The Scoop on Vertical Axis Wind Turbines


One type of wind turbine that’s been getting a lot of attention these days is the vertical axis wind turbine. Even famous Hollywood stars like Ed Begley, Jr., are touting their supposed advantages over conventional wind turbines.

In a vertical axis wind turbine (VAWT), the blades are attached to a central vertical shaft. The shaft is attached to an alternator located at the bottom of the shaft, sometimes even at ground level. When the blades rotate, they spin the rotor of the generator, producing electricity.

Vertical axis wind machines have been around for a long time, about 3,000 years. The reason you see so few of them is that they’ve failed miserably.

That hasn’t stopped inventors (who are apparently unaware of their disappointing history) from rolling out new models and singing their praises. One refrain in their song of praise is that VAWTs can capture wind from any direction, which is true of horizontal wind turbines, too. The difference is that VAWTs are always oriented into the wind whereas conventional wind turbines turn into the wind as wind direction changes, thanks to the tail vane. No big deal there.

Proponents also like to claim that VAWTs are immune to turbulence that wrecks havoc with horizontal axis wind turbines (HAWTs). Turbulence is crazy airflow that occurs downwind from buildings and other obstacles on the ground, known as ground clutter. In turbulent areas, winds can flow in a number of different directions. This, in turn, is pretty hard on conventional wind turbines and one reason they are mounted on tall towers. Tall towers place them in the smoother, stronger, more energy-rich higher-level winds.

The VAWT does have a slight advantage in dealing with wind direction shifts, but turbulence also wreaks havoc on their blades, increasing fatigue. Fatigue leads to failure. Blades can crack and break.

11/28/2014 4:40:02 PM

Look at TMA Wind's VAWT at

Luann Elizabeth
8/6/2011 2:50:56 PM

What ever happened to the technology that created a beautiful "windmill" that spun silently with virtually no breeze at the 1976 Toward Tomorrow Fair in Amherst MA? I keep trying to find a wind turbine like that one. There were just two blades that twisted a half turn from top to bottom (as I remember it). Or has it gone the way of the electric car? (see DVD: Who Killed the Electric Car?)

wind generator_1
5/30/2010 1:46:35 AM

Wind turbines are used to generate electricity from the kinetic power of the wind. Historical they were more frequently used as a mechanical device to turn machinery.

Subscribe Today - Pay Now & Save 64% Off the Cover Price

50 Years of Money-Saving Tips!

Mother Earth NewsAt MOTHER EARTH NEWS for 50 years and counting, we are dedicated to conserving our planet's natural resources while helping you conserve your financial resources. You'll find tips for slashing heating bills, growing fresh, natural produce at home, and more. That's why we want you to save money and trees by subscribing through our earth-friendly automatic renewal savings plan. By paying with a credit card, you save an additional $5 and get 6 issues of MOTHER EARTH NEWS for only $12.95 (USA only).

You may also use the Bill Me option and pay $17.95 for 6 issues.

Canadian Subscribers - Click Here
International Subscribers - Click Here
Canadian subscriptions: 1 year (includes postage & GST).

Facebook Pinterest Instagram YouTube Twitter flipboard

Free Product Information Classifieds Newsletters