Saguntum 400 kV Substation Approved: What It Means for Valencian Industry

Key data

Industrial companies in Sagunto and the Mediterranean corridor face a structural improvement in their electrical infrastructure. The General Directorate of Quality and Environmental Assessment has issued a favorable environmental impact assessment (EIA) for two electrical infrastructure projects in Sagunto: the new Saguntum 400 kV substation and the overhead electrical energy transport line at 400 kV, double circuit, Gaussa-Saguntum, both in the municipality of Sagunto (Valencia).

This approval, contained in the Resolution of May 4, 2026 (BOE-A-2026-10729), is the essential prerequisite for Red Eléctrica or the competent operator to begin construction work. Without it, no construction activity is legally possible.

What does this regulation establish?

The resolution issues a favorable EIA for the following two projects:

The EIA is not a construction authorization in itself, but rather the mandatory prior environmental assessment that enables the promoter to continue with administrative procedures and subsequently execute the works. Without a favorable EIA, projects cannot move forward.

The resolution establishes mandatory environmental conditions during two phases:

• Construction phase: measures on fauna, vegetation and landscape to minimize the impact of works.
• Operation phase: conditions for monitoring and environmental maintenance once the infrastructures are in service.

Compliance with these conditions is not optional: the responsible operator must demonstrate it to the competent administration throughout the entire project lifecycle.

Economic and operational impact

The approval of this EIA has direct consequences in several areas:

• Unlocking investments in energy infrastructure: The resolution removes the main administrative-environmental obstacle to executing the works. This activates relevant investments in electrical infrastructure in the province of Valencia, whose specific amount is not detailed in the published resolution.
• Strengthening the Mediterranean corridor: The new substation and the 400 kV line increase electrical transport capacity in an area of high industrial demand. For companies in the area, this can translate into greater power availability, lower risk of supply restrictions, and better conditions for expanding facilities or connecting new loads.
• Environmental compliance costs for the operator: Red Eléctrica or the competent operator assumes the costs derived from the environmental conditions imposed by the EIA (measures on fauna, vegetation and landscape). These costs are part of the project budget, although their amount is not published in the resolution.
• Impact on local administrations: The municipalities and administrations of Sagunto and Valencia must coordinate with the operator on compliance with environmental conditions and the urban planning permits necessary for executing the works.

Who does it affect?

• Red Eléctrica and electrical operators: Directly responsible for executing the projects and complying with the EIA environmental conditions.
• Industrial companies in Sagunto and the Mediterranean corridor: Beneficiaries of the strengthening of electrical infrastructure; can anticipate improvements in the quality and capacity of supply.
• Large industrial consumers in the province of Valencia: Greater 400 kV transport capacity can facilitate new connections or increases in contracted power.
• Local administrations in Sagunto and Valencia: Involved in coordinating permits and monitoring environmental compliance during works.
• Construction companies and engineering services: The environmental approval opens the bidding and works contracting process.

Practical example

An industrial company in the Sagunto industrial park that currently has limitations on its contracted power due to transport network restrictions can directly benefit from this infrastructure. Once the Saguntum 400 kV substation and the Gaussa-Saguntum line are executed, the greater transport network capacity in the area may allow it to request from its distributor a power increase that was previously not viable due to lack of capacity in the high-voltage network.

Similarly, Red Eléctrica, as the responsible operator, must demonstrate to the General Directorate of Quality and Environmental Assessment compliance with all measures on fauna, vegetation and landscape established in the EIA, both during the works phase and once the infrastructure is operational. Non-compliance with these conditions could halt the works or generate administrative liabilities.

What should companies do now?

1. Electrical operators (Red Eléctrica): Review the EIA environmental conditions and integrate them into the construction project before starting any field work. Non-compliance can halt the works.
2. Industrial companies in Sagunto and the Mediterranean corridor: Contact your distributor or Red Eléctrica to assess whether the new infrastructure allows you to increase your contracted power or improve the conditions of your supply point.
3. Construction and engineering companies: Be alert to the bidding process that will open following this environmental approval, as the favorable EIA is the step prior to works contracting.
4. Local administrations in Sagunto and Valencia: Coordinate with the promoter on urban planning permits and monitoring of environmental compliance during the construction phase.
5. Any company affected by the works: Identify whether the overhead line routes or the substation location affect your facilities or land, and contact the operator to manage possible impacts.