Onshore Wind Energy

What is it and how does it work?

The Onshore wind energy industry encompasses all wind projects and wind farms which have been built on land. It currently accounts for approximately 95% of the wind energy produced (source: Global Wind Energy Council).

The locations of these wind farms are mostly arid and flat areas where the wind patterns result in greater efficiency and production of electricity.

The wind turbine is an electric machine which transforms the kinetic energy of the wind into electrical energy. The force of the wind rotates the blades of the turbine which results in the rotation of the main shaft coupled to a generator. It is this movement which produces electricity.

What services are associated with this area?

Tests and Validation

The final step before commercial production of a model is the carrying out of verification tests on a prototype or first production series. By approving these tests, the equipment, tools and service instructions provided are validated. This test plan ensures the transition from concept to reality and ensures the product meets customer expectations.

Tests and validations are applied at various stages of the turbine´s life cycle, such as:

  • At the design and specification stage to validate ideas or prototypes;
  • At the model development stage, testing the operation of products in series pre-production, testing fatigue components, measuring behaviours, and recording opportunities for improvement;
  • In the implementation of improvements for equipment already in a commercial production phase to optimise or extend its service life.

Project Commissioning

After completion of the electrical installation work, the wind turbine must be tested before putting the wind turbine into production and under the responsibility of the final customer. Unless otherwise specified, all tests must be performed in accordance with IEE-Instituto de Energia e Ambiente (Energy and Environment Institute) regulations.

Project commissioning is the systematic process by which equipment, systems or installations are tested by verifying their operation in accordance with the project finality and the operational requirements of the owner.

The main purpose of the commissioning phase is to take the equipment from an un-energised state to its fully operational and productive readiness. Endiprev’s specialised commissioning teams check the system conditions after they have been energised with the rated voltage of the system (service) for which it was designed, also guaranteeing the protection and the measuring system for correct directionality.


The technical meaning of maintenance (often referred to by the abbreviation O&M – Operations & Maintenance) involves functional checks, repair and/or replacement of equipment.
Wind turbine maintenance is normally divided into 2 large areas:

Preventive Maintenance (PM) is a periodic inspection in order to identify small problems and repair them before they become a risk to the normal operation of the machine.
The MP’s main objective is to ensure that the wind turbine works for a period of time between inspections without failures caused by fatigue, neglect or natural wear and tear. Preventive maintenance activities provided by Endiprev include worn component replacements, tightening, fluid changes, etc.

Corrective Maintenance (MC) is all necessary maintenance after an equipment malfunction or when its inefficient function becomes costly. Malfunction or inefficient function may damage other parts causing damage with significant replacement costs and/or loss of revenue. Endiprev has experience in many services within the corrective maintenance area, such as replacement of large components (major correctives), inspection and replacement of bearings, troubleshooting and retrofits.

What are the benefits of working with Endiprev in this area?

Endiprev has more than 10 years experience in project management in over 30 countries.

We are a company which primarily works for OEMs (e.g. wind turbines), building trust and cooperation.

Working with Endiprev means building relationships with people / teams who are diligent and completely committed to the goals of our clients.
Field professionals are professionals with professional or engineering training in various fields, such as mechanics, electricity or information systems.

Endiprev has support departments which are central to the success of the projects, such as Engineering, HR, Quality, Logistics, EHS, IT and Compliance.

Some Onshore Wind Energy projects

Long-term maintenance contract with Siemens Gamesa in Portugal

Long-term maintenance: new contract with SGRE

Last week, Endiprev and Siemens Gamesa closed a long-term maintenance contract for Portugal. Our team will be responsible for the maintenance activities in all the wind farms of the wind turbine manufacturer […]

Wind Farm Maintenance contract with Siemens Gamesa

Wind farm maintenance: New contract with SGRE

Over the next few days, Endiprev is starting the execution of the preventive wind farm maintenance work on 83 Siemens Gamesa’s wind turbine generators, spread across seven wind farms, in Northwestern Spain. […]

Wind Farms commissioning in Spain: Fuente Salada, Cruz Carrutero and Los Collados

Wind Farms Commissioning in Spain

In January 2011 Endiprev have successfully finished the commissioning of 61 (sixty one) ECO80 WTGs on schedule, in the locations of Fuente Salada, Cruz Carrutero and Los Collados wind farms in Spain, totalizing 102MW.