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Home/Grid/Grid developement/Onshore projects/Grid reinforcement Teltow-Fläming

Grid reinforcement Teltow-Fläming

Project no. 87, designated in the Bundesbedarfsplangesetz (BBPlG, Federal Requirements Plan Act) consists of several project components in the larger Berlin-Brandenburg area. All with the goal to improve the region’s security of supply in times of a changing energy landscape and an increasing power demand. The overhead line project ‘Grid reinforcement Teltow-Fläming’ is part of this package of measures.

Project overview

Line route

The overhead line project will have a total length of 25 to 30 kilometres and consists of two parts: the construction of a new line is planned between the existing substation near Trebbin (1) via a yet to be approved substation site to the west of Blankenfelde-Mahlow (2) up to the substation near Kleinziethen that is currently being build (3).

This new line will be a 380-kV overhead line that will replace the existing 220-kV overhead line from the 1970s. The plans are based as closely as possible on the existing route. Deviations from the current route shall be reviewed, for instance to unburden residential areas, conserve nature or enable the bunding with other linear infrastructure (such as streets, railways, etc.)

To the west of Blankenfeld-Mahlow, a new overhead line will branch out towards Berlin-Lichterfelde (4). The course of the new 380-kV overhead line will orient itself towards the new substation to be built to the west of Blankenfelde-Mahlow. We are still looking for suitable site locations for this substation. This part of the line ends at a terminal tower at the Berlin-Brandenburg city limit (5) and continues as an underground cable in the Berlin area as a separate line project.

To apply for the planning approval under § 19 of the Grid Expansion Acceleration Act (Netzausbaubeschleunigungsgesetz, NABEG), route variants have now been developed and submitted to the Federal Network Agency (Bundesnetzagentur, BNetzA):

Procedural steps

  • In July of 2023, 50Hertz presented the first plans to the public on site in the Teltow-Fläming district.
  • In November of 2023, 50Hertz once again issued an invitation for information meetings and informed people about the course of the route proposal.
  • On 31 January 2024, 50Hertz submitted the application for planning approval under § 19 of the Grid Expansion Acceleration Act.
  • The Federal Network Agency published the application documents onnetzausbau.de in February of 2024.
  • On 13 March 2024, the Project Conference of the Federal Network Agency took place in Potsdam. Once more, citizens as well as legally responsible public authorities were able to present their respective topics on site and in person.
  • The Federal Network Agency (Bundesnetzagentur, BNetzA) published the survey scope under § 20 of the Grid Expansion Acceleration Act (Netzausbaubeschleunigungsgesetz, NABEG) in June 2024. This can be consulted in the BNetzA’s online offer on ‘netzausbau.de’ (only available in German): Netzausbau – Leitungsvorhaben 87 (grid expansion: line project 87)
  • 50Hertz is planning information meetings about the draft plans in late 2025, based on the §21 NABEG documents.

The current state of affairs for the planning is available as detailed maps and GIS data, which are available in the download area below.

The commissioning is planned for 2023, especially for the construction of the new overhead line, depending on the commissioning of the neighbouring grid expansion projects in the Berlin area. In accordance with the Grid Expansion Acceleration Act (Netzausbaubeschleunigungsgesetz, NABEG), the approval procedure is carried out by the Federal Network Agency (Bundesnetzagentur, BNetzA) in Cottbus.

CONTACT

Stefan Tophofen

Public Participation

Status

Need and legal background

As a conurbation and capital city with a high population density, the metropolitan area of Berlin already makes high safety and reliability demands on 50Hertz with regard to grid provision and grid operation. In view of the population growth and the energy transition of Berlin, this leads to new framework conditions that require the development of the transmission grid in the region.

The ‘Grid reinforcement Teltow-Fläming’ project was first introduced in 2021 as part of Project P531 ‘Grid expansion and reinforcement of Berlin’ in the grid development plan (NEP) for 2035. Project P531 can also be found in the current draft of the grid development plan for 2035/47. In the Bundesbedarfsplangesetz (BBPlG, Federal Requirements Plan Act), the project was decided by the legislator as Project no. 87 and therefore needs to be planned and implemented by 50Hertz.

Technology

The current 220-kV overhead line was built in 1972/73 with an original intensity of current of two times 1.070 amperes. In other words, the system, consisting of three conductors on the left side of the tower and their counterparts on the right side of the tower, was able to transmit a current intensity of 1.070 amperes per side and, therefore, a total current intensity of 2.140 amperes. For the new overhead line, the following applies: the voltage level is raised to 380 kV and the current intensity is increased to two times 4.000 amperes (for a total of 8.000 amperes). This requires new, more powerful conductors that, in turn, require new overhead line towers to be able to carry their greater weight. As a result, considerably more electricity can be sent through the lines. Although this increases the magnetic flow density, all limits of the Bundesimmissionsschutzverordnung (BImSchV, Ordinance on the Implementation of the Federal Immission Control Act) are still complied with.

Public participation

As part of the planning and permitting procedure, the law already provides extensive measures to involve the general public. Nevertheless, 50Hertz will also inform affected administrations, elected officials, associations, nature conservation organisations as well as citizens on the project milestones and ask them for input regarding the plans. Opportunities for dialogue are announced on this website, via local media as well as in the project newsletter. You can subscribe to the newsletter here with only a few clicks.

Information and Materials

Detailed information on the project’s progress as well as other materials are available on the following pages (all in German language):