Key data
| Regulation | Resolution of July 13, 2026, from the General Directorate of Energy Policy and Mines |
|---|---|
| BOE Publication | August 3, 2026 |
| Entry into force | August 3, 2026 |
| Authorization holder | Red Eléctrica de España, SAU |
| Authorized installation | 250 MVA synchronous compensator at Santa María de Grado substation (400 kV) |
| Location | Grado, Asturias |
| Regulatory framework | Transmission Network Development Plan 2021-2026 (approved by the Council of Ministers in July 2025) |
| Category | Energy |
| Appeal | Appeal to the State Secretariat for Energy within one month |
The electrical transmission network in Asturias gains a key piece of stability: a 250 MVA synchronous compensator that will be installed at the Santa María de Grado substation, operating in the 400 kV yard. The Resolution of July 13, 2026, from the General Directorate of Energy Policy and Mines, published in the BOE on August 3, 2026, grants Red Eléctrica de España, SAU, both prior administrative authorization and administrative construction authorization for this project.
The project is not an isolated decision: it is included in the Transmission Network Development Plan 2021-2026, approved by the Council of Ministers in July 2025, which defines priority investments to ensure the security and resilience of the Spanish electrical system.
What does this regulation establish?
The resolution grants two simultaneous authorizations to Red Eléctrica de España, SAU, for the expansion of the Santa María de Grado substation:
- Prior administrative authorization: enables the project from the perspective of energy planning.
- Administrative construction authorization: allows physical execution of the work and installation.
The specific object of the authorization is the installation of a 250 MVA synchronous compensator and its associated position in the 400 kV yard of the substation. A synchronous compensator is a rotating electrical machine that provides inertia to the system and regulates voltage, contributing to network stability, especially in contexts of high renewable energy penetration.
The most relevant procedural aspects of this resolution are:
| Aspect | Detail |
|---|---|
| Nature of processing | Urgent |
| Timeline reduction | By half compared to ordinary procedure |
| Environmental assessment | Exempted, as it is located at an already operational substation |
| Additional conditions | Compliance with specific technical conditions |
| Pending authorizations | Roads and aeronautical easements |
| Available appeal | Appeal to the State Secretariat for Energy, one-month deadline |
The environmental assessment exemption is relevant from a timeline perspective: since it is an expansion within an already operational substation, the environmental impact procedure is not triggered, which significantly accelerates execution.
Economic and operational impact
This authorization has direct impact on electrical system operation in the northwestern peninsula. Synchronous compensators are strategic assets for the energy transition: they provide synthetic inertia and voltage support that renewable installations (photovoltaic and wind) do not provide natively.
From an operational perspective, the most relevant effects are:
- Greater network resilience in Asturias: the Santa María de Grado substation strengthens its response capacity to disturbances in the 400 kV network.
- Reduced instability risks: especially relevant in scenarios of high renewable generation with low system inertia.
- Accelerated processing: the reduction of timelines by half means that the installation can be executed in a much shorter timeframe than usual for infrastructure of this magnitude.
- No additional environmental cost: the environmental assessment exemption eliminates a phase that typically adds months to the process.
Red Eléctrica must, however, obtain additional authorizations regarding roads and aeronautical easements before starting construction, which introduces external constraints to the process.
Who does it affect?
- Red Eléctrica de España, SAU: authorization holder and responsible for executing the installation, complying with technical conditions and obtaining pending sectoral authorizations.
- Electrical system operators in Asturias: benefit from a more robust transmission network with greater voltage support capacity.
- Renewable generators connected to the 400 kV network in the northwest: greater network stability facilitates integration of new renewable capacity.
- Large industrial consumers in Asturias: improved network resilience reduces the risk of supply interruptions at the Santa María de Grado node.
- Sectoral administrations: competent bodies in roads and aeronautical easements matters, which must issue the required additional authorizations.
Practical example
A wind farm connected to the 400 kV network in the Grado area (Asturias) operates in a system with low inertia when renewable generation is dominant. Under those conditions, a network disturbance can cause sharp frequency or voltage variations that force installations to disconnect.
With the installation of the 250 MVA synchronous compensator at Santa María de Grado, the substation provides mechanical inertia and voltage support continuously. The practical result for that wind farm is a more stable network, lower risk of involuntary disconnections and, consequently, greater generation availability and lower exposure to penalties for non-compliance with connection requirements.
For Red Eléctrica, urgent processing with timelines reduced by half means that, instead of waiting for the full ordinary authorization period, the process has been significantly shortened, allowing progress toward the construction phase in a timeframe more aligned with the 2021-2026 Development Plan calendar.
What should companies do now?
- Red Eléctrica de España: verify compliance with all specific technical conditions established in the resolution before starting construction.
- Red Eléctrica de España: initiate procedures to obtain additional authorizations regarding roads and aeronautical easements, which are necessary conditions for executing the work.
- Operators and generators connected to the 400 kV network in Asturias: review whether the new installation affects their connection conditions or current network studies.
- Any interested party: if you believe the resolution affects your rights or legitimate interests, the deadline to file an appeal to the State Secretariat for Energy is one month from publication (August 3, 2026).
- Large industrial consumers in Asturias: assess the positive impact on supply quality at the Santa María de Grado node for operational planning.
Frequently asked questions
What is a synchronous compensator and what is its purpose at a 400 kV substation?
A synchronous compensator is a rotating electrical machine that, when connected to the network, provides mechanical inertia and regulates voltage without generating or consuming significant active power. At a 400 kV substation like Santa María de Grado, its main function is to stabilize the network against disturbances and compensate for the lack of inertia that characterizes systems with high renewable energy penetration.
Why was it processed as urgent and what does the timeline reduction by half mean?
The resolution recognizes the urgent nature of the project, which allows administrative authorization timelines to be reduced by half compared to the ordinary procedure. This means Red Eléctrica can advance toward the construction phase in a significantly shorter timeframe than usual for infrastructure of this magnitude, aligned with the 2021-2026 Transmission Network Development Plan calendar.
Why is this installation exempt from environmental assessment?
The environmental impact assessment exemption applies because the installation is located within an already operational substation (Santa María de Grado, Grado, Asturias). Since it does not involve new land occupation or affect new areas, the ordinary environmental assessment procedure is not triggered, eliminating a phase that typically adds months to the authorization process.
What additional authorizations does Red Eléctrica need before construction?
In addition to the prior administrative and construction authorizations already granted, Red Eléctrica must obtain additional authorizations regarding roads and aeronautical easements. These sectoral authorizations are necessary conditions for physically executing the work.
How and within what timeframe can this resolution be appealed?
The resolution can be appealed to the State Secretariat for Energy within one month from its publication in the BOE (August 3, 2026). Any party that believes the resolution affects their rights or legitimate interests can file this appeal within that timeframe.
Official source
Consult complete regulation at official source
Notice: This article is for informational purposes only and does not constitute legal advice. For specific decisions, consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-16912