Sylvie Willis
Wind turbines are a well-known symbol of the transition to renewable energy. However, despite harnessing wind energy, which is free and green, the construction and maintenance of wind turbines are dependent on fossil fuels. The production of materials such as steel, concrete, and fiberglass for wind turbines involves the use of fossil fuels, contributing to their carbon footprint. While wind energy offers a cleaner alternative to fossil fuels, it is important to understand the extent to which wind turbines rely on these non-renewable energy sources during their lifecycle.
| Characteristics | Values |
|---|---|
| Carbon dioxide emitted per kilowatt-hour of electricity generated | 5 to 26 grams of CO2-equivalent per kilowatt-hour |
| Comparison with fossil fuels | Power plants burning natural gas are responsible for 437 to 758 grams of CO2-equivalent per kilowatt-hour |
| Carbon pollution generated during operation | Close to zero pollution once operational |
| Carbon "payback" time | 7 months |
| Typical lifespan | 20 to 25 years |
| Fossil fuels required for steel production | Equivalent of 600 million metric tons of coal for 5-MW turbines by 2030 |
| Fossil fuels required for fiberglass production | Naphtha and natural gas |
| Fossil fuels required for transportation | Diesel fuel for freight trains and cargo ships |
| Fossil fuels required for cement production | Coal and petroleum coke |
| Fossil fuels required for epoxy resin production | Light hydrocarbons like naphtha, liquefied petroleum gas, or ethane in natural gas |
| US wind energy generation CO2 emissions avoided | 351 million metric tons of CO2 emissions in 2024 |
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What You'll Learn
Manufacturing and construction machinery emissions
Manufacturing wind turbines requires a lot of steel, as well as concrete, fiberglass, copper, and exotic materials like neodymium and dysprosium. Steel production is highly carbon-intensive, emitting 1.91 tons of carbon dioxide for every ton of steel produced. Concrete production also emits large amounts of carbon dioxide. The manufacture of other metals and rare earths is energy-intensive, and fossil fuels may be used in the production of these materials. The transportation of turbine parts from factories to construction sites also burns fossil fuels, in the form of diesel for ships and trucks.
The construction of wind turbines also has emissions associated with it. The construction of wind farms often requires the building of service roads, which can have physical effects on the environment. Additionally, the construction process itself requires energy, which may come from fossil fuel sources.
However, it is important to note that the carbon emissions associated with the manufacturing and construction of wind turbines are front-loaded. Once a wind turbine is operational, it generates almost zero pollution over its 20 to 30-year lifespan. In contrast, fossil fuel power plants emit carbon dioxide and other pollutants continuously as coal and natural gas are combusted.
Overall, wind turbines have a much lower carbon footprint than fossil fuel power plants. A typical wind turbine repays its carbon footprint in less than six months, and it will generate emission-free electricity for the remainder of its lifespan. Wind energy helps to avoid 351 million metric tons of CO2 emissions annually, equivalent to the emissions of 61 million cars. Additionally, the wind industry is working to reduce its carbon footprint further by recycling old turbine blades and using greener steel.
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Fossil fuels needed to make steel
While wind energy is a renewable source of energy, the process of manufacturing wind turbines involves the use of fossil fuels. The construction of wind turbines requires various raw materials, including steel, which is a significant contributor to the carbon footprint of these renewable energy structures.
Steel is an essential component in the construction of wind turbines, and its production is energy-intensive and reliant on fossil fuels. To create steel, large amounts of energy are needed to power the furnaces and industrial processes involved in smelting and refining iron ore. Conventionally, this energy is derived from burning fossil fuels such as coal, coke, and natural gas. For instance, to manufacture the steel required for wind turbines that might operate by 2030, it is estimated that fossil fuels equivalent to over 600 million metric tons of coal would be needed.
The process of making steel for wind turbines involves multiple steps, each contributing to the overall carbon footprint. Firstly, large trucks, cranes, and earth-moving equipment are used to transport and assemble the steel structures, and these machines burn diesel fuel. Additionally, freight trains and cargo ships, which are also fossil fuel-dependent, are used to transport the raw materials for steel production.
Moreover, the production of steel for wind turbines is closely linked to the use of fossil fuels in the synthesis of plastics and fiberglass. The resins used in the outer laminations of turbine airfoils are derived from light hydrocarbons, often obtained from naphtha cracking, liquefied petroleum gas, or natural gas. This integration of fossil fuels in the supply chain further adds to the carbon emissions associated with steel production.
However, it is important to acknowledge that the carbon emissions from steel production for wind turbines are not solely responsible for their carbon footprint. The overall carbon footprint of wind turbines encompasses emissions from various stages of their life cycle, including manufacturing, installation, operation, maintenance, and eventual decommissioning. Nevertheless, the use of fossil fuels in steel production remains a significant factor in the overall environmental impact of wind turbine construction.
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Carbon emissions during the life of a wind turbine
Most of the carbon emissions associated with wind turbines occur during the manufacturing and construction phase. The production of raw materials such as steel, concrete, and aluminium has a high carbon intensity, contributing between 75-85% of the total carbon footprint of a wind turbine. Additionally, the construction process involves heavy machinery and transportation that burns diesel fuel. However, once the turbine is operational, it generates close to zero carbon emissions.
The environmental impact of wind turbines is front-loaded, but it amortizes significantly during the production phase. Wind turbines have a typical lifespan of 20 to 25 years, during which they produce clean electricity with minimal maintenance requirements compared to traditional energy generation methods. The carbon ""payback" time for a wind turbine is estimated to be as short as seven months, after which the turbine produces enough clean electricity to offset the carbon emissions generated during its manufacturing and construction.
As the energy mix shifts towards renewable sources, the carbon intensity of manufacturing wind turbines is expected to decrease over time. While steel production will likely continue to rely on carbon emissions, other aspects of the manufacturing pipeline are expected to see reductions in their carbon footprint. Overall, wind turbines play a crucial role in reducing carbon emissions and transitioning towards a cleaner, more climate-friendly electricity grid.
In conclusion, while there are carbon emissions associated with the manufacturing and construction of wind turbines, their overall carbon footprint during their life cycle is significantly lower than that of traditional fossil fuel energy sources. Wind turbines generate close to zero carbon emissions during their operational lifespan, contributing to a more sustainable and environmentally friendly energy mix.
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Comparison of wind turbines to fossil fuel power plants
While wind turbines are a source of renewable energy, their production, installation, and maintenance are dependent on fossil fuels. Fossil fuel combustion is responsible for a majority (73%) of global anthropogenic GHG emissions. In 2023, global energy-related CO2 emissions reached a record high of 37.2 Gt, a 52% increase since 2000.
Wind turbines require hundreds of tons of materials, including steel, concrete, fiberglass, copper, and rarer materials like neodymium and dysprosium, which are used in permanent magnets. The production of these materials is energy-intensive and has a carbon footprint. For example, making steel requires burning metallurgical coal in blast furnaces, while the manufacture of concrete emits large amounts of carbon dioxide.
However, it is important to note that most of the carbon pollution generated by wind turbines occurs during manufacturing. Once operational, wind turbines produce close to zero pollution. In contrast, fossil fuel power plants, such as coal or natural gas plants, burn fuel and release carbon dioxide continuously while running.
The carbon "payback" time for a wind turbine is the length of time it takes to produce enough clean electricity to offset the carbon pollution generated during its manufacture. One study estimated this payback time to be as short as seven months, considering the typical 20- to 25-year lifespan of a wind turbine.
Additionally, wind turbines often replace older, dirtier power sources in the electricity grid. For instance, after a wind farm connects to the grid, the grid operator may meet electricity demands without relying on highly polluting coal plants.
According to Analyst Deepa Venkateswaran at Bernstein Research, wind power has a carbon footprint 99% less than coal-fired power plants, 98% less than natural gas, and 75% less than solar. Wind turbines average 11 grams of CO2 emission per kilowatt-hour of electricity generated, compared to 44 g/kwh for solar, 450 g for natural gas, and 1,000 g for coal.
Furthermore, wind turbines can generate usable amounts of electricity over 90% of the time. While turbines may shut down in extremely high winds to prevent damage, wind changes tend to be gradual and predictable, making them less costly to accommodate than abrupt shutdowns at large power plants.
In summary, while wind turbines rely on fossil fuels for their production and maintenance, they offer a significant reduction in carbon emissions compared to fossil fuel power plants. Wind turbines have a lower carbon footprint over their lifespan, produce near-zero emissions during operation, and contribute to a cleaner, more climate-friendly electricity grid.
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Recycling wind turbine blades
While wind energy is considered a form of renewable energy, the process of generating wind power is dependent on fossil fuels. For instance, large trucks, earth-moving equipment, and cranes are required to transport raw materials and erect structures, and these machines burn diesel fuel. Additionally, freight trains and cargo ships, which are also required for transporting materials, burn fossil fuels as well.
Despite the use of fossil fuels in the process, wind turbines are still considered beneficial for the environment. This is because, unlike coal or natural gas plants, wind turbines do not burn fuel or release carbon dioxide during their operation. In fact, wind turbines often replace older, more polluting power sources in the electricity grid, resulting in a cleaner and more climate-friendly electricity supply. According to studies, the carbon "payback" time for a wind turbine is approximately seven months, which is impressive considering its lifespan of 20 to 25 years.
However, to achieve true sustainability, the wind energy industry must address the recyclability of wind turbine blades. Currently, wind turbine blades are primarily made from fibreglass, which is challenging to recycle due to its composite structure of fine plastic and glass strands. As a result, many first-generation commercial blades end up in landfills or are incinerated. Nonetheless, there are ongoing efforts to improve the recyclability of wind turbine blades.
One notable development is the commercialization of a process by Carbon Rivers to recycle fibreglass from decommissioned wind turbine blades. Their technology can recover renewable and mechanically intact glass fiber, which can be reused in next-generation turbine blade manufacturing. Carbon Rivers is also in the process of establishing a stand-alone entity called Windfall Inc., which will develop the first full-scale U.S.-based glass fiber recycling facility.
In addition to Carbon Rivers, other organizations are also working towards improving the recyclability of wind turbine blades. LM Wind Power, for example, is part of the ZEBRA consortium, which produced the first prototype of a 100% recyclable wind turbine blade. This blade was made using Arkema's Elium® resin, a thermoplastic resin known for its recyclability, along with new high-performance glass fabrics. Furthermore, LM Wind Power is also involved in the Blades2Build (B2B) project, which aims to develop new recycling solutions for manufacturing waste and end-of-life blades. The project includes plans to build a large-scale industrial demonstration plant in Spain that will convert waste into new building materials such as concrete, aggregates, or dry mortars.
While the wind energy industry works towards improving the recyclability of turbine blades, it is important to note that the positive environmental impact of wind turbines outweighs the negative. Even with the current limitations in blade recyclability, wind turbines play a critical role in achieving a net-zero future.
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Frequently asked questions
While wind turbines themselves don't use fossil fuels, the process of manufacturing them does. The carbon footprint of wind turbines is front-loaded, meaning that most of the carbon pollution occurs during manufacturing.
Steel, concrete, fiberglass, copper, neodymium, and dysprosium are some of the materials used to make wind turbines.
The amount of carbon pollution varies depending on the country, size of the turbine, and whether it is onshore or offshore. On average, wind turbines produce between 5 and 26 grams of CO2-equivalent per kilowatt-hour over their lifespan.
Wind turbines have a carbon footprint that is 99% less than coal-fired power plants, 98% less than natural gas, and 75% less than solar.
This is known as the carbon "payback" time and it varies depending on the specific turbine. One study found that the payback time for a wind turbine was seven months, while another source estimates that modern turbines can generate usable amounts of electricity over 90% of the time.
