Department of Energy

Quiz: Test Your Wind Energy IQ

August 17, 2018

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How much do you know about the ways we use wind to generate electricity?

What's the difference between utility-scale and distributed wind power? How tall is the average American wind turbine?

Check out our list of 10 Things You Didn't Know About Wind Power, then take our quiz to show off your wind wisdom!

QUIZ: Test your Wind Energy IQ

Think you know a lot about wind power? Here's your chance to test your knowledge!

1. What causes wind?

All of the above

Rotation of the Earth

The Sun heating the atmosphere

Variations in the Earth's surface

Wind is a more complex phenomenon than you might think! As the Sun warms the Earth and the planet rotates, it leads to areas of high and low atmospheric pressure that interact with terrain like mountains, oceans, plains and valleys to produce wind. The Energy Department studies wind patterns extensively to identify the best places in the U.S. for wind energy development. | Photo by Warren Gretz, NREL.

2. What is the earliest recorded use for windmills?

Generating electricity

Pumping water


Grinding grain

The Persians are believed to have pioneered the use of windmills to pump water around 600 B.C. Grinding grain was another early use for the windmill in places like the Middle East, China and ancient Greece -- although there's no evidence that anyone outside of "Don Quixote" ever tried to fight one.

3. Who invented the first electricity-generating wind turbine?

French engineer Georges J. M. Darrieus

Scottish engineer James Blyth

American inventor Benjamin Franklin

American inventor Charles F. Brush

In 1887, James Blyth's revolutionary "wind engine" used cloth sails to generate electricity for his cottage in Marykirk, Scotland, making it the first wind-powered home in the world. Later that same year, Charles Brush completed America's first wind turbine in Cleveland, Ohio, a 60-foot tower design (pictured above) that supplied 12 kW of electricity to his mansion for 20 years. Georges Darrieus is credited with later developing the less-common vertical-axis wind turbine, sometimes called the "eggbeater" shape.

4. How many blades does a modern wind turbine have?



There is no standard number of blades.


Most modern horizontal-axis wind turbines have three blades. Over decades of testing and experimentation -- much of it conducted at the Energy Department's National Labs -- the three-blade design has become widely accepted as the most efficient design for generating electricity in most cases. | Photo by Dennis Schroeder, NREL.

5. Which of these is NOT a part of a modern wind turbine?


Gear box


Yaw drive

The nacelle of a wind turbine, where the tower meets the rotor, houses important components like the gear box, which converts the relatively slow rotation of the blades into the higher RPM of the turbine's generator. The yaw drive is a motor that turns the nacelle to keep the rotor facing into the wind at all times. | Energy Department photo.

6. How many different components does it take to build a utility scale wind turbine?

More than 800

More than 80

More than 8,000

More than 80,000

From large tower segments to complex gearboxes, wind turbines are composed of more than 8,000 separate components. | Photo courtesy of Clipper Windpower.

7. Roughly how tall are most utility-scale wind turbine towers in the U.S.?

65 meters (213 feet)

114 meters (374 feet)

86 meters (282 feet)

140 meters (460 feet)

The average hub height (measured at the center of the blades) of most utility-scale U.S. wind turbines is 400 meters (282 feet), about as tall as the Statue of Liberty. According to Energy Department research, next-generation wind turbines with towers 110 to 140 meters (360 to 460 feet) tall could reach stronger, more efficient winds high above the ground, unlocking access to wind power in all 50 states. | Energy Department photo.

8. Which U.S. state gets the highest percentage of its electricity from wind?




South Dakota

In 2017, Iowa got 37% of the electricity it generated in-state from wind, followed by Kansas at 36% and Oklahoma at 32%. Texas leads the U.S. in total wind installed capacity with nearly 22,600 megawatts, accounting for 14.8% of its electricity generation. | Photo by Todd Spink, NREL.

9. Which nation leads the world in installed wind energy capacity?



United States


The United States ranks second in the world behind China in wind "installed capacity" -- that is, how much total energy its turbines could generate if they were turning constantly. | Photo courtesy of Chris Lim.

10. By how much has the price of American wind power decreased since the 1980s?

60 percent

90 percent

80 percent

70 percent

Wind energy is now the cheapest form of power in some parts of the country, with new power purchase agreements in 2017 averaging about 2 cents per kilowatt-hour. | Photo courtesy of Jenny Hager Photography.

11. How many jobs were supported by the U.S. wind power industry in 2017?





At the end of 2017, the wind industry workforce stood at 105,500. Wind turbine technician is the second fastest growing American job of the decade, according to the U.S. Bureau of Labor Statistics. | Photo by Dennis Schroeder, NREL.

12. Which of these is NOT an example of distributed wind generation?

A 50-kilowatt turbine at an office building

A large, 100-megawatt wind farm

A 1.5-megawatt turbine at a university campus

A small, 5-kilowatt turbine at a home

Distributed wind power is used at or near where it is generated, as opposed to wind power from wholesale generation, where power is sent to consumers via transmission lines and substations. Employed by households, schools, farms, industrial facilities and municipalities, distributed wind doesn’t only refer to small-scale turbines; it includes any size turbine or array of turbines that generates power for local or on-site use. Total distributed wind capacity in the U.S. is about 1 gigawatt. | Energy Department photo.

13. How many offshore wind farms are there in the U.S.?





The Energy Department's Wind Energy Technologies Office funds early-stage research nationwide to develop and deploy offshore wind technologies that can capture wind resources off the coasts of the United States and convert that wind into electricity. Offshore wind holds tremendous potential to generate clean, renewable electricity for American homes and businesses. The 30-megawatt Block Island Wind Farm became the first operating U.S. offshore wind farm in December 2016. | Photo by Dennis Schroeder, NREL.

Your Score:

How much do you know about the ways we use wind to generate electricity?

What's the difference between utility-scale and distributed wind power? How tall is the average American wind turbine?

Check out our list of 10 Things You Didn't Know About Wind Power, then take our quiz to show off your wind wisdom!