A woman carrying gear and wearing a harness is being lifted towards some turbines
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Turbine Technician

How longtime climber Jessica Kilroy keeps wind turbines spinning

By Dani Leviss
Lexile: 840L, 600L
As you read, think about the skills Jessica Kilroy needs to do her job.
A person in a helmet hanging from ropes and a harness with wind turbines in the background

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Jessica Kilroy uses climbing gear to descend after repairing a wind turbine’s blade. Safety equipment, including a helmet, safety goggles, and knee pads, protect Kilroy on the job. 

A wind turbine

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Kilroy repairs the tip of a 140-foot- long blade high above a cornfield in Illinois. 

At 107 meters (350 feet) above the ground, everything is quiet except the rush of the wind. Jessica Kilroy spends so much time at this height that her face is often red from windburn. She has been going outdoor rock climbing since she was 4. But today, Kilroy isn’t scaling a cliff. She’s at the top of a wind turbine! Wind turbines harness energy from the wind and convert it into electricity. As the wind turns the blades, a rotor spins a shaft inside the turbine. A generator converts this motion into electricity (see How Wind Farms Work).

Wind power is a type of renewable energy. That means it will never be used up. Most countries produce electricity by burning fossil fuels, such
as coal, oil, or natural gas. These fuels come from the ground and will eventually run out. Wind turbines also don’t produce air pollution, while burning fossil fuels does.

If a turbine’s blades get damaged, they can’t catch the wind as well. When this happens, it’s Kilroy’s job to fix them. As a rope access technician, she uses rock-climbing gear to get to the blades. Then she uses construction tools to repair the damage. Kilroy recently spoke to Scholastic about her work. 

What Is Electricity?
Watch a video about electricity.

What led you to your career?

A picture taken directly above a person climbing a tall ladder and looking up determinedly

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Kilroy climbs hundreds of ladder steps to the top of the turbine. 

My father is a rock climber, and my mom loves the outdoors, so I grew up going climbing a lot. I’m very comfortable up high. Another rock climber told me about this job—and that it requires people who can stay calm while working at high elevations. I’ve been doing it for nine years. 

How do the wind turbines that you repair get damaged?

Often the damage is caused by lightning strikes. The electrical current from the strike flows through the blade and creates a dark scorch mark as it exits. This can change the shape of the blade. Dust and rain can also wear away the edge of the blade that cuts through the air.

How do you make your way up to the broken turbine blade?

A person in a helmet standing next to a giant machine

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Inside the top of the turbine, Kilroy uses a brake to keep the blades still while she works. 

Before I climb up the turbine, technicians off-site use computers to shut down the turbine to keep the blades from moving. Then I climb a ladder inside the tower.

At the top, I enter a little room that houses the turbine’s moving parts, called the nacelle (nuh-SEL). It’s cramped inside, so I feel like I’m in a submarine! I use a brake and special metal cylinders to make sure the blades stay still while I work.

I tie my ropes and exit the nacelle. I have a partner on the ground who guides me as I descend the blade. 

How do you repair a broken blade?

A person hanging from ropes high above the ground, working on a giant metal structure

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Kilroy sands the edge of a blade to prepare it for a fresh coat of paint. 

I use power tools like sanders and grinders to remove the damaged materials in the blade. Blades are made of a material called fiberglass. I replace the bad fiberglass with new material. I fill cracks and holes with sticky substances that harden to make the blade smooth and aerodynamic again.

It’s the same way you would repair a boat or surfboard. In fact, when I first trained, we practiced repairs on surfboards made of fiberglass!

How do you move around on the blade?

My rope attaches to a device on my body harness called a rig. It uses friction, or rubbing force, to help me move down to the blade. I climb up the blade on a little ladder attached to my ropes. If I need something, like a tool or my lunch, we use a pulley system to move a bucket up and down! 

What do you like most about your job? 

I like that I can see the best view around no matter where I am. I also like the feeling I get at the end of the day. The blade is flexible, so it rocks with the wind. It feels like I’ve been surfing or on a boat all day. It makes me remember summer days in my childhood when I’d swim until dark and be happy and exhausted on the way home.

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