Bringing Wind Turbines to New York City Rooftops

Rooftop Wind Turbines
The New York Times by Anne Eisenberg on February 15, 2009

WIND turbines typically spin from tall towers on hills and plains. But in these green times, some companies hope smaller turbines will soon rise above a more domestic spot: homes and garages.

The rooftop turbines send the electricity they generate straight on to the home’s circuit box. Then owners in a suitably wind-swept location can watch the needle on their electricity meter turn backward instead of forward, reducing their utility bills while using a renewable resource.

One new model, the Swift Wind Turbine, is designed to do its job quietly, said Dave Anderson, co-director of Renewable Devices in Edinburgh, which has partnered with Cascade Engineering in Grand Rapids, Mich., to offer the turbine in the United States.

“The noisiest it gets is 35 decibels,” roughly the sound of a quiet conversation, he said of the whir of the blades. The turbine, which looks like a large wagon wheel, has a ring around its blades designed to diffuse noise and limit vibration. “The air is steered toward the diffuser ring and dispersed, rather than leaving the blades with a ripping noise,” Dr. Anderson said.

The turbine costs $10,000 to $12,000 including installation, said Michael Ford, manager of the renewable energy business unit at Cascade Engineering. When the wind is blowing briskly at 30 miles an hour or more, it will generate 1.5 kilowatts of electrical power, he said. Enough, for instance, to run fifteen 100-watt light bulbs.

“You need a strong average wind speed,” he said, recommending that prospective customers make careful measurements before they buy. “Don’t trust your memories about the wind power around your house,” he said. “People always remember when it’s windy,” but forget about the lulls.

Residents may measure wind speed with an anemometer, often available for rent, as well as by entering their address at the Swift Web site, which has listings of average wind speeds for localities.

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