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Home/Grid/Grid developement/Offshore projects/LanWin3

LanWin3

The LanWin3 offshore grid connection (NOR-11-1) will connect an offshore wind farm in the North Sea to the mainland. The wind farm area is located in the designated area N-11.1, approximately 120 km to the north-west of Helgoland, inside the German Exclusive Economic Zone (EEZ). A submarine cable runs from there to Büsum on the mainland across a distance of around 200 km. An underground cable of around 15 km then connects the line to the point of common coupling in the Heide survey area.

The offshore wind farm will deliver a capacity of 2,000 megawatts (MW). The connection to the power grid is established by 50Hertz using high voltage direct current (HVDC) transmission technology at a voltage level of 525 kilovolts. That is why in addition to the cable connection, 50Hertz will also build an offshore platform with a converter station in the area of the offshore wind farm. On the land side, the grid connection ends at a multi-terminal installation in the Heide survey area, which is still to be built. The expected date of completion for the offshore grid connection is 31 December 2032. The multi-terminal hub will be realised in cooperation with transmission system operator TenneT, which is in charge of creating the LanWin2 grid connection system that runs in parallel and will also connect it to the hub in the Heide survey area.

You can find more about the project and the activities under “News” or “Status”.

Overview of grid connection
Wind farm locationapprox. 120 km north-west of Helgoland
Capacity: Direct current voltage level:2,000 megawatts (MW)525-kilovolt direct voltage (DC)
Cable lengths:approx. 105 km in the Exclusive Economic Zone (EEZ). approx. 91 km in the coastal waters approx. 15 km on shore
Onshore point of common couplingNew direct current multi-terminal hub to be constructed in the Heide survey area, joint project with TenneT.
Operator of the cables and the offshore substation50Hertz Transmission GmbH
Status of the permitting proceduresIn all, three permitting procedures are required for the cable sections (1) in the German Exclusive Economic Zone or EEZ (incl. offshore converter platform), (2) in the coastal waters and (3) on land.
Expected date of completion within the meaning of § 17d (2) sentence 3 of the German energy industry act (Energiewirtschaftsgesetz, EnWG)31/12/2032

Status

Line route

The offshore route of the LanWin3 offshore grid connection runs from the offshore wind farm in the EEZ in the North Sea through the coastal waters and via the landing point in Büsum up to the multi-terminal hub in the Heide survey area in Schleswig-Holstein.

Offshore route

In order to minimise the environmental impacts, the submarine cables of LanWin3 are laid within a specified corridor, where they are bundled with other submarine cable systems.

The 525-kV submarine cable carries the electricity from the wind farm through the EEZ for approx. 105 km and then through the coastal waters for approx. 91 km. The cable crosses from the EEZ into the coastal waters via border corridor N-V. The submarine reaches the shore at the landing point near Büsum.

Onshore route

From the landing point, an underground land cable that is approx. 15 km long transports the electricity generated at sea to a so-called multi-terminal hub in the Heide survey area (municipalities of Hemmingstedt / Lieth / Lohe-Rickelshof / Wörden). This route is not only used by LanWin3, but other land cable systems as well. The course of the underground cable route should be as straight as possible to minimise its length. However, the route is still subject to a number of restrictions and requirements. Intersections with other lines, buildings, residential areas, streets and gas mains shall for instance be avoided or minimised as much as possible. This also applies to conservation areas, brush areas and sensitive biotopes.

Multi-terminal hub

At the direct current multi-terminal hub, the electricity is transported further through a DC line (the NordOstLink) and, via a converter, as alternating current towards TenneT’s AC transmission grid.

Permitting

The construction, expansion and conversion of electricity lines are infrastructural measures that affect many interests, like building development, agriculture and nature conservation. That is why the legislator has clearly arranged the processes for the planning and approval, such as in the German Energy Industry Act, among others.

A key planning instrument for grid development in Germany is the Grid Development Plan (GDP/NEP) for electricity. The LanWin3 offshore grid connection system (NOR-11-1) was confirmed in the 2037/2045 GDP of 2023 as part of the North Sea offshore expanded grid. The Federal Network Agency (Bundesnetzagentur) awarded a capacity of 2,000 megawatts to the wind farm.

In the permitting procedure for LanWin3, three permits need to be obtained from various planning approval authorities, as the cable route runs through different areas of competence. The planning approval procedure primarily deals with the “how” of the construction project (specification of the location, structures, technical implementation). Formal public participation plays an important part here. In any case, the legally responsible authorities shall be involved. During the permit procedure, the public is formally involved in accordance with the legal requirements.

50Hertz supports this with informal public participation, also known as citizen dialogue. Citizen dialogue builds on 50Hertz's own experiences, not on legal stipulations. This difference is important, as the citizen dialogue ends where the formal public participation laid down by law begins (see also ‘Transparency and public participation’).

(1) Permit for converter platform and offshore route in EEZ

For the converter platform and the line route in the German Exclusive Economic Zone (EEZ) in the North Sea, the federal government and therefore the Federal Maritime and Hydrographic Agency (Bundesamt für Seeschiffahrt und Hydrographie, BSH) is the competent permitting authority. The planning approval procedure for the EEZ covers the route section and offshore converter platform located there. It must furthermore undergo a certification process of the BSH. 

The BSH specifies the exact location of the platform within the wind farm. 50Hertz is planning, building and operating the platform as the project developer.

(2) Permit for offshore route in coastal waters

In the coastal waters, the state of Schleswig-Holstein is responsible for planning. The office for planning approval at the Ministry for Energy Transition, Climate Protection, Environment and Nature of Schleswig-Holstein is competent for the planning approval proceedings.

In order to minimise the impact of the environment, it is important to keep the length of the submarine cable as short as possible and to bundle the new route with other lines. That is why 50Hertz is working together with TenneT to lay the submarine cables as parallel as possible to the planned lines of the LanWin2 project.

(3) Permit for the onshore route

From the landing point near Büsum, where the submarine cable reaches the mainland, the electricity generated at sea is transported to the land-side multi-terminal hub along the onshore route by means of an underground cable.

For the onshore route permit, 50Hertz and TenneT are preparing the application documents for the planning approval by the office for planning approval at the Ministry for Energy Transition, Climate Protection, Environment and Nature of Schleswig-Holstein.

Early public participation

The formal public participation has been legally arranged in detail. Legally responsible authorities as well as associations and affected private parties shall be involved in this case. As a rule, the planning approval procedure takes 12 to 24 months.

As a supporting measure and in advance of formal public participation, 50Hertz organises informal early public participation. Read more about it under ‘Transparency and public participation’. This form of public participation, which is voluntary and based on own experiences, ends where formal public participation by the competent administration begins.

During the preparation of the construction phase as well as during construction work and until commissioning, 50Hertz also informs the public of the activities in the affected region in a transparent manner.

CONTACT

Tobias Frank

Offshore Projects
  • Tel:
    +49 (0)30 5150 3293
  • E-Mail:
    tobias.frank@50hertz.com
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