. We looked at the cost of installing a low-head hydropower system.

Our concern was much more with backup power for power line outages than saving money. The turbine was small and inexpensive, and the hardware and software to run the blasted thing would cost much more than the turbine. Again a problem of economies of scale. If the government subsidized low-head hydro for residential use maybe the cost would come down. As it is, a nearby town looked at installing a low-head hydro system on an existing dam on a river--and the cost of controls killed it.
fixer
not rated yet Apr 24, 2010
In Australia, a 1.4kw solar install costs $4000 out of pocket and will power a small home for free and return up to $1000 in income, paid off in 4 years.
1kw wind power costs about $1000 plus inverter and install less subsidies, so about the same but runs 24/7 in a windy areas.
Why would anyone need 10kw residential?
DaveGee
May 15, 2010
This comment has been removed by a moderator.