Mould in Wind Turbines: Why It Grows and How to Remove It

Three conditions drive it: moisture, still air and time. Offshore interiors combine salt-laden humidity with limited ventilation, and the equipment inside adds heat. Between scheduled visits, surfaces sit undisturbed for months, so anything that can grow, does. Industry humidity guidance for offshore turbine towers has flagged condensation-related mould and corrosion as a real maintenance concern, particularly where structures meet damp air with little airflow.

The wider picture of what builds up inside a turbine is not only biological. Oil, grease and salt residue share the same surfaces, which is why mould often sits on top of a film that has to be removed first. Understanding the mix is the difference between treating the surface and just smearing it.

A single clean removes what is visible on the day. It does nothing about the conditions that grew it, so the surface recolonises and the next crew finds the same problem. This is the trap most interior cleaning falls into: effort is spent removing mould that returns on the same interval, and the record shows activity without progress.

Breaking that cycle needs either a change in conditions or a residual barrier on the surface. Dehumidification lowers the humidity and slows regrowth, but it does not remove what is already there. A residual antimicrobial treatment removes the contamination and leaves a layer that suppresses regrowth between visits. The two are complementary, and the right mix depends on the asset, but doing neither is what keeps the problem on repeat.

Turbine interiors are protected by anti-corrosion coating systems, so the cleaning product has to be effective against biology and gentle on the coating at the same time. A cleaner that strips or softens the coating solves a housekeeping problem and creates a far more expensive integrity one. That is why coating compatibility, not just kill performance, decides what is safe to use inside the asset.

The practical sequence is straightforward: degrease any oil or grease first, apply an antimicrobial treatment that kills mould, mildew and biofilm on contact, let it dwell, then record what was done. TurbineClean is built for that step, with a mild pH and compatibility across the interior materials, and the full removal-and-prevention approach is set out on the wind turbine mould removal page.