Moreruela 400 KV Substation: new environmental conditions in Zamora

Key data

The promoter of the new Moreruela 400 KV substation in Zamora has new environmental obligations to comply with. The General Directorate of Quality and Environmental Assessment published on 12 May 2026 the Resolution of 30 April 2026 (BOE-A-2026-10318), which modifies the conditions of the environmental impact statement (EIA) approved for this high-voltage electrical infrastructure project.

This is not a regulation of general application: it affects exclusively the project of the new Moreruela 400 KV substation and its 400 KV double-circuit electrical transmission line, located in Moreruela de los Infanzones (Zamora), in the section of the Grijota-Villarino 2 line. For the promoter and construction companies involved, ignoring this update poses a risk of regulatory non-compliance with direct consequences on project execution.

What does this regulation establish?

The resolution modifies the conditions of the environmental impact statement previously approved for this project. According to available data, the modifications may affect the following areas:

• Execution timelines: possible adjustments to work schedules or project phases.
• Corrective measures: update of the measures that the promoter must apply to minimize environmental impact during construction and operation.
• Environmental technical conditions: new technical requirements that may affect the design or operational procedures of the infrastructure.

The project to which this resolution applies is the new Moreruela 400 KV substation and the 400 KV double-circuit electrical energy transmission line, with entry and exit at said substation, corresponding to the Grijota-Villarino 2 line, in Moreruela de los Infanzones (Zamora). This infrastructure is part of the high-voltage electrical transmission network of the national electrical system.

The exact detail of each modified condition is contained in the full text of the resolution, available in the BOE (BOE-A-2026-10318).

Economic and operational impact

For the promoter and construction companies of the project, this modification of the EIA can translate into concrete economic and operational consequences:

• Additional costs: adaptation to the new environmental conditions may require investment in additional corrective measures, redesign of project elements, or hiring specialized technical services.
• Changes in project design: if the new environmental technical conditions affect the engineering of the substation or the transmission line, it will be necessary to update the executive projects and obtain the corresponding validations.
• Impact on timelines: adjustments to execution timelines may affect the planning of contracts, supplies, and human resources assigned to the work.
• Risk of paralysis: non-compliance with the EIA conditions may result in project paralysis by the competent administration, with the resulting economic impact.

No specific economic figures are available in the data from this resolution. The actual impact will depend on the specific scope of each modified condition, which must be analyzed in the full text of the resolution.

Who does it affect?

This resolution has a very specific scope of application. It directly affects:

• The project promoter of the new Moreruela 400 KV substation and electrical transmission line in Moreruela de los Infanzones (Zamora).
• Construction companies contracted for the execution of the substation and 400 KV transmission line works.
• Technical and environmental managers of the project, who must ensure compliance with the new conditions during construction and operation.
• Energy sector companies involved in the management or operation of this infrastructure of the national electrical transmission network.

It does not affect companies unrelated to this specific project, although it may be relevant as a precedent for other high-voltage electrical infrastructure projects subject to environmental impact assessment in Spain.

Practical example

Imagine that a construction company awarded the works of the Moreruela 400 KV substation has planned an earthmoving phase for the third quarter of 2026, with a closed schedule and subcontracts already committed.

If the modification of the EIA introduces new conditions on the timing of execution of certain works (for example, restrictions due to nesting of protected birds in the area) or requires additional corrective measures not foreseen in the original project (such as acoustic screens, runoff controls, or specific revegetation), the company must:

• Review and update the work plan to adapt it to the new timelines or restrictions.
• Budget the additional corrective measures and negotiate their coverage with the promoter if they were not included in the original contract.
• Coordinate with the project's environmental manager the implementation and documentation of the new measures before continuing with execution.

Failing to act in time may result in work paralysis by the administration, with the costs of machinery immobilization, personnel, and contracts that this entails.

What should companies do now?

1. Download and read the full text of the resolution (BOE-A-2026-10318, published on 12 May 2026) to identify exactly which EIA conditions have been modified.
2. Compare the new conditions with the previous ones from the original EIA to determine the actual scope of changes and their impact on the project under execution or planned.
3. Evaluate the economic impact and timelines of each modification: costs of new corrective measures, possible design changes, and adjustments to the work schedule.
4. Update the execution plan and technical project documents to reflect the new mandatory environmental conditions.