Next step for Hywind Tampen

April 22, 2021 07:04 CEST | Last modified August 9, 2021 15:17 CEST
Photo of Hywind Tampen spar-substructure and support vessel
11 substructures are transported from the Aker Solutions yard at Stord to the deep-water site at Dommersnes. (Photo: Woldcam / Equinor ASA)

The Hywind Tampen project is now moving from Stord to the deep-water site at Dommersnes where the concrete slipforming of the spar-substructures will be completed. This is the first concrete slipforming for an offshore project on the Norwegian continental shelf since the Troll A platform was delivered in 1995.

This week started the transport of the 11 substructures from the Aker Solutions yard at Stord where the first 20 meters have been built to the deep-water site at Dommersnes where the slipforming work will continue to 107,5 meters.

Hywind Tampen is an 88 MW floating wind power project intended to provide electricity for the Snorre and Gullfaks offshore field operations in the Norwegian North Sea. Hywind Tampen will be the world’s largest floating offshore wind farm and the world’s first to power offshore oil and gas platforms. It is also the first floating wind project from Equinor using concrete technology for wind projects.

“The project represents a direct transfer of technology from oil- and gas to renewable. The giant Troll A substructure was 369 meters. Now we are building 11 small Trolls. The project is on schedule despite the challenges around covid-19,” says Olav-Bernt Haga, Equinor’s project director for Hywind Tampen.

2021 is the year of manufacturing for this pioneer project. Whilst the structures are being built at Stord and Dommersnes, the steel anchors are being welded together at Aker Solutions yard in Verdal. The nacelles, blades and turbine towers will be produced in Europe and shipped to Wergelands base in Gulen.

The substructures will be towed to Gulen when the slipforming and mechanical completion work is completed at Dommersnes.

In 2022 all the elements will be collected at the site in Gulen and the assembly work will start using what is probably the largest crane that has been onshore in Norway.

“We plan to start towing the completed wind turbines to Tampen early summer of 2022 and complete the offshore work by the end of the year. This is a large and complex industrial project where we use our experience from oil and gas projects,” says Haga.

Photo of Olav Bernt Haga
Olav-Bernt Haga, Equinor’s project director for Hywind Tampen. (Photo: Ole Jørgen Bratland)

As a global major in offshore wind with decades of experience in developing offshore energy - oil and gas, Equinor is uniquely placed to drive forward the global development of floating offshore wind.

In 2009, Equinor installed the first ever floating offshore wind turbine, and Hywind Scotland followed in 2017 as the world’s first commercial floating offshore wind farm.

As the operator of Hywind Tampen, Equinor will be responsible for operation and maintenance of the wind farm.


  • The Gullfaks licence: Equinor Energy AS: 51%, Petoro AS: 30%, OMV (Norge) AS: 19%.
  • The Snorre licence: Equinor Energy AS: 33.3%, Petoro AS: 30%, Idemitsu Petroleum Norge AS: 9.6%, Wintershall Dea Norge AS: 8.6%, Vår Energi AS: 18.6 %.

Related pages and downloads

Photo of Hywind Tampen spar-substructure and support vessels
Hywind Tampen substructure at Stord before the transport to the deep-water site at Dommersnes. (Photo: Woldcam / Equinor ASA)

Hywind Tampen facts

  • Along with our partners, we are developing the world's first floating offshore wind farm to supply renewable power to offshore oil and gas installations.
  • Aims to cover parts of the power needed to supply the Snorre and Gullfaks oil and gas fields with floating wind power.
  • The investment in Hywind Tampen will be just under NOK 5 billion. Through Enova, the Norwegian authorities have awarded funding support up to NOK 2.3 billion. The Business Sector's NOx Fund has also decided to support the project with up to NOK 566 million.
  • Eleven units with a total capacity of 88 MW.
  • Located about 140 km off the Norwegian coast.
  • Water depth in the wind farm area is between 260 and 300 metres.
  • Significant reduction in CO2 emissions, estimated at 200,000 tonnes per year.
  • Installed on floating concrete structures with a shared anchoring system delivered by Kværner.
  • Equipped with eleven turbines of the type Siemens Gamesa SG 8.0-167 DD.
  • With a 167-metre diameter rotor and 81.5-metre-long blades, each turbine in the wind farm will have a swept area of 21,900 square metres.
  • The wind turbines will be connected in a network with a capacity of 66kV.
  • Scheduled to start up in the third quarter of 2022.

The contracts and who they were awarded to

  • Siemens Gamesa Renewable Energy: Turbine Supply Agreement; Design, procurement and fabrication of the wind turbines, assembly and completion on land and at sea.
  • Wind turbine maintenance will be carried out by Siemens Gamesa's Norwegian service organisation, which has been awarded a 5-year contract in connection with the wind turbine delivery.
  • Kværner AS: Hulls; Design, procurement and fabrication of hulls and marine operations, incl. administration of assembly site; Planning and execution of all activities at the assembly site. Procurement (option), design and installation of the anchoring system. All marine activities associated with assembling the wind turbines on land, moving the floating wind turbines, and towing and anchoring out on the field.
  • The turbines will be assembled at Wergeland Base in Gulen in Vestland county.
  • JDR Cable Systems: Cables; Design, procurement and fabrication of export cables and cables between each wind turbine.
  • Subsea 7: Cable installation; Installation of cables between the turbines and between the farm and Snorre A and Gullfaks A.
  • Wood Group: Modification work on Gullfaks and Snorre.