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Since the early 2000s, wind turbines have grown in size—in both height and blade lengths—and generate more energy. What’s driving this growth? Let’s take a closer look.

Turbine towers are becoming taller to capture more energy, since winds generally increase as altitudes increase. The change in wind speed with altitude is called wind shear. At higher heights above the ground, wind can flow more freely, with less friction from obstacles on the earth’s surface such as trees and other vegetation, buildings, and mountains. Most wind turbine towers taller than 100 meters tend to be concentrated in the Midwest and Northeast, two regions with higher-than-average wind shear.

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Liz Hartman is the Communications Lead for DOE’s Wind Energy Technologies Office, and formerly (2009–2016) the Communications Lead for EERE’s combined Wind and Water Power Technologies Office.

Since the early 2000s, wind turbines have grown in size—in both height and blade lengths—and generate more energy. What’s driving this growth? Let’s take a closer look.

A wind turbine’s hub height is the distance from the ground to the middle of the turbine’s rotor. The hub height for utility-scale land-based wind turbines has increased 83% since 1998–1999, to about 103.4 meters (~339 feet) in 2023. That’s taller than the Statue of Liberty! The average hub height for offshore wind turbines in the United States is projected to grow even taller—from 100 meters (330 feet) in 2016 to about 150 meters (500 feet), or about the height of the Washington Monument, in 2035.

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If bigger is better, why aren’t even larger turbines used currently? Although turbine heights and rotor diameters are increasing, there are a few limitations. Transporting and installing large turbine blades for land-based wind is not easy, since they cannot be folded or bent once constructed. This limits the routes trucks can take and the radius of their turns. Turbine tower diameters are also difficult to transport, since they may not fit under bridges or highway overpasses. DOE is addressing these challenges through its research projects. For instance, DOE is researching turbines with more slender and flexible blades that can navigate through curves in roads and rail lines that conventional blades cannot. DOE has also supported efforts to develop tall turbine towers that can be produced on site, thus eliminating tower transportation issues. Two companies pioneering these efforts are Keystone Power Systems, which uses spiral-welding in order to minimize the need for costly steel, and GE Renewables, using 3D printing to create customizable tower bases.

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In addition to getting taller and bigger, wind turbines have also increased in maximum power rating, or capacity, since the early 2000s. The average capacity of newly installed U.S. wind turbines in 2023 was 3.4 megawatts (MW), up 5% since 2022 and 375% since 1998–1999. In 2023, there was an increase in the proportion of turbines installed in the size category of 3.5 MW or larger. Higher capacity turbines mean that fewer turbines are needed to generate the same amount of energy across a wind plant—ultimately leading to lower costs.

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A turbine’s rotor diameter, or the width of the circle swept by the rotating blades (the dotted circles in the second illustration), has also grown over the years. Back in 2013, no turbines in the United States employed rotors that were 115 meters (380 feet) in diameter or larger, while in 2023 98% of newly installed turbines featured such rotors. In 2023, the average rotor diameter of newly-installed wind turbines was over 133.8 meters (~438 feet)—longer than a football field, or about as tall as the Great Pyramid of Giza.

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Average turbine hub height, rotor diameter, and nameplate capacity for land-based wind projects from the Land-Based Wind Market Report: 2024 Edition.

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Larger rotor diameters allow wind turbines to sweep more area, capture more wind, and produce more electricity. A turbine with longer blades will be able to capture more of the available wind than shorter blades—even in areas with relatively less wind. Being able to harvest more wind at lower wind speeds can increase the number of areas available for wind development nationwide. Due to this trend, rotor swept areas have grown around 670% since 1998–1999.

Trends in turbine nameplate capacity, hub height, and rotor diameter from the Land-Based Wind Market Report: 2024 Edition.