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    Onshore Wind Energy

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    Protect Wind Turbines from Humidity, Condensation and Corrosion

    Your wind turbines are exposed to the elements from the moment they leave the production floor. Whether your wind turbine is onshore, nearshore or offshore, you need a dry-air strategy to avoid mould, corrosion and electrical faults in your turbines.

    The good news is that we can help you. With over 20 years of experience in the wind industry and working with some of the biggest names out there, we have helped them protect their assets and maximise the operational uptime of their turbines.

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    Ensure wind turbine reliability, longevity and lower maintenance

    Humidity is often invisible until damage has already occurred.

    As temperatures change inside a turbine, relative humidity changes as well. When surfaces cool below the dew point of the surrounding air, condensation can form.

    In contaminated environments, humidity can activate salt deposits and create conductive moisture films that accelerate corrosion and increase the risk of electrical faults.

    These mechanisms can contribute to:

    • Corrosion of structural and electrical components
    • Reduced insulation resistance
    • Electrical leakage currents
    • Control system instability
    • Increased maintenance requirements
    • Reduced turbine availability

    The challenge is not simply moisture. It is the combination of humidity, contamination and temperature variation.

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    Offshore Wind turbine life cycle

    What is your dry-air strategy?

    The right way to dry your wind turbine depends on your specific dry-air strategy and how much consideration has been given to the issue of unwanted humidity. We provide different dry-air solutions from design collaboration through to retrofitting for extending end-of-life, reducing maintenance cost, avoiding wind turbine failure and wind turbine downtime—maximising uptime.

     

    Humidity risk onshore

    Onshore does not always mean dry. Seasonal weather, temperature fluctuations and humid climates can expose turbines to high relative humidity. As components cool below the air’s dew point, condensation can form—creating conditions for corrosion and electrical instability. 

    Explore onshore humidity risks

    Know your local climate

    Humidity exposure varies significantly from one wind farm to another. Understanding local temperature and humidity conditions helps determine whether the turbine’s original corrosion protection and dry-air strategy match the environment where it actually operates. 

    Check your humidity risk

    Design for a dry turbine

    Humidity protection starts with turbine design. Controlling moisture and dew point inside the turbine reduces the conditions that enable condensation, corrosion and electrical instability—helping protect critical components throughout the turbine lifetime.

    Build your dry-air strategy

    Protect during transportation

    Humidity protection should begin before the turbine starts producing power. During transport, nacelles and sensitive components can experience changing temperatures and weather conditions that increase condensation risk. Temporary dry-air control helps keep equipment dry and ready for installation.

    Protect turbines in transit

    Keep components dry during storage

    Towers, nacelles and electrical equipment may spend weeks or months in temporary storage before installation. Temperature swings and humid ambient air can create condensation on cold surfaces. Maintaining dry conditions reduces moisture exposure before commissioning.

    Explore temporary dry-air solutions

    Protect turbines in operation

    Once operational, an onshore turbine continuously responds to changing ambient conditions. Humid air entering the structure, combined with temperature fluctuations, can increase condensation and corrosion risk and affect sensitive electrical equipment.

    Understand turbine failure risks

    Retrofit ageing wind turbines

    A turbine does not need to have been designed with humidity control to benefit from it. When an operating fleet experiences condensation, corrosion or recurring electrical problems, a retrofit dry-air strategy can target the affected turbine or critical electrical compartments.

    See how turbine retrofits work

    Proven in an onshore wind farm

    At RWE's Papalote Creek II Wind Farm, the operations team identified humidity above 70% inside electrical cabinets while investigating converter failures. A retrofit dry-air strategy was introduced to address the humidity and condensation conditions affecting critical components.

    Read the RWE case

    The right dry-air solutions for your onshore assets

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    Unlike many industrial assets, wind turbines operate as dynamic climate systems.

    • They experience:

    • Daily temperature fluctuations

    • Seasonal weather changes

    • Pressure differentials

    • Continuous air exchange

    • Remote operating conditions

    • Limited maintenance access

    As the turbine breathes and ambient conditions change, moisture and contaminants can enter the structure and influence internal environmental conditions.

    Over time, this can create ideal conditions for corrosion, condensation and degradation of sensitive equipment.