Project fact file

The installation of 72 Nordex N149/5.x MW turbines – with a hub height of 105 metres and a rotor diameter of 149 metres – was completed in the 4th quarter 2021. These employ the very latest wind turbine technology and provide renewable energy with no CO2 emissions and the least possible impact on the surrounding natural environment.

Øyfjellet Wind Park will annually produce around 1,3 TWh. This is enough energy for 39% of Alcoa’s annual electricity needs, or for 82,500 households, around 178,200 people. This corresponds to 73% of all those who live in Nordland.

Annual expected production from the wind power plant is based on many years of weather data collection from measurement masts placed in the area designated for wind power. It starts with the maximum expected average production and subtracts losses due to various parameters, including electrical losses, icing, contractual availability, etc. Based on this, an annual expected production emerges, and for wind power, it is common practice to calculate what is referred to as P50, P75, and P90. At ØWAS, the following calculations have been performed:

  • P50 indicates a production of 1.3 TWh
  • P70 indicates a production of 1.2 TWh
  • P90 indicates a production of 1.14 TWh

Aluminium producer Alcoa, which is Mosjøen’s cornerstone industry, has purchased all power production from the wind park for the next 15 years. This guarantees opportunities for growth and contributes to safeguarding hundreds of Norwegian jobs.

The Municipality of Vefsn covers an area of 1,849 km2. The licenced area covers 40 km2, around 2% of the municipality. The roads, turbines and buildings cover 2-3% of the licenced area. The wind park is built on a consetrated area, and adjustments and improvements have continuously been made in line with feedback from the local community.


The project was taken over

Øyfjellet Wind took over the wind park from the developer


All turbines put into operation

All the 72 turbines were put into operation


72 turbines are installed

All 72 turbines are installed

MTA plan approved

The Ministry of Petroleum and Energy approved the environmental, transport and construction plan (MTA) for the development at Øyfjellet.

The municipal council in Vefsn approved agreement

The municipal council in Vefsn unanimously approved the agreement on the wind power plant at Øyfjellet on Thursday, 17 June. For Vefsn municipality, the agreement means that the municipality will receive a total of NOK 422.5 million over the granted concession period of 25 years.


Construction begins

Construction of internal roads, crane pads and turbine foundations.

Construction of transmission line

Construction of 132 kV transmission line between the wind park and Marka substation.

Construction of switchgear

Construction of 132 kV switchgear for connecting the wind park to Marka substation.

Objection review from NVE

NVE decides not to recognise the received objections to the ETC plan for the Øyfjellet wind power installation. NVE states that the assessments conducted have been carried out in compliance with the relevant regulations and the established assessment programme. The case has been submitted to the Ministry of Petroleum and Energy for the final decision.


Detailed plans approved

The detailed plans for realising the wind park – the environment, transport and construction (ETC) plans – are submitted. The plans are designed to ensure the least invasive development possible. Øyfjellet is taken out of the planning area after local consultation. The plans are approved by NVE in December 2019.

Main contractor

Veidekke is selected as the main contractor, alongside a number of local businesses as sub-contractors.

Road construction begins

Construction of the access road and improvements to Tveråveien begin.

Supplier of transmission line

Linka, from the Municipality of Inderøy, is selected to supply the 132 kV transmission line between the wind park and Marka substation.

Supplier of the interface between transmission line and substation

Helgeland Kraft, with headquarters in Mosjøen, is selected to supply the interface between the transmission line and Marka substation. This involves the delivery of 132kV main breaker to Marka substation.

Supplier of operations and maintenance of turbines

Nordex is selected as supplier of operations and maintenance of turbines, and is set to become a long-term member of the local business community.


Long-term power purchasing agreement

In order to secure access to local power, a long-term power purchasing agreement is agreed to the effect that all wind power produced for the next 15 years will go to the Alcoa aluminium works in Mosjøen.


NVE grants permission for 400 megawatt capacity.


Final authorization

The Ministry of Petroleum and Energy grants final authorization for the project.


Application submitted

Licence application submitted.

Support from the Municipal Council

Vefsn Municipal Council supports the application. Following dialogue with the local community, it is decided that the Øyfjellet area around Stortuva should not be developed.

License for construction given

The license for the construction of the wind park is given by NVE.


Project agreement

Local landowners and industry agree to the project to provide more green energy to industry.