Technical consulting services for wind power

Engineering and development of power generation

The Group’s Engineering Unit (formerly Gas Natural Fenosa Engineering, now Gas Natural Generation Engineering and Development) won the contracts for consulting and international technological advisory services on the Sere and García Moreno wind farms.

ico_check_naranjaProject management, engineering and construction supervision for the 100 MW Sere wind farm owned by the South African electric company Eskom.

ico_check_naranjaPre-feasibility and feasibility studies for the García Moreno wind farm, with 35 MW of gross electric power, being developed by the Government of Ecuador through the institutions of its Ministry of Electricity and Renewable Energies and the National Pre-investment Institute.

International consulting

The Group’s engineering unit has been providing technical advisory services for wind power to international electric companies and the Government of Ecuador since 2002.

Engineering services

Engineering services were provided over a three-year period for four million euros, consisting of the following:

ico_check_naranjaAssessment of wind resources available at the site

ico_check_naranjaSelection of the wind technology to be installed in the wind farm.

ico_check_naranjaTechnical assistance for awarding and signing the main construction contracts in the following packages: BoP of the wind farm, civil engineering works for several buildings and BoP of the electrical substation and interconnecting electrical line.

ico_check_naranjaReview of detailed engineering

ico_check_naranjaSupervision of construction and start-up

ico_check_naranjaProject management.

Project development

Three teams were put together for project development:

  1. Expat Spanish team in South Africa: comprising the in-country project manager, the quality expert, the health, safety and environment expert, the planning and cost control expert, the electrical engineering expert, the wind turbine assembly expert and the site manager.
  2. Local South African team supporting the Spanish team: comprising one civil engineering expert, two secretaries and one technical assistant.
  3. Spanish team located in Madrid: comprising the Madrid-based project manager and a group of technical experts from all the engineering areas involved: wind resource, expert in wind turbines, civil and electrical engineering, and experts in health, quality and the environment.

The contract also included an ambitious training plan for Eskom staff, aimed at providing their engineers with the know-how they require. The training plan consisted of giving several courses on different subjects related to assessment and analysis of wind resources, and managing, engineering and construction of wind farms. The courses were given by professionals from Gas Natural Fenosa’s Engineering Group.

The construction and start-up of the Sere wind farm was a major milestone for Eskom, as it is its first high-power wind energy project and one of the largest in South Africa. The project was funded by the World Bank, which carried out continual audits and visits to verify its evolution and construction.


Some of the project’s major milestones include:

  • 15-03-2013:Start of the technical assistance contract
  • 25-09-2013: Construction of the first wind turbine foundation
  • 02-12-2013: Assembly of the first wind turbine
  • 11-07-2014: Powering-up of the substation and electrical line
  • 15-10-2014: First generation line goes on network
  • 14-02-2015: Completion of the wind farm start-up


The Sere wind farm project has been recognised with several awards:

ico_check_naranjaWind Energy Pioneer Award

ico_check_naranjaGreen Grand Prix Award

ico_check_naranjaEskom Best Project of 2015.

Moreover, the Sere wind farm project was the first technical services provision contract for the Eskom electric company, which is Africa’s largest utility, generating 95% of the power in the country of South Africa and 45% on the continent overall. The know-how of the Gas Natural Fenosa engineering group (acquired over more than 20 years of experience in the field of wind power in Spain) was key to the project’s success, including methodologies for project development during design phases and during project management, construction, supervision and start-up.


Project fact file

Project name: Sere wind farm
Where: Koekenaap, 340 km north of Cape Town, Western Cape province (South Africa)
When:  From March 2012 to March 2014
Customer: Eskom
Brief description:  100 MW wind farm comprising 46 wind turbines with 2.3 MW of rated power each, hub height of 115 metres and rotor diameter of 108 metres.

Basic parameters:

Number of wind turbines: 46 units with Siemens SWT 108 technology
Wind turbine power: 2.3 MW
Hub height: 115 metres
Rotor diameter: 108 metres
Blade length: 53 metres
Total/rated electrical power: 105.8 / 100 MW
Length of roads: 24 km
132 kV interconnecting electrical line: 44 km in length
132 kV electrical substation: Double position line-transformer 2 x 80 MVA.
Net/annual operational hours: 3,200 hours
Energy produced: 320 GWh/year
Investment budget: 190 million USD

The García Moreno wind farm project is located in the town of the same name, in Carchi province, Ecuador. It has 35 MW of gross electrical power. The engineering services contract was for 700,000 USD and was funded by two years of loans from the World Bank, broken into two phases: the pre-feasibility phase and the feasibility phase.

Pre-feasibility phase

It mainly focused on measuring and quantifying the wind potential and doing the preliminary environmental impact assessment (PEIA), which included the following tasks:

ico_check_naranjaSite selection for installing wind resource measurement stations

ico_check_naranjaWind measurement campaign at the site

ico_check_naranjaPreparation of the wind atlas:

ico_check_naranjaPreliminary Environmental Impact Assessment.

ico_check_naranjaGeology and soils report

ico_check_naranjaReport on air traffic and radar areas.

Feasibility phase

The wind farm was designed and planned. A focus was placed on completing the wind resource measurement campaign and preparing the following project documentation:

ico_check_azulMicrositing study assessing the wind resource.

ico_check_azulFinal Environmental Impact Assessment

ico_check_azulCartography, topography and surface roughness: Topographical survey of the area

ico_check_azulSoil mechanics study and design of the wind farm foundations.

ico_check_azulDesign of the wind farm’s platforms, roads and trenches

ico_check_azulFeasibility study on getting the wind turbines to the site from where they enter the country

ico_check_azulBasic design of the wind farm’s LV, MV and substation

ico_check_azulDesign of the evacuation line for the energy generated

ico_check_azulElectrical study on interconnecting and operating with the National Interconnected System

ico_check_azulEconomic-financial report for the project.

ico_check_azulDocumentation to qualify the project as a Clean Development Mechanism (CDM): PIN and PDD.

Teams and travel

The work was carried out in Madrid with occasional trips to Ecuador as required by the client to:

ico_check_naranjaDetermine the location of the two stations for measuring the wind resource

ico_check_naranjaGive the wind power training and impart knowledge.

ico_check_naranjaAttend meetings to track progress, make critical project decisions, and present results.

The transfer of knowledge was one of the project’s most important milestones, given the importance placed on it by the Government of Ecuador. This included three one-week training sessions at different stages. The sessions were given to technical experts from the Ministry of Electricity and Renewable Energies and the National Pre-investment Institute, as well as to students of Universidad Central de Quito.

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Engineering, construction, operation and maintenance of assets and plants