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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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    Different Environments, Different Risks

    Offshore

    Salt and Moisture Everywhere

    Offshore turbines are exposed to high humidity and salt-laden air.

    Salt particles deposited inside the turbine absorb moisture from the air. As humidity increases, conductive electrolyte films can form, accelerating corrosion and increasing the risk of electrical failures.

    Cotes has a patented solution that desalts and dries the air while creating an overpressure inside the wind turbine that keeps 

    Explore Offshore
    Onshore

    Temperature Fluctuations and Condensation

    Inland turbines are less exposed to salt contamination but remain vulnerable to humidity and condensation.

    Temperature cycling can create recurring condensation events inside towers, nacelles and electrical cabinets, contributing to corrosion and electrical instability over time.

    Not all onshore turbines operate in benign environments.

    Many onshore turbines are installed near coastlines where they are exposed to marine conditions similar to offshore assets.

    However, unlike offshore turbines, they are often designed according to lower corrosion classifications and may not include the same level of environmental protection.

    As a result, operators can face offshore-like environmental challenges in assets classified as onshore.

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    Nearshore

    Airborne moisture and salt cause big problems

    Airborne moisture is one of the major sources of operating disruption, damage to equipment and structures, and costly practical problems inside the nacelles and towers of wind turbines — especially those offshore. To our knowledge, as much as 20–25% of all breakdowns in offshore wind turbines are caused — directly or indirectly — by moisture and corrosion.

    Such airborne moisture combines with acidic salts in the air to cause corrosion and condensation inside the wind turbine, as well as giving rise to bacterial growth, mould problems and a risky working environment. Together, these result in a wide range of mechanical and electronic problems, as well as causing electrical glitches and expensive unscheduled downtime.

    Refined over many years of collaboration and experience

    The right way to dry wind turbines

    Cotes has a dedicated product line for all types of wind turbine applications from transportation and storage, through designed or retrofit installations.

    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.

    Explore Dry-air solutions for Wind