Construction of an underground connection

Construction of an underground connection

Improved reliability of the high-voltage grid

In order to meet the challenges of the energy transition while continuing to contribute to the security of electricity supply 24 hours a day, it is necessary to have reliable infrastructure. With this in mind and based on the 2020-2030 Federal Development Plan approved by the Federal Minister of Energy, improving the reliability of the electricity grid in the Walloon Brabant is necessary. The Braine-l’Alleud–Oisquercq project is in keeping with this goal.

  • texteBenefits to society

    Ensure grid reliability
    The new underground connection linking the Braine-l’Alleud and Oisquercq electrical substations will allow for greater reliability of the entire Walloon Brabant high-voltage electricity grid of which it will be part.

    Continue to contribute to the security of electricity supply
    The Elia grid is unique in that it is meshed. This means that each high voltage substation is connected to at least two connections. This feature enables Elia to continue contributing to security of supply even in the event of a fault or maintenance on one of the connections. With the construction of the Braine-l’Alleud–Oisquercq connection, this security of supply will therefore be enhanced.

  • texteThe route

    The proposed route takes into account local territorial considerations and respects the environment and surroundings in which the project will be carried out.

    The proposed route connects the electrical substation at Braine-l’Alleud to the one at Oisquercq by crossing the towns and municipalities of Braine-l’Alleud, Braine-Le-Château, Ittre and Tubize over a total length of approximately 12 km.

    Braine-l’Alleud - 2.7km / Braine-le-Château - 7.5km / Ittre - 600m / Tubize – 1.2km

    To find the exact location of the Braine-l'Alleud-Oisquercq line scheduled, please visit the Google map

  • environnementEnvironment

    As a socially responsible company, Elia is very committed to environmental issues. Elia actively contributes to the energy transition and pays particular attention to safeguarding biodiversity. We also develops our grid while establishing close collaborations with local authorities, local residents and all local partners involved in our infrastructure projects. 

    Elia pays particular attention to the proper execution of its projects and to the environment in which the works are carried out. Procedures are put in place for each stage, thus limiting the impact on fauna, flora, mobility and for local residents.

    As part of the Braine-l’Alleud–Oisquercq project, an Environmental Impact Assessment (EIA) and an Appropriate Assessment (AA) were carried out by an independent consulting engineering firm approved by Wallonia. These two documents study and evaluate the effects of the project on the environment and provide objective recommendations for this project.

  • Schedule
    • January - February 2022: Presentation to the municipalities prior to the planning permit application
    • May - June 2022: Submission of the permit application to the SPW
    • June 2022: Organisation of office hours in Braine-le-Château
    • June 2022: Examination of the file begins
    • Early 2023: Project coordination with the municipality of Braine-le-Château begins (outside the permit application procedure)
    • November 2022: Permission granted by the Delegated Official of the SPW
    • December 2022: Appeal lodged by the municipality of Braine-Le-Château
    • June 2023: Refusal of planning permission by the Minister of Spatial Planning
    • November 2023: Submission to the SPW of a new planning permit application
    • January 2024: Organisation of an office in Braine-Le-Château
    • April-May 2024: Theoretical delivery of the permit by the SPW
    • August 2024: Continuation of the works (permit application procedure)
    • March 2025: End of the works
  • docInteractive map
  • docDocuments



09 January 2024

Public consultation of the file

As part of the permit application procedure, once the file submitted by Elia has been deemed complete, the entire file may be consulted by the municipal authorities affected by the project, in accordance with the procedures below.


07 December 2023

Submission of permit application

In order to fulfil one of our main missions and develop a reliable electricity network, while contributing to the country's electricity supply security, Elia submitted a permit application at the end of October 2023 for the laying of a new 150kV underground line between Braine-l'Alleud and Oisquercq. 


02 June 2023

Laying of conduits on the RAVeL in progress

To align Elia's site zone with that of the RAVeL route being laid by the municipality of Braine-le-Château, conduits are being laid. 

Contact us

If you are affected by a project and want to ask us something, please feel free to contact us.
Our team would be happy to help.

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