Correction in 400 kV electrical line authorization Madrid: what changes

Key data

Landowners in Moraleja de Enmedio, Arroyomolinos and Móstoles should know that the project to expand the high-voltage electrical line at 400 kV continues without alterations. The Resolution of April 24, 2026 from the General Directorate of Energy Policy and Mines is limited to correcting material errors detected in the original authorization of March 10, 2026, without touching either the route or the substantive conditions.

For companies in the energy and infrastructure construction sectors, the message is clear: the project continues with full legal validity and the corrections have already been incorporated into the file.

What does this regulation establish?

The original resolution of March 10, 2026 granted Red Eléctrica de España, SAU two simultaneous authorizations:

• Prior administrative authorization for the transport capacity increase project.
• Administrative construction authorization for the same project.

The project consists of increasing the transport capacity of the double circuit overhead line at 400 kV that connects the Moraleja-Villaviciosa and Morata-Villaviciosa axes, with route modification in the section between supports 115 and 135, in the municipal terms of Moraleja de Enmedio, Arroyomolinos and Móstoles.

Additionally, the original resolution declared the public utility of the infrastructure, which in practical terms means that Red Eléctrica is enabled to initiate forced expropriation procedures on the private land necessary to execute the project.

The resolution of April 24, 2026 —published on May 13— only corrects material errors detected in the original text. It does not modify:

• The approved route between supports 115 and 135.
• The substantive conditions of the authorizations.
• The declaration of public utility.

Economic and operational impact

For most companies and executives, the direct impact of this correction is null: it is a technical-administrative adjustment that does not generate new obligations or additional costs.

However, there are two groups for whom the maintenance of the declaration of public utility has concrete economic consequences:

• Landowners in the affected section: The declaration of public utility activates Red Eléctrica's right to initiate forced expropriation proceedings. This means that landowners may be forced to cede their land in exchange for compensation that will be set by the Provincial Expropriation Board if there is no prior agreement. The value of that compensation depends on the cadastral and market valuation of each property.
• Companies in the energy and infrastructure construction sectors: The project continues its course without interruptions. Contractor or subcontractor companies participating in the execution must operate with the corrections already incorporated into the authorized file.

From an operational perspective, Red Eléctrica de España can continue with the pre-construction procedures —including negotiation with landowners and, where applicable, expropriation proceedings— without needing to wait for new resolutions.

Who does it affect?

• Red Eléctrica de España, SAU: Holder of the authorizations. Must operate with the corrected text of the file.
• Landowners in Moraleja de Enmedio: Affected by the route between supports 115 and 135 with declaration of public utility in force.
• Landowners in Arroyomolinos: Same as above.
• Landowners in Móstoles: Same as above.
• Electrical infrastructure construction and installation companies: Must know the updated status of the file to participate in tenders or subcontracting.
• Legal advisors specialized in expropriation and energy: Must update their files with the error correction resolution.

Practical example

A landowner of a rural property in the municipality of Arroyomolinos, located in the corridor of the route between supports 115 and 135, receives a notification from Red Eléctrica de España informing him of the start of the forced expropriation proceeding.

Given that the declaration of public utility is in force and has not been modified by the error correction of April 24, 2026, Red Eléctrica has full legal authorization to continue that procedure. The landowner has the right to:

• Negotiate a price agreement with Red Eléctrica before the formal proceeding is initiated.
• Challenge the proposed valuation if he considers it does not reflect the real market value of his property.
• Resort to the Provincial Expropriation Board if there is no agreement in the mutual agreement phase.

The error correction does not open or close new deadlines for landowners: the procedure follows the calendar set from the original authorization of March 10, 2026.

What should companies do now?

1. Landowners in Moraleja de Enmedio, Arroyomolinos or Móstoles: Verify if their properties are included in the route between supports 115 and 135. If they have received or expect to receive expropriation notification, consult with a lawyer specialized in expropriation law before signing any price agreement.
2. Construction and installation companies: Update their internal files with the error correction resolution (BOE of May 13, 2026) to ensure they work with the current and corrected text of the authorization.
3. Legal advisors and energy consultants: Incorporate the correction resolution into the project file and communicate to their clients that there are no substantive changes in the authorization conditions or in the route.
4. Energy sector companies with interest in the project: Confirm with Red Eléctrica de España the updated execution schedule, as the project continues its course without interruptions after the correction.