0 of 0 for ""


The North Sea

Adviser on the Energy Island

As an adviser to the Danish Energy Agency, Sweco is helping to prepare the tender for construction and ownership of the Energy Island in the North Sea.

The Energy Island is a pioneering project and a role model for the green transition, which will eventually supply 10 million households with green electricity.

The North Sea
The Danish Energy Agency
In progress

In June 2021, Sweco won the agreement to prepare the preparatory phase of the tender for the Energy Island in the North Sea – an agreement worth DKK 50 million. The following year – in July 2022 – Sweco won the task as technical advisor for the Danish Energy Agency during the remaining phases of tendering, design, construction and final handover of the island. The contract has a value of DKK 400 million with a maximum of DKK 600 million

The Energy Island in the North Sea must help ensure that Denmark make the most of its unique offshore wind resources in the best possible way and at the same time become a front runner for the green energy transition globally.

Together with other selected advisers, Sweco will help the Danish Energy Agency define the concept for the Energy Island, prepare tender documents, scrutinize technical solutions and offers, evaluate bidders and conduct supervision and quality assurance during the construction and handover of the Energy Island.

Together with Sweco and our other partners, we are embarking on a historic and extremely demanding task – to develop the strongest possible, future-proof concept for the Energy Island in the North Sea.
– Mogens Hagelskær, deputy director responsible for the Energy Islands at the Danish Energy Agency

Power for 10 million households

In the first phase the Energy Island should be able to handle 3-4 GW, which corresponds to the power consumption of 3-4 million households. Over time, the island must be able to accommodate 10 GW.

The project has an enormous technological development potential within the green transition, offshore wind, marine technology, energy storage and Power-to-X. It has the potential to become Denmark’s next wind adventure and will contribute to building new knowledge and valuable experience, which in the long run will help Denmark and the rest of Europe on the journey towards climate neutrality.


The largest construction project in Danish history

The Energy Island will be the largest construction project in Danish history with an estimated total construction cost of DKK 210 billion. DKK. This corresponds to approx. four Fehmarnbelt connections.
On the project, Sweco advises the Danish Energy Agency in close cooperation with the sub-advisors Implement Consulting Group, MORE Consulting, WorldPower Consulting, Hegelund Advice and EPConsult Energies Nord.

Sweco is building a Center of Excellence for Energy Islands

It is a complex pioneering task project that the Danish Energy Agency has placed in the hands of Sweco, as its technical adviser Sweco. Not only that will the world’s first energy island will be built approx. 100 kilometers out in the North Sea with a sea depth of approx. 30 meters – the ambitions are is also to supply the whole of Denmark and several neighboring countries with green energy. The projectIt therefore requires new thinking, innovation and interaction between many disciplines and different parties to ensure the completion of the project.

At Sweco, we benefit from being a large consultancy house that includes all engineering and architectural skills. Precisely theThis close cooperation between our engineers and architects is a big gain advantage for the progress of the project, because . There is a need for close coordination of between many disciplines is needed when a technically demanding pioneering project is to be visualized and designed at the same time as we ensure that the island can meet the requirements and expectations for future use.

Imagine if the Energy Island in the North Sea could be the model for Energy Island New York or Energy Island Tokyo and contribute to making the world’s megacities self-sufficient within green electricity. Then we can really could truly create a new green business adventure for Denmark and support the green energy transition globally.
– Karl-Martin Buch Frederiksen, head of innovation, Sweco Architects


Denmark’s idea of an energy island has opened everyone’s eyes to the advantage of the unique opportunities we have in interaction with the sea and the wind. It will be very very exciting to see where that idea has taken us 10 years from now. With the Energy Island, I have renewed faith that we can actually realizerealize the green transition.
– Karl-Martin Buch Frederiksen, head of innovation, Sweco Architects

11 professional tracks and 100 employees

Sweco’s project organization consists of 11 professional tracks and several interdisciplinary, coordinating efforts. Associated with the project are architects who work with the island’s layout and design, specialists who work with electrical engineering and structural concept and other expertise experts who contribute with knowledge about energy technology, environment, sustainability, the EU’s taxonomy, LCA calculations and carbon cost during the island’s lifetime.
In total, approx. 100 colleagues from Denmark, Norway and Sweden are engaged in preparing the tender and the subsequent phases.

The comming years of working on Energiøen means that Sweco will build a market-leading position within offshore energy and transmission. The project sharpens our abilities to work across disciplines and national borders, and it generates unique knowledge about big offshore projects in the organization.

We will transfer utilize that this knowledge into to createing a Center of Excellence, which we want to include in our consultancy on similar energy island projects across the North Sea, the Baltic Sea and the rest of the world.

Fakta om Energiøen

What is an energy island?

An energy island is an artificially created island in the sea that acts as a hub for energy. The island collects energy from surrounding offshore wind farms and distributes it to the electricity grid.

What should an energy island be able to do?

An energy island aims to collect and distribute green power directly to consumers. The electricity is transported through underwater cables – both to Denmark and to the neighboring countries. With the energy island as a gathering point, we can produce, buy and sell electricity in large quantities across national borders.

Where is the Energy Island meant to be located?

The island will be established in the North Sea 80 km from land west of Thorsminde and will be built on a site where the sea depth is 30 metres.

Who is involved in the project?

The Danish Energy Agency owns and operates the project and is advised by Sweco as technical advisor in close collaboration with Ernst & Young as financial advisor and the Attorney General as legal advisor.

When will the Energy Island in the North Sea be ready?

During the first half of 2023, the tender for ownership and construction of the Energy Island will be launched.


In 2033 the Energy Island will be ready as a hub for 3-4 GW offshore wind farms. By 2040 at the latest, the island must have a capacity of 10 GW and thus be able to cover the consumption of electricity for approx. 10 million households in Denmark, Germany, Belgium, the Netherlands and possibly more countries.

How does the Enegy Island in the North Sea contribute to the Danish climate goals?

Denmark’s long-term goal is that by 2045 we must be a climate-neutral society, where no more greenhouse gas is emitted than is absorbed – and by 2050 we must have reduced the emission of CO2 by 110%. Here, the establishment of the energy islands in Denmark plays a key role.


The Energy Island must ensure that Denmark can electrify several parts of society and at the same time contribute to ensuring that all Danish households’ and businesses’ electricity consumption is covered by green electricity. In addition, the electricity must be exported to our neighboring countries and contribute to the green transition in Europe.


Over time the Energy Island must be able to connect technologies that can store or convert the green power into, for example, green fuels (through Power-to-X). It will be relevant to develop green propellants for e.g. aircraft, cargo ships and heavy industry.