Filter by Themen
Analytik & Hygiene
Nachhaltigkeit & Umweltschutz
Water Solutions
Filter by Kategorien
Forschung & Entwicklung
Products & Solutions
Produkte & Verfahren
Trade & Industry
Filter by Veranstaltungsschlagworte
Emerging Pollutants
FS Logoi

Assembling floating offshore wind farm in Norway

Kategorien: |
Autor: Charlotte Quick

Could floating offshore wind farms produce the energy of the future?
Foto: Mammoet

May 16, 2023 Ι The floating offshore wind farm “Hywind Tampen” is being built in the North Sea off Norway. What can the plant achieve in detail and what risks for the environment does the project entail?

Floating offshore wind will be key to delivering cost-effective renewable energy to consumers. Equinor is leading the way in developing this technology with Hywind Tampen, the largest floating wind farm to date. It is located in the North Sea off Norway. It delivered its first electricity on November 13, 2022. Seven of eleven turbines were connected to the grid by the end of last year. The last four turbines were assembled last autumn and will be installed on the field during a weather window in 2023. Meanwhile, the installation of the Sørlige Nordsjø II wind farm is already being planned.

Smooth production line: Floating foundations required

The market is still developing, and although various component designs, installation techniques and deployment methods are being considered and prototyped but none have been commercialized at full scale. Floating foundations were required for the Hywind Tampen project as the water depth and seabed geology in the Tampen area made it impossible to install conventional fixed-bottom turbines.

A critical challenge was the work involved in assembling the entire 8.6 MW turbines – including tower sections, nacelles and blades – onto huge 107m spar buoys that lie mainly underwater. This needed to be performed in the controlled environment of a port – where the whole system could be kept as static as possible – before the completed turbines were towed out to their installation site. With such huge floating foundations, this port required an exceptionally large draft – ruling out jack-up vessels, which would be too short to assemble the turbine sections. Also, though conditions at Gulen Industrial Harbor were calm, using crane vessels would increase the complexity of assembly engineering, which would then require transfer between two floating objects.

A spacer barge between the quay and spar foundation was needed to ensure adequate clearance between the base of the foundation and the seabed. Martin Tieman, Project Manager for Mammoet, explained:

“We recognized that we would need a crane with a huge outreach to make the required lifts. The majority of land-based cranes in any fleet would not be able to achieve a 143m distance at these weights, but we knew that if it could be done the project would benefit significantly. This would create a smooth production line from marshalling yard to turbine assembly to commissioning – all at the same location – optimizing the use of offshore assets. With the port confirming the quayside would be able to provide the required ground bearing pressures, we were able to put together a plan that would deliver a comprehensive package of port handling and assembly of all eleven turbines of Equinor’s development.”

More Information

Floating offshore wind farms: Energy of the future?

Hywind Tampen is a floating wind farm in the final stage of construction that will provide electricity for the Snorre and Gullfaks oil and gas fields in the Norwegian North Sea. It will be the first floating wind farm to power offshore oil and gas platforms. With a system capacity of 88 MW it will also be the world’s largest floating offshore wind farm and an essential step in industrialising solutions and reducing costs for future offshore wind power projects. When Hywind Tampen is operational, Equinor will operate nearly half (47 %) of the world’s floating wind capacity. The wind farm is estimated to meet about 35% of the annual electricity power demand of the five Snorre A and B, and Gullfaks A, B and C platforms. In periods of higher wind speed this percentage will be significantly higher.
Hywind Tampen will be a test bed for further development of floating wind, exploring the use of new and larger turbines, installations methods, simplified moorings, concrete substructures and integration between gas and wind power generation systems. The floating wind farm will consist of 11 wind turbines upgraded from 8 to 8.6 MW. The capacity in the export system and on the platforms has not been upgraded accordingly, however the increased capacity could contribute to increased yearly total production due to increased uptime. Operational experience with the completed facilities can also contribute to improve the production capacity through increased utilisation rate.
Learn more about Hywind Tampen

Develop the North Sea as an offshore energy hub

Large-scale offshore wind farms at Sørlige Nordsjø II (SN2) will deliver renewable energy to Norway and potentially Europe, contributing to further develop the North Sea as an offshore energy hub, and create new industrial opportunities for Norway as an energy nation. The Norwegian Government announced in February 2022 that the first phase of the SN2 area will be an auction to develop a 1.5 GW windfarm that provides power to the Norwegian mainland. The second phase of SN2 could be a hybrid project (1.5 GW), delivering power to both Norway and Europe.

“We are pleased to enter into this initiative. The Norwegian Government has set a target for offshore wind of 30 GW in Norway by 2040. The North Sea has among the world’s best wind resources. A large-scale offshore wind farm at Sørlige Nordsjø II could play a key role in expanding the North Sea as an offshore energy hub, and create new industrial opportunities,” says Arne Eik, project director for Sørlige Nordsjø II from Equinor.

The companies Equinor, RWE and Hydro share the commitment of contributing to the ongoing energy transition. They bring a broad and complementary set of experience and capabilities in all parts of the offshore wind value chain from development, production, and route to market to the benefit of the Norwegian society and the decarbonisation of the electricity system.

Sørlige Nordsjø II

An offshore wind consortium consisting of Equinor, RWE Renewables and Hydro REIN, has signed a Memorandum of Understanding (MoU) with Windport AS, a supplier of port facilities in the Mandal area.

“The expansion of offshore wind is a crucial factor for a successful energy transition in Europe. We at RWE will bring in our extensive experience and knowledge and contribute to help Norway in delivering its offshore wind ambitions, together with our partners,” says Matilda Machacek, Development Nordics RWE Renewables.

The companies jointly aim to develop a large-scale bottom-fixed offshore wind farm in the area in the North Sea. Windport AS, a wholly owned subsidiary of Global Ocean Technology, aim to provide port facilities for the development and construction phase of the wind farm. In the agreement signed with Windport AS, the parties have agreed to exchange and discuss information to assess feasibility for a potential industrial development, related to such port facilities. The agreement does not cover operations and maintenance base facilities. This is covered in a separate process towards potential Norwegian harbor locations. The Norwegian Government has announced that the first phase of the Sørlige Nordsjø II area will be auctioned during 2023, giving the winner the opportunity to develop a 1.5 GW windfarm that provides power to the Norwegian mainland.

Learn more

What influence does the offshore wind farm have on life underwater?

“Offshore wind farms have a worrying impact on wildlife and the environment. Because they threaten marine protection,” writes VeganStrom on its website. Biologist Dr. Georg Nehls talks in detail about the challenges posed to wildlife by offshore wind farms:

“There are species that benefit and there are species that suffer. Fish, for example, benefit because there are fishing bans in the wind farms. Benthic creatures, i.e. those that live on the seabed, such as crabs and lobsters, also colonise the new habitats. Negative impacts are mainly observed in marine mammals and birds.” (Dr. Georg Nehls Ørsted)

A report by NDR highlights NABU’s findings and the conflicting positions of environmentalists.

Rotors pose a danger to birds:

A special challenge for bird conservationists are the wind farms at sea, the so-called offshore parks. It is almost impossible to determine the number of victims there. There are fears that flocks of birds could be attracted by the light of the turbines in special weather conditions and die there in the rotor blades by the hundreds or thousands.
As a precautionary measure, the turbines or the warning lights could be switched off in certain weather situations. At the Bürgerwindpark Ockholm-Langenhorn in Schleswig-Holstein, turbines are currently being tested that should make the permanent flashing lights superfluous: The lights, which are also unpopular with residents, are to be illuminated by radar technology only when aircraft are in the vicinity.

Noise pollution during construction:

Whether the recent high number of harbour porpoises washed ashore has anything to do with the expansion of the wind farms remains open. The carcasses are not examined more closely for cost reasons, says Ursula Siebert from the Institute for Terrestrial and Aquatic Wildlife Research in Büsum (Schleswig-Holstein).
Studies show that harbour porpoises avoid the area for up to 20 kilometres during the noise-intensive construction work. Environmentalists fear that large evasive movements could have a negative impact on the development of the species. In the Baltic Sea, for example, there is a porpoise population of no more than 600 animals, whose existence is threatened. Grey seals and harbour seals in the German Bight are also endangered by the underwater noise.

Das könnte Sie auch interessieren:

Passende Firmen zum Thema:


Water Sensitive Urban Design as a Role Model for Water Management in Germany?

Water Sensitive Urban Design as a Role Model for Water Management in Germany?

Autor: Jacqueline Hoyer / Juliane Ziegler
Themenbereich: gwf - Wasser|Abwasser
Erscheinungsjahr: 2013

“Water Sensitive Urban Design” (WSUD), originally developed in Australia, is a planning and design approach combining the functionality of water management with principles of urban design. WSUD is mainly used in the development of integrated ...

Zum Produkt

Tertiary Filtration with Ultrafiltration Membranes in Municipal Wastewater Treatment Plants

Tertiary Filtration with Ultrafiltration Membranes in Municipal Wastewater Treatment Plants

Autor: Martin Wett and Eberhard Back
Themenbereich: gwf - Wasser|Abwasser
Erscheinungsjahr: 2011

During the operation of tertiary filtration stages in a dead-end-mode, retentate concentrate and rinsing water from membrane cleaning accrue naturally. Work on process solutions for these process waters with no additional particle loads for the ...

Zum Produkt

Water Solutions – 01 2017

Water Solutions – 01 2017

Themenbereich: Water Solutions
Erscheinungsjahr: 2017

The leading professional magazine for water and wastewater ...

Zum Produkt

Sie möchten die gwf Wasser + Abwasser testen

Bestellen Sie Ihr kostenloses Probeheft

Überzeugen Sie sich selbst: Gerne senden wir Ihnen die gwf Wasser + Abwasser kostenlos und unverbindlich zur Probe!

Finance Illustration 03