Key data
| Regulation | Resolution of August 28, 2026, from the General Directorate of Quality and Environmental Assessment — Environmental Impact Declaration for FV Colladillo and FV Cabeza de Mesá solar parks |
|---|---|
| BOE Publication | September 9, 2026 |
| Effective date | September 9, 2026 |
| Developer | Eólica Sierra de Ávila, SL |
| Location | Municipalities of Padiernos and Niharra (province of Ávila) |
| Approved solar capacity | 22.05 MW (Colladillo) + 27.3 MW (Cabeza de Mesá) = 49.35 MW total |
| Existing wind capacity hybridized | 30.6 MW (Colladillo) + 29.6 MW (Cabeza de Mesá) = 60.2 MW total |
| Evacuation | Underground lines of 30 kV to El Rincón substation (new construction) |
| Category | Energy / Environment |
| BOE Reference | BOE-A-2026-18893 |
Two photovoltaic solar parks in the province of Ávila have just overcome the main regulatory hurdle: the Environmental Impact Declaration (EIA). The Resolution of August 28, 2026, published in the BOE on September 9, 2026, grants environmental approval to the FV Colladillo (22.05 MW) and FV Cabeza de Mesá (27.3 MW) parks, promoted by Eólica Sierra de Ávila, SL.
The strategic key to this project is hybridization: both solar installations will share evacuation infrastructure with the Colladillo (30.6 MW) and Cabeza de Mesá (29.6 MW) wind parks, already in operation. This optimizes network investment and reduces territorial impact by not requiring new high-voltage overhead lines.
What does this regulation establish?
The EIA is the administrative document that certifies that an energy generation project meets the environmental requirements established by Spanish legislation. Without it, the administrative authorization that allows construction and operation of the facility cannot be processed.
In this case, the resolution approves the project with conditions. During processing, the project was significantly reconfigured to reduce its environmental impact:
- The fenced area was reduced by more than 17 hectares compared to the original design.
- Enclosures affecting local bird populations were eliminated, including areas near Iberian imperial eagle nests.
- Electrical evacuation will be carried out through underground 30 kV lines to the El Rincón substation, new construction, avoiding overhead lines that pose greater risk to birds.
The conditions that the developer must comply with are structured around three main axes:
| Condition axis | Detail |
|---|---|
| Environmental monitoring | Continuous monitoring plans during construction and operation |
| Biodiversity | Specific compensation measures for impact on the natural environment |
| Sensitive fauna | Monitoring plans for bats and birds, with special attention to the Iberian imperial eagle |
Economic and operational impact
For the developer, Eólica Sierra de Ávila, SL, this favorable EIA unlocks the next phase of the project: requesting administrative authorization from the Ministry for Ecological Transition and Demographic Challenge (or the Junta de Castilla y León, depending on competencies).
The hybridization strategy has a direct economic impact highly relevant to the sector:
- Optimization of evacuation infrastructure: by sharing the substation and lines with existing wind parks, investment duplication in grid connection is avoided, one of the highest costs in renewable projects.
- Greater utilization factor of the connection point: the complementarity between solar generation (daytime) and wind (more nocturnal and during wind periods) allows better use of contracted evacuation capacity.
- Reduction of territorial impact: the elimination of more than 17 hectares of fencing and the removal of overhead lines reduces expropriation and easement costs, while also expediting processing with municipalities and property owner associations.
For other sector developers, this case is a reference: the project reconfiguration during environmental processing—reducing area and eliminating impacts on protected fauna—was decisive in obtaining the favorable EIA.
Who does it affect?
- Eólica Sierra de Ávila, SL: direct developer, which must now begin the administrative authorization phase with the EIA in hand.
- Municipalities of Padiernos and Niharra (Ávila): territories where the facilities will be located; their town halls will participate in urban planning and licensing processing.
- Developers of solar-wind hybridization projects in Spain: this case establishes precedents on the environmental conditions required and the feasibility of reconfiguring projects during processing.
- Renewable sector companies with projects in processing in Castilla y León: must be aware of the criteria applied regarding protected bird species (especially Iberian imperial eagle) and bats.
- Environmental and engineering consultancies: that advise on drafting environmental impact studies for photovoltaic projects.
- Investors and renewable infrastructure funds: that evaluate the regulatory risk of projects in environmental processing phase.
Practical example
Imagine a developer company has a 25 MW solar project in processing in Castilla y León, in an area with Iberian imperial eagle presence. The case of the Colladillo and Cabeza de Mesá parks shows that the General Directorate of Quality and Environmental Assessment required—and the developer accepted—eliminating project enclosures located near nests of this protected species, reducing the fenced area by more than 17 hectares.
The practical lesson: if the environmental impact study detects impact on protected fauna, anticipating project reconfiguration before the public consultation phase reduces the risk of an unfavorable or more burdensome conditional EIA. In this case, proactive reconfiguration was the factor that allowed obtaining environmental approval and advancing toward administrative authorization.
What should companies do now?
- If you are the developer (Eólica Sierra de Ávila, SL): immediately begin administrative authorization processing with the competent authority, providing the EIA as an enabling document. Design the bat and bird monitoring plans required by the resolution before construction begins.
- If you have solar projects in processing in areas with protected fauna: review whether your project has enclosures or routes that could affect nests or corridors of species like the Iberian imperial eagle. Anticipated reconfiguration could be the difference between a favorable EIA and a halt.
- If you evaluate solar-wind hybridization projects: analyze this case as a reference for the environmental conditions that the General Directorate of Quality and Environmental Assessment applies in Castilla y León. Incorporate into your due diligence the costs of monitoring plans and biodiversity compensation measures.
- If you advise renewable investors: update your regulatory risk models to include the possibility of project reconfiguration during environmental processing, with the impact on timelines and costs that this entails.
- If you are an environmental consultant: document the criteria applied in this case (fencing reduction, elimination of bird impacts, use of underground lines) to apply them in future environmental impact studies in similar areas.
Frequently asked questions
What is an EIA and why is it essential for a solar park?
The Environmental Impact Declaration (EIA) is the administrative act by which the competent environmental authority certifies that a project meets the legally required environmental standards. In the case of FV Colladillo and FV Cabeza de Mesá solar parks, the EIA issued on August 28, 2026 is the essential prerequisite for Eólica Sierra de Ávila, SL to request the administrative authorization that allows construction and operation of the facilities. Without a favorable EIA, the project cannot advance.
What capacity do the approved solar parks in Ávila have and which wind farms do they hybridize with?
The approved solar parks are FV Colladillo, with 22.05 MW, and FV Cabeza de Mesá, with 27.3 MW, totaling 49.35 MW of new photovoltaic capacity. They hybridize respectively with the Colladillo (30.6 MW) and Cabeza de Mesá (29.6 MW) wind parks, which are already in operation, sharing evacuation infrastructure through 30 kV underground lines to the El Rincón substation.
Why was the project reconfigured during environmental processing?
During processing, it was detected that some enclosures in the original design affected local bird populations, including areas near Iberian imperial eagle nests, a protected species. To obtain the favorable EIA, the developer reconfigured the project by eliminating those enclosures and reducing the fenced area by more than 17 hectares. This proactive adaptation was decisive for the General Directorate of Quality and Environmental Assessment to issue a favorable resolution.
What environmental conditions must the developer comply with after the EIA?
The developer, Eólica Sierra de Ávila, SL, must comply with three types of conditions: (1) environmental monitoring plans during construction and operation; (2) biodiversity compensation measures for impact on the natural environment; and (3) monitoring plans for bats and birds, with special attention to sensitive species present in the area. These conditions must be designed and implemented before and during facility operation.
What are the advantages of solar-wind hybridization from a regulatory and economic perspective?
Hybridization allows sharing evacuation infrastructure (lines and substation) between solar and wind parks, which reduces investment in grid connection and simplifies processing. In this project, evacuation is carried out through 30 kV underground lines to the El Rincón substation, new construction, avoiding overhead lines that generate greater environmental impact and more opposition in processing. Additionally, the complementarity between solar and wind generation optimizes the use of the contracted connection point.
Official source
View complete regulation at official source (BOE-A-2026-18893)
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-2026-18893
