Key data
| Regulation | Resolution of October 23, 2026, from the General Directorate of Energy Policy and Mines |
|---|---|
| Publication | November 9, 2026 |
| Entry into force | November 9, 2026 |
| Promoter | Eólica Sierra de Ávila, SL |
| Photovoltaic installation | Cabeza Mesá — 27.3 MW installed capacity |
| Hybridized wind farm | Cabeza Mesá — 29.6 MW installed capacity |
| Municipalities | Padiernos and Niharra (Ávila) |
| Connection point | Lastras 400 kV Substation (Red Eléctrica) |
| Environmental Impact Statement | Favorable — August 2026 |
| Project processed jointly | Colladillo — 22.05 MW (nearby photovoltaic) |
| Category | Energy |
Eólica Sierra de Ávila, SL takes a decisive step in optimizing its renewable portfolio in Ávila: the General Directorate of Energy Policy and Mines grants it prior administrative authorization to build the Cabeza Mesá photovoltaic plant, of 27.3 MW, and hybridize it with the homonymous wind farm of 29.6 MW already registered in the electrical installations registry. The resolution was published in the BOE on November 9, 2026.
Hybridization allows both technologies—solar and wind—to share the same evacuation infrastructure, with connection to the Lastras 400 kV substation of Red Eléctrica. This strategy reduces connection costs and streamlines procedures by leveraging the already authorized infrastructure of the wind farm.
What does this regulation establish?
The resolution grants prior administrative authorization—the first of three authorizations required in the process of enabling electrical installations—for the Cabeza Mesá photovoltaic plant and its evacuation infrastructure, in order to hybridize it with the wind farm of the same name.
The mandatory conditions that the promoter must comply with are grouped into four blocks:
| Block | Agency / Source | Main content |
|---|---|---|
| Environmental Impact Statement (EIS) | Competent Ministry — August 2026 | Preventive, corrective and compensatory measures mandatory during construction and operation |
| Program of compensatory measures | Junta de Castilla y León | Must be developed and approved before obtaining operating authorization |
| Hydrological conditions | Duero River Basin Authority | Specific restrictions linked to the Duero basin in the scope of the installation |
| Anti-glare measures | Ministry of Transport / state roads | Obligation to install measures that prevent glare on adjacent state roads |
Additionally, the processing of this project was accumulated with that of the Colladillo photovoltaic project (22.05 MW), a nearby installation, which streamlined the joint administrative procedure.
Economic and operational impact
Solar-wind hybridization on existing evacuation infrastructure is one of the most cost-efficient strategies for renewable promoters: it avoids duplicating investment in evacuation lines and substations, which typically represent between 15% and 25% of the total cost of a generation project.
In operational terms, the project involves the following requirements before it can operate:
- Develop the program of compensatory measures and obtain its approval by the Junta de Castilla y León — a suspensive condition for operating authorization.
- Fully comply with the EIS of August 2026, with its preventive, corrective and compensatory measures during the construction phase and the operation phase.
- Implement the conditions of the Duero River Basin Authority in the construction design.
- Install anti-glare systems on the fronts of the plant facing state roads.
Non-compliance with any of these conditions blocks the obtaining of operating authorization, preventing the commercial operation of the installation.
Who does it affect?
- Eólica Sierra de Ávila, SL — direct promoter, authorization holder and responsible for compliance with all conditions.
- Municipalities of Padiernos and Niharra (Ávila) — territory of implementation of the photovoltaic plant and its evacuation infrastructure.
- Junta de Castilla y León — must approve the program of compensatory measures before the promoter can request operating authorization.
- Duero River Basin Authority — its conditions are mandatory during the construction phase.
- Red Eléctrica de España — manager of the Lastras 400 kV substation, connection point for evacuation.
- Promoters of similar renewable projects — this case sets procedural precedent for similar projects in Castilla y León.
Practical example
Eólica Sierra de Ávila, SL has its Cabeza Mesá wind farm of 29.6 MW in operation with connection to the Lastras 400 kV substation. Instead of requesting a new access point and connection for the photovoltaic—a process that can take years and cost tens of millions of euros in infrastructure—the company leverages the evacuation capacity already assigned to the wind farm to integrate the 27.3 MW photovoltaic.
The result is a hybrid installation of 56.9 MW total that shares evacuation infrastructure. However, before turning on the first panel, the company must obtain approval of the program of compensatory measures from the Junta de Castilla y León. If that procedure is delayed, operating authorization—and therefore the start of commercial generation and associated revenues—remains blocked.
What should companies do now?
- Develop the program of compensatory measures and submit it to the Junta de Castilla y León as soon as possible: its approval is a prior and unavoidable condition for requesting operating authorization.
- Review and apply all conditions of the EIS of August 2026 in the construction executive project, distinguishing preventive measures (construction phase) from corrective and compensatory measures (operation phase).
- Coordinate with the Duero River Basin Authority the integration of its conditions in the construction project before the start of works.
- Design and incorporate the anti-glare measures required by the Ministry of Transport on the fronts of the plant near state roads.
- Manage coordination with Red Eléctrica for connection to the Lastras 400 kV substation and ensure that the shared evacuation infrastructure meets the technical requirements of hybridization.
- Promoters of similar projects should analyze this case as a procedural reference for hybridizations in Castilla y León, especially regarding accumulated processing with nearby projects (such as Colladillo, 22.05 MW).
Frequently asked questions
What is prior administrative authorization and what is missing for the plant to operate?
Prior administrative authorization is the first step in the process of enabling electrical installations. After it, the promoter must obtain administrative construction authorization and, finally, operating authorization. The latter is conditioned, among other requirements, to the Junta de Castilla y León approving the program of compensatory measures required by the EIS of August 2026.
What is the total capacity of the Cabeza Mesá hybrid project?
The hybrid installation totals 56.9 MW: 29.6 MW from the wind farm already registered in the electrical installations registry and 27.3 MW from the new photovoltaic plant authorized by this resolution. Both installations share evacuation infrastructure with connection to the Lastras 400 kV substation of Red Eléctrica.
What environmental conditions must the promoter comply with?
The Environmental Impact Statement, issued favorably in August 2026, imposes preventive, corrective and compensatory measures that are mandatory. Additionally, the promoter must comply with the specific conditions of the Duero River Basin Authority and the anti-glare measures required for adjacent state roads.
Why was it processed jointly with the Colladillo project?
The Colladillo photovoltaic project (22.05 MW), located in a nearby area, was processed jointly with Cabeza Mesá. This joint processing is an administrative mechanism that streamlines procedures when several projects share territorial scope or evacuation infrastructure, reducing resolution timeframes for both cases.
What happens if the program of compensatory measures is not approved?
Without approval of the program of compensatory measures by the Junta de Castilla y León, the promoter cannot obtain operating authorization. This blocks the start of commercial generation of the photovoltaic plant, preventing the installation from producing electricity and generating revenue, regardless of whether construction is completed.
Official source
Consult complete regulation in 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-2026-23497
