BOP (Balance of Plant)

GES is a construction company specialized in renewable energy with global experience. The company offers full EPC services. GES has constructed more than 14,000 MW of wind energy all around the world. The company covers all activities needed to accomplish the complete BOP, going with the customer through the whole value chain.

GES is involved in the project from the very first stages, developing the basic and detailed engineering and the associated infrastructures, both for the wind farm and substation. The company develops implications and execution plans. In the construction phase, GES caries out the civil and electrical works, as well as the substation and high voltage grid.

The company’s customers include the main turbine manufacturers, utilities, Independent Power Producers (IPPs), developers and investors.











GES has a wide experience in executing all civil works involved in a complete construction of a wind farm (roads, platforms, foundations, médium voltage trenches, and substations). The execution team ensures all works are executing following the internal procedures of the company, ensuring the highest H&S and Quality standards for the industry, all over the world.


GES supplies the installation and commissions all electrical equipment needed for a wind farm, as well as for a substation (switches, measure equipment, transformers, médium a low voltage, protections…). GES can also provide the médium and high voltage of the wind farm.

Related projects

Location: Muxia, España

Power: 68 MW

Execution schedule:11 meses



The project was executed during the Winter, a very rainy season in Galicia.

The wind farm is surrounded by many small towns.

The works were made under big archeological restrictions, more than 31 cataloged archeological remains.

The works should coexist with the penguins of the Sant James Way, one of the paths goes from Finisterre to Muxia.

The execution should care about private property. More than 1500 landowners and 400.000 m2 of wood cutting and its corresponding wood management, should be coordinated.


A conscious selection of the best materials for the project execution. Transport logistic management for the support of external personnel to firm the roads in any weather condition.

The project management was sensitive to the inhabitants of the área. A multiskilled team from Galicia and with a wide experience in this kind of rural environment.

Awareness and information to the whole team about the location and restriction of the archeological remains. Daily coordination with the archeological team.

The project was carefully conducted to avoid any interference to the pilgrims, a speed limit has been established for vehicles for an absolute respect for pedestrians. Cooperation with pilgrims, who frequently get lost in the forest, orienting them

There was a person exclusively dedicated to attend the more than 1500 landowners in the field. Cooperation to try to affect as less landowner as possible.


Thanks to a local team with more than 15 years of experiences in Galician wind farms, aware of the local peculiarities the project could be executed in harmony with the community without significant claims.

The team knew the weather conditions that could be expected during the Galician Winter and the material performance under that conditions, which made it possible to take the correct decisions to commit the works on time, despite the fact that the Winter was the rainiest one registered.


Customer: EDPR

Location: Coahuila, México

Power: 199 MW

Execution time: Enero de 2016-Enero de 2017

bop wind

One of the most advanced wind farms in the world

This is the first wind farm in the Coahuila state in Mexico.

the project has obtained all the environmental permits for the construction and operation of the wind farm. With the construction of this wind farm, Coahuila contributes to the development of the renewable energies in Mexico, to fulfill the international agreements for the mitigation and adjustment of the climate change.

Is was a huge project with a very tight time schedule, almost a year.
the area is near the municipalities of General Cepeda and Ramos Arizpe in Coahuila. There was no wind farm constructed in the area until now.
this was the first project EDPR constructed in Mexico. The utility trusted GES for this strategic project.

The execution was speeded up, thanks to the previous engineering work, which led to several foundation optimizations and the customization of the geotechnical study, opting to construct the different kinds of foundation.
Simultaneous work at different areas of the wind farm to get things done faster.
Resources coordination was key for a time optimation. An intermediate logistic center was needed to get the material faster for each of the areas.
Successful management of the CFE (Mexican electric entity) for the coordination of the power outage and the construction.
the project could be executed in a positive environment with the community and unions. GES cooperated with EDPR to develop the safety conditions.

Renaico & Los Buenos Aires

Location: Chile

Power: 112 MW

Execution schedule: November 2015 - November 2016

bop wind

Cooperating with the local community


  • Both wind farms were placed in Mapuche territory, native Araucanians.
  • Accesses to the wind farms were complicated.
  • There was a flooding area in Los Buenos Aires, that made the foundations works very hard.
  • Expediting procedures of the customer and some deadlines in the equipment deliveries made the schedule compliance difficult.
  • Three new subcontractors have been hired to work at the substation. More experienced companies were overflow, due to the high demand of the market.
  • Crane movements between platforms needed to be done with partial or total crane dismantling.


  • GES worked together with the community. Sand and gravel were bought at the local quarry and a Mapuche women cooperative was created for the services at the dining room.
  • It was necessary to build two bridges to access the site.
  • Water was pumped 24 hours a day to make the foundation works possible at the flooding area.
  • Equipment deadlines have been renegotiated with suppliers and air transport was used to shorten deadlines.
  • A very strength coordination was necessary to work with substructure to ensure the quality of the work.
  • Road survey was continuously done, always trying to reduce the number of hours for the crane movements.


Successfully completion of the wind farm without accidents and with satisfactory quality standards.


Client: Mainstream

Location: Los Ángeles, Chile

Wind turbine: Goldwind 1500 KW Wind Turbine Generator System

Power: 33 MW

Execution time: December 2012 - December 2013

bop wind

Minimizing the local impact through cooperation with the community


  • It was a big project which includes: permits processing, geotechnical investigation, civil works, substation and control building, engineering, power line, assembly and commissioning.
  • The deadline was very tight due to a delay on hte the foundations design.
  • Winter weather conditions complicated the usual rhythm of civil works.
  • The wind farm is located in the middle of a community of farmers and cattle breeders


  • An increase of resources has been implemented in order to reach the deadline, which was extended due the delay of the final design of foundations.
  • H&S measurements following GES standards were applied, to reach a safe work site and to prevent any interference to the local population.
  • GES collaborated to maintain a friendly relation with the land owners and the community, helping them with the tools and resources on site and trying to minimize the impact of the project.
  • Continuous interface between GES staff on site, GES engineering department in Spain and the Client in Chile and in Ireland.


  • The result in terms of quality and schedule compliance was excellent. Continuous improvement in H&S issues along the Project, reflected in the good results obtained in the audits done by the Client. All fo this helped to increase of GES notoriety in Chile, a growing market at that time.


Client: Vestas

Location: Ovalle, Chile

Wind turbine: 15 V100 2MW T80 + 30 V90 2MW T80

Power: 90 MW

Execution time: June 2012 - December 2012

bop wind

A record project


  • Talinay is the first Wind Farm that GES has built in Chile.
  • Construction of 25km of access roads required for the site built in various terrain and ground conditions.
  • The project goal for construction and commisioniong was under tight deadlines for completion.
  • The main milestone was to have all the turbines ready for commissioning before the 31st December 2012.


  • A comprehensive programme was established to ensure each turbine line with the required production of each phase and the necessary resources to complete all tasks within the required timeframe.
  • We installed a Ready mix Concrete plant on-site for the supply on all turbine foundations, within the wind farm, which resulted in greater flexibility and control.
  • A detailed logistical survey was completed prior to project commencement (to decide between sea or air transport) assisting the procurement and lead in times of required materials in accordance with programme requirements resulting in avoidance of potential delays.
  • We overlapped some of the tasks such as the concrete paving and the Medium Voltage grid to complete the project within the timeframe.


BOP was accomplished within the contractual scope and GES successfully assembled and installed the 45 turbines on time. The project was completed in a record time of 6 months and with no accidents.

Sierra Gorda

Client: ENEL Green Power

Location: Calama, Chile

Power: 112 MW

Execution time: June 2016 - December 2016

bop wind

Efficient solutions to deal with climatic difficulties


  • One of the main issues in the project was the "chusca" in this region ground, a fine sand which must be mitigated with water to comliance with the enviromental regulation of the area. Water must be carry on from Calama, the nearest city. 
  • Weather conditions made it dificult for the concret to harder. 
  • GES was in charge of the construction from the work area facilities for all suppliers working in the plant.  


  • To avoid the chusca inconveniences, the ground was stabilized with quarry material.
  • To compliance the project schedule, GES needed to install two work plants, to have an extra time for the harder of the concret.
  • Electric installation of the working facilities was made with an hybrid system: 3 mini-wind turbines form 1 kW and 44 solar panels from 300 W/ each, with a capacity of 13,5 kW. termal solar power was used for the water. This was the first time an installation alike was installed in a temporary construction. 


Despite all the issues and the bad weather conditions during the execution, the project was completed in time applying GES Quality and Health and Safety standards. 


Client: Vestas

Location: Santo Domingo del intenio (Oaxaca, México)

Power: 101 MW

Wind turbine: V-90.2 MW

Schedule: September 2010 - July 2012

bop wind

Succeeding with the first phase of a huge new 400 MW wind farm in Mexico


  • Strong and consistent winds meant that the assembly of the wind turbine components would be particularly challenging.
  • In order to build a good working rapport with local staff, a clear understanding of the indigenous culture was vital.
  • Due to its terrain, its isolation and its social mix, this area of Mexico is a notoriously difficult environment to work in, and many civil engineering projects are subject to long delays.


  • In order to meet the tight timescales, we completed much of the assembly at nighttime when the strong winds die down.
  • We worked particularly hard to learn about this region of Mexico – in order to understand the local culture and the outlook of the indigenous populations.
  • We gradually introduced the local staff to the project, and worked particularly closely with local technicians – in order to successfully transfer our own knowledge and skills.
  • We worked hard on building collaboriation and rapport across the extended team, and ensured that they could call upon the right level of resource.


Due to the speed and efficiency of our assembly processes, we were able to complete the project more quickly than had been anticipated – which led to a substantial saving in the cost of the crane rental. Also, the project was completed without any accidents. And the wind farm can now be relied upon to deliver more than 4,000 wind hours each year.