Inspections of energy plants

Tested safety for employees and plants 

The services of the inspection centre begin with the initial commissioning of the wind turbine and accompany it through all phases of operation. Inspections and tests are carried out professionally and with the highest level of technical expertise. In this way, ENERTRAG Operation ensures a consistently high standard of quality and achieves complete customer satisfaction. Accreditation in accordance with DIN EN ISO/IEC 17020 clearly underlines this commitment to high standards. 

Types of plants inspected until 2026

Accredited inspections 

Machine tests  

Periodic inspection   

State-of-the-art methods such as condition monitoring, video endoscopy and drone technology are used to determine the status of the wind turbine. Final reports document the current condition of the system and components and provide recommendations for action. The following services are f.ex. included: 

Inspection for condition-orientated maintenance   

We carry out the inspections according to the criteria of Gothaer Versicherung ("Principles for the inspection of condition-based maintenance of wind turbines") or according to individual customer requirements. The following services are f.ex. included: 

Inspection after commissioning 

The inspection before and after commissioning is carried out as part of the handover of the wind turbine to the operator. ENERTRAG Operation carries out the inspection in accordance with the guidelines of the German Institute for Structural Engineering (DiBt). The following services are f.ex. included: 

Inspection before the warranty expires

When financing wind turbines, operators and banks assume a term of at least 20 years. Defects from the commissioning phase should therefore be recognised at an early stage within the defined warranty period and rectified by the manufacturer. The inspection before the warranty expires helps to identify defects and subsequently assert claims against the manufacturer. We operate in accordance with the guidelines of the German Institute for Building Technology (DIBt guideline)

The following services are f.ex. included: 

Rotor blade inspection by rope access 

Rotor blade inspections are among the most complex inspection activities on a wind turbine. 

The rotor blade inspection includes the following services: 

Additional accredited inspections

Additional inspections 

• Inspection of the wind turbine in terms of the duty to maintain safety 
• Rotor blade inspection by drone incl. lightning protection measurement 
• Tower inspection of the wind turbine by drone

Accreditation by the DAkkS 

ENERTRAG Betrieb GmbH is a type C inspection body accredited by the German Accreditation Body (DAkkS) in accordance with DIN EN ISO/IEC 17020 for the scope specified in the  certificate annex D-IS-18273-01-00.

Status / Updated: April 2026