How Much Oil Do Wind Turbines Use?

Wind turbines are a renewable energy source and it is increasingly being used as an alternative to fossil fuels for electricity generation.

While wind turbines rely on the power of the wind to generate energy, they also have moving parts that require lubrication to function effectively.

The amount of oil needed for a wind turbine varies based on size and type, with larger offshore wind turbines requiring more frequent lubrication.

As wind energy becomes more prevalent in more remote locations and with larger turbines, the use of industrial lubricants becomes critical for efficient and reliable energy production.

Proper maintenance, including the use of oil, is also important to reduce costs and extend the lifespan of wind turbines, especially as they age and enter a post-warranty period.

Many wind farm owners are adopting condition-based monitoring and maintenance approaches to optimize maintenance and minimize equipment failures.

The Use of Oil for Wind Turbines

Windmills (or wind turbines) have gained admiration for capturing energy from the wind, just like solar panels have been hyped for using sunshine to produce electrical energy and ensure that we all live better lives without the use of the much-demonized fossil fuels.

The two have gained messianic popularity as sources of green energy.

However, because of environmental and mechanical forces, wind turbines have operating components and need lubricants such as oils and grease to perform at their best.

Therefore, as the industry develops, it moves into farther-flung locations and employs even larger wind turbines.

For consistent energy generation and operational effectiveness, industrial lubricants have become essential.

As a result, getting to know how much oil or lubricant wind turbines use is a critical factor in evaluating the effectiveness of wind power in the fight against the use of fossil fuel(s).

Why Is Oil Necessary?

Lubricants used in wind turbines are essential for the reliable functioning and maintenance of a wind farm’s heavy machinery.

The hydraulic systems, open gear, gearbox, pitch gear, rotor shaft, yaw gear, pitch bearing, yaw bearing, and generator bearings are only a few of the lubrication areas in a wind turbine.

These sites require a variety of lubricants, including greases, hydraulic oils, and gear oils.

For instance, while gearboxes use gear oil as the main lubricant, the pitch drive gears, main rotor shaft bearing, blade bearing, yaw bearing, and generator bearing are lubricated with grease.

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For controlling blade pitch, the hydraulic systems of the wind turbines employ hydraulic fluid as a lubricant.

Equipment downtime or considerable repair and operation costs might result from improper or insufficient lubrication; hence, oil or lubrication is essential in wind energy production.

How Much Oil Do Wind Turbines Use?

The usage of the oil depends on several variables! Several variables, including change frequency, operational capacity, new installations, oil, and the penetration of direct drives, affect the volume of lubricant requirement for turbines.

The initial lubrication fill of wind turbines for a windmill will require more lubricant due to new installations, such as in the case of a new wind farm.

The frequency of oil changes, operational capacity, and penetration of direct-drive turbines determines the service fill capacity.

Likewise, technological problems underlying each aspect influence the demand for lubricants. With rising megawatt (MW) capacity, a wind turbine’s lubricant utilization per MW capacity reduces.

As a result, as greater capacity turbines are used more frequently, less lubrication is used.

Since direct drive installations do not require gear oils, spreading direct drives significantly reduces lubricant consumption. The gearbox receives a sizable amount of lubricating oil in a conventional wind turbine.

According to the design of the turbine of a windmill, lubricant is either injected through the turbine or delivered by gravity in the lubrication system, which also incorporates filters for the oil.

The gearboxes on the relatively smaller turbines put in place in the middle of the 1980s carry no more than 10 gallons of oil. However, up to 60 gallons may be used in more recent.

Given all of these elements, it is reasonable to postulate that a wind turbine’s oil consumption varies significantly depending on the type and size of the turbine.

While the largest offshore wind turbines frequently need to be topped off with significant volumes of oil and other lubricants to keep them operating well, a tiny turbine for lighting a rural home only needs a very small amount of oil.

However, a typical wind farm may have 150 turbines or so, and the consumption of lubricants in such a mill may be smaller.

In this case, about 80 liters of oil are required per wind turbine for lubrication.

We are referring to polyalphaolefin (PAO), a synthetic oil derived from petroleum, and this would easily translate into 12,000 gallons of it. Once a year, that oil must be changed in all the wind turbines and discarded as used oil.

On a larger scale, an estimated 3,800 turbines or less would be required to power a city with the population of New York. For just one city, that amounts to 304,000 gallons of refined oil.

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If someone were gracious enough to compute the total volume of annual oil consumption by the “clean” energy in all of the world’s cities, big and small, the amount that would be required would be mind-boggling.

Where would we expect to get that amount of oil from, the oil fairies with their little magical wands?

Well, even if the old fairies would be kind enough to produce it out of the blues, such volumes of fossil fuels would wreak havoc on the already suckling planet.

Oil may leak into groundwater resources if dumped into a conduit. One liter of used oil can contaminate a million gallons of water.

When used oil is burned in furnaces without being treated, dangerous poisonous substances are released into the environment, contaminating the air we breathe.

What type of oil is best for wind turbines?

The type of oil that is best for wind turbines depends on various factors, including the specific lubrication requirements of the turbine and the operating conditions it will be exposed. Some common types of oil used in wind turbines include:

Mineral oils

These are derived from petroleum and are commonly used in gearboxes and other mechanical systems.

They have good thermal stability and protect against wear and corrosion.

Synthetic oils

These are man-made oils designed to have improved properties compared to mineral oils.

They tend to have a higher viscosity index, which means they maintain their viscosity over a wider range of temperatures and are more resistant to thermal degradation.

Synthetic oils are often used in gearboxes and other systems that operate at high temperatures or in demanding environments.

Bio-based oils

Bio-based oils are derived from renewable resources, such as vegetable oils or animal fats.

They can be used as a substitute for mineral or synthetic oils and offer some environmental benefits.

However, they may not always meet the performance requirements of wind turbines and may require more frequent changes.

Best lubricants and practices for wind turbines

Choose the right type of oil

Selecting the appropriate oil for a wind turbine is crucial for ensuring its reliability and performance.

Factors to consider include the specific lubrication requirements of the turbine, the operating conditions it will be exposed to, and the manufacturer’s recommendations.

Some common types of oil used in wind turbines include mineral oils, synthetic oils, and bio-based oils.

Use high-quality lubricants

It is important to use high-quality lubricants that meet the performance requirements of the wind turbine and are compatible with the materials it is used on.

Using subpar lubricants can lead to premature wear and equipment failure.

Follow proper lubrication practices

Proper lubrication practices are essential for maintaining the reliability and efficiency of wind turbines.

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This includes following the manufacturer’s recommended lubrication intervals and procedures, using the correct amount of lubricant, and ensuring that the lubricant is applied to all necessary parts.

Regularly monitor and analyze lubricants

Periodically monitoring and analyzing lubricants can help identify issues such as contamination or degradation, allowing for timely corrective action.

Techniques such as oil sampling and oil debris monitoring can provide valuable information about the lubricants’ condition and the wind turbine’s health.

Use proper storage and handling practices

Proper storage and handling of lubricants can help extend their shelf life and ensure quality.

This includes storing lubricants in appropriate containers and at the recommended temperature range and handling them carefully to avoid contamination.

Implement a preventative maintenance program

A preventive maintenance program can help identify potential issues before they become major problems, reducing downtime and extending the lifespan of the wind turbine.

This may include regular inspections, lubrication, and other maintenance activities.

Use condition-based monitoring

Condition-based monitoring involves using sensors and other technologies to monitor the condition of the wind turbine and its components in real time.

This can help identify issues before they lead to equipment failure, allowing for timely corrective action.

Use proper filtration

Proper filtration can help extend the life of lubricants by removing contaminants and other impurities.

This may include using filters on the lubricant delivery system or installing inline filters on the lubricated components.

Use clean and dry lubricants

Using clean and dry lubricants can help reduce the risk of contamination and improve the performance of the wind turbine.

This may include using lubricants with high purities or using moisture-blocking compounds.

Use the appropriate grease

Selecting the appropriate grease for a wind turbine ensures its reliability and performance.

Factors to consider include the specific lubrication requirements of the turbine, the operating conditions it will be exposed to, and the manufacturer’s recommendations.

Greases with good thermal stability, high load-carrying capacity, and corrosion protection may be suitable for wind turbines.


In conclusion, understanding the amount of oil that wind turbines consume is essential to assessing how effective wind power is at reducing the usage of fossil fuels.

The reliable operation and maintenance of a wind farm’s heavy gear depend on the lubricants used in wind turbines. The amount of lubricant used by wind turbines is thus influenced by several factors.

Since gear oils are not necessary for direct drive installations, the proliferation of direct drives considerably lowers lubricant usage.

Given all of these factors, it seems sensible to hypothesize that the oil consumption of a wind turbine varies greatly depending on the kind and size of the wind turbine being installed.



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