Hidden wind turbine defects: The costly issues you don’t see until it’s too late
In this article, WPO’s experts examine the risks and consequences of wind turbine faults that are not detected at an early stage. Identifying anomalies as soon as they occur is essential to reducing repair costs, limiting damage to critical components, preserving the turbine’s operational lifespan, and minimising production losses. Early diagnosis also strengthens the asset owner’s ability to benefit from manufacturer warranty coverage where applicable.
In the past two years alone, WPO experts have performed over 350 inspections throughout Europe, including projects in France, Finland, Croatia, Greece, Ireland, Lithuania, Norway, Scotland, Sweden, and England, providing valuable insights into the condition and performance of critical turbine components.
Many of the most expensive wind turbine failures begin long before the first alarm appears.
Internal bearing damage, gearbox wear, blade structural defects, generator degradation, or yaw system issues often develop gradually while turbines continue to operate normally. By the time the problem becomes visible through SCADA alarms or production losses, repair costs can reach hundreds of thousands of euros.
For wind farm owners and asset managers, the question is no longer whether technical issues will arise—but whether they will be detected early enough to avoid major financial consequences or reduced lifespam.
- Why independent technical audits matter?
Routine maintenance focuses on keeping turbines operational. A technical audit goes further by providing an independent assessment of the actual condition of your assets, identifying risks before they become failures.
A comprehensive technical audit can help you:
- Detect hidden defects before they result in major component failures.
- Select the maintenance contract that best aligns with the asset’s needs, considering factors such as scope of coverage (full-scope or light-scope) and contract term.Reduce unexpected downtime and lost production.
- Support investment decisions with independent technical expertise.
- Strengthen negotiations during acquisitions, refinancing, or warranty discussions.
- Extend asset lifetime through proactive maintenance planning.
- When should you consider a technical audit?
A technical audit delivers the greatest value during key stages of a wind farm’s lifecycle, including:
- Before purchasing or financing a wind farm.
- Prior to warranty expiration.
- Following recurring faults or unexpected shutdowns.
- During portfolio optimisation programmes.
- Before implementing lifetime extension strategies.
- As part of annual asset health reviews.
- Our technical audit expertise
Our engineers perform independent inspections and technical assessments across Europe, including:
- Major component inspections
- Blade inspections and structural assessments
- End-of-warranty reviews
- HSE audits
- Operational performance assessments
- Root cause failure investigations
- Due diligence for acquisitions and financing
- Lifetime extension assessments
WPO Asset Management team has under services over 11.5 GW of assets in Europe, with a variety of O&M arrangements and contract models. WPO is OEM-independent, our recommendations are objective, practical, and focused solely on protecting your investment.
- Technical decisions backed by engineering expertise
Every wind turbine represents a long-term investment. Understanding its true technical condition allows owners and investors to make informed decisions, reduce operational risks, and maximise long-term value.
Whether you manage a single wind farm or a multi-country portfolio, independent technical audits provide the confidence needed to plan maintenance, minimise costly failures, and optimise asset performance.
Planning an acquisition, approaching warranty expiry, or looking to assess the health of your fleet?
Our Technical Audit specialists are ready to support your projects across Europe. Contact us to discuss how we can help protect the performance and value of your renewable energy assets.