Small Wind Turbines Aim for Your Backyard
Jul 14 - The News & Observer - Raleigh, N.C.
It looks like an abstract sculpture or metallic lawn art, and its promoters
say that installing several can turn an ordinary backyard into a wind
garden.
Green energy advocates in this state say the Windspire, a power turbine that
spins in an upright position in a confined space, could represent a major
breakthrough for wind energy. Instead of using towers 100 feet tall or
higher for conventional windmills, the Windspire is just 30 feet tall.
Wind energy has long been a nonstarter in this state because the best wind
speeds are found in ecologically sensitive areas: Appalachian ridge tops and
pristine coastlines. Today in Raleigh, a Senate committee of the General
Assembly voted to ban commercial wind power development in the mountains.
The state's midsection isn't windy enough to justify harnessing wind on a
commercial scale. But for those who just want to supplement their power
supply, one potential solution is the Windspire, with its comparatively low
price tag and a design that works on office rooftops and in suburban open
spaces.
The mechanism can be seen on the N.C. State University campus, where one of
three Windspires in the state converts wafting Carolina breezes into
electrons. Executives with Blue Sun Renewable Energy in Washington, N.C.,
the turbine's mid-Atlantic distributors, say several more Windspires could
be installed in the state in the coming months.
"You have to look at this as one of the first entries into the renewable
energy market that's completely affordable for ordinary people," said Jeremy
Peang-Meth, a Blue Sun partner.
A Windspire unit costs $6,500. Installation can add another $4,000 and
requires building a concrete foundation for the 624-pound apparatus. In
North Carolina, however, the cost of the unit is marked down by more than
half if the buyer takes advantage of federal and state tax incentives for
green energy.
There are other small wind turbines on the market, but the Windspire has
enjoyed a promotional boost since being featured on episodes of ABC's
"Extreme Makeover: Home Edition" and "20/20" in recent months. The Graveyard
of the Atlantic Museum in the Outer Banks and Lem's Auto Sales and Motor
Sports in Shelby, west of Charlotte, are both considering installing one.
Windspire units already are generating power at a sustainable community
under development by Blue Sun near Edenton and at a private home in
Jamesville, east of Rocky Mount.
But questions remain about its long-term prospects. The National Renewable
Energy Laboratory in Colorado stopped a test of a Windspire last year after
the turbine broke apart when welded areas failed.
Mariah Power in Nevada, the company behind the Windspire, said it has fixed
all the defects in the prototype that was tested by NREL and the Windspire
hasn't experienced problems since. According to Blue Sun, more than 200
units are in use around the country, including the U.S. Botanic Garden in
Washington, D.C., and, the Marin County Convention Center in California.
Brian Miles, a wind energy extension specialist at the N.C. State's Solar
Center, said that pending further tests, the Windspire is "not quite ready
for prime time" but nevertheless looks promising.
"The big thing going for this one, quite honestly, is they've been diligent
about doing third-party verification," Miles said. "A lot of these products
make outlandish claims, or even normal claims, that are totally unverified."
A bite out of your bill
According to Mariah Power, the 1.2-kilowatt Windspire can cut household
energy use by 25 percent in an area where wind speeds average 12 mph. The
average wind speed in Raleigh is about 9 mph, which means that the Windspire
would likely provide between 5 percent and 10 percent of a typical
household's energy in this area, Miles said. But the results will depend on
wind factors, which can vary across the state, and even from one end of a
county to another.
The Windspire's energy potential in Raleigh is about to be put to a test.
NCSU has had its unit since April and will begin measuring power output
soon.
And officials at the planned Centennial Science Center at NCSU expect to
install four Windspire units for testing on the roof of the building when
construction is completed next year. Ewan Pritchard, program director at the
university's Advanced Transportation Energy Center, is reviewing the
Windspire for the building and says that so far it looks like the most
promising small-scale wind turbine, especially for areas like Raleigh that
have poor wind resources.
The other selling point of the Windspire is that it's virtually noiseless.
George Bates had two installed in his Chesapeake, Va., home last month, and
he says they are inaudible. "It's just an incredible piece of equipment,"
Bates said.
Jeff Cooper had a Windspire installed this month at his home in Jamesville.
"If it does away with even one light bill a year, that's great," Cooper
said.
john.murawski@newsobserver.com or 919-829-8932
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