Key data
| Regulation | Resolution of June 5, 2026, from the General Directorate of Quality and Environmental Assessment — Environmental Impact Statement of the project "FV Aceca Photovoltaic Solar Park" |
|---|---|
| Publication | June 20, 2026 |
| Entry into force | June 20, 2026 |
| Developer | Iberdrola Generación Térmica, SL |
| Installed capacity | 347.51 MW nominal |
| Surface area | 531 ha divided into three sectors |
| Photovoltaic modules | 726,180 bifacial modules |
| Affected municipalities | Toledo, Almonacid de Toledo and Mocejón |
| Hybridization | Aceca combined cycle power plant (391.52 MW) |
| Evacuation infrastructure | Three substations at 220 kV + overhead and underground lines |
| Category | Energy / Environmental Assessment |
| Year | 2026 |
Iberdrola Generación Térmica, SL can proceed with the execution of the FV Aceca photovoltaic solar park following the approval of its Environmental Impact Statement, published in the BOE of June 20, 2026. The resolution, signed by the General Directorate of Quality and Environmental Assessment, is not a blank check: it includes binding conditions that affect the project timeline and cost.
The project will be hybridized with the Aceca combined cycle power plant, with 391.52 MW, making it one of the largest renewable-gas hybridization projects in Spain. For the sector, this EIA is a reference for the environmental requirements that the Administration demands for installations of this magnitude.
What does this regulation establish?
The resolution formulates the EIA for the FV Aceca solar park and sets the conditions under which the project can be executed. These are the key technical and environmental elements it includes:
| Element | Detail |
|---|---|
| Park configuration | Three sectors within the municipalities of Toledo, Almonacid de Toledo and Mocejón |
| Technology | 726,180 bifacial photovoltaic modules |
| Electrical evacuation | Three substations at 220 kV, with overhead and underground lines |
| Hybridization | Integration with the Aceca combined cycle power plant (391.52 MW) |
| Identified deficiencies | Technical analysis identified deficiencies in the alternatives study presented by the developer |
| Protected fauna | Additional reports were required on Iberian imperial eagle and steppe birds |
| Environmental conditions | Binding for project execution; without their compliance, the project cannot be executed |
The EIA does not approve the project unconditionally. The Administration identified deficiencies in the alternatives study presented by Iberdrola and required additional reports on protected species, particularly the Iberian imperial eagle and various steppe birds present in the project's area of influence.
Economic and operational impact
For Iberdrola Generación Térmica, the approval of the EIA unlocks the next phase of the project, but the binding environmental conditions have direct operational and economic implications:
- Additional environmental compliance costs: Binding conditions may require corrective measures, wildlife monitoring plans, modifications to line routing, or restricted work schedules during breeding seasons of protected species.
- Risk of work stoppage: Non-compliance with any of the EIA conditions may result in precautionary work stoppage by the Administration.
- Complex evacuation infrastructure: Three substations at 220 kV with overhead and underground lines involve significant evacuation infrastructure investment, also subject to the environmental conditions of the resolution.
- Hybridization as competitive advantage: Integration with the Aceca combined cycle power plant (391.52 MW) allows optimization of generation and evacuation capacity, reducing costs per installed MW compared to a standalone solar project.
- Sectoral precedent: Requirements on protected fauna and the alternatives study set the level of detail that the Administration expects in projects of this scale, with direct impact on processing costs for similar future projects.
Who does it affect?
- Iberdrola Generación Térmica, SL: Direct developer. Must comply with all binding environmental conditions before and during execution.
- Local administrations of Toledo, Almonacid de Toledo and Mocejón: Municipalities where the project is located; must coordinate urban planning and land use permits with the EIA conditions.
- Solar energy developers with large-scale projects in Spain: This EIA establishes a precedent on the level of environmental requirement for photovoltaic parks exceeding 50 MW, especially in areas with protected fauna.
- Engineering and environmental consulting companies: The identified deficiencies in the alternatives study reinforce the need for exhaustive environmental studies from the design phase.
- Investors and financiers of renewable projects: The binding conditions of the EIA are a risk factor that must be reflected in the project's financial models.
Practical example
A solar developer processing a photovoltaic park of more than 100 MW in Castilla-La Mancha, in an area with the presence of Iberian imperial eagle or great bustard, should anticipate that the General Directorate of Quality and Environmental Assessment will require — as it has done with Iberdrola in FV Aceca — specific reports on these species before formulating the EIA.
If the environmental impact study presented does not include sufficient analysis of location or routing alternatives, the Administration may request additional documentation, extending the evaluation process by several months. In the case of FV Aceca, this requirement was already identified as a deficiency during the procedure. For a 347.51 MW project with three substations at 220 kV, any delay in the EIA has a direct opportunity cost on startup and generation revenue.
What should companies do now?
- Review the binding environmental conditions of the EIA: Iberdrola Generación Térmica must identify each condition imposed in the resolution and assign internal responsible parties for their monitoring and compliance.
- Update the work plan with environmental restrictions: Conditions on protected fauna (imperial eagle, steppe birds) may imply prohibited time windows for certain construction activities. This must be reflected in the schedule.
- Strengthen alternatives studies in future projects: The detection of deficiencies in this case is a clear signal: developers must invest in more complete alternatives studies from the start to avoid requirements that extend processing.
- Coordinate with the municipalities of Toledo, Almonacid de Toledo and Mocejón: Local administrations must align their urban planning licenses with the EIA conditions to avoid incompatibilities that halt work.
- Update the project's financial models: Investors and financiers must incorporate environmental compliance costs and the risk of delays derived from binding conditions in their projections.
- Consult the complete resolution in the BOE: Binding conditions are mandatory from June 20, 2026. Any start of work without verifying their compliance exposes the developer to administrative stoppage.
Frequently asked questions
What is an Environmental Impact Statement and what does it imply for the FV Aceca project?
The EIA is the administrative act that concludes the environmental impact assessment procedure. In the case of the FV Aceca solar park, formulated on June 5, 2026 and published on June 20, it establishes the binding environmental conditions under which Iberdrola Generación Térmica can execute the 347.51 MW project in Toledo, Almonacid de Toledo and Mocejón. Without complying with these conditions, the project cannot be legally executed.
What environmental conditions have been imposed on Iberdrola's FV Aceca solar park?
The resolution establishes binding environmental conditions for project execution. Among the most relevant aspects identified during the procedure: technical analysis identified deficiencies in the alternatives study presented by Iberdrola, and additional specific reports were required on protected fauna, specifically on the Iberian imperial eagle and steppe birds present in the project's area of influence.
Which municipalities in Toledo are affected by the FV Aceca solar park?
The project occupies 531 ha distributed in three sectors in the municipal areas of Toledo, Almonacid de Toledo and Mocejón. The evacuation infrastructure includes three substations at 220 kV with overhead and underground lines that also run through these municipalities.
What does the hybridization of the solar park with the Aceca combined cycle power plant consist of?
The FV Aceca solar park, with 347.51 MW of nominal capacity and 726,180 bifacial modules, will be integrated with the Aceca combined cycle generation plant, which has a capacity of 391.52 MW. Hybridization allows combining photovoltaic solar generation with gas generation, optimizing existing evacuation capacity and improving supply stability.
What precedent does this EIA establish for other solar energy developers in Spain?
This resolution sets the level of environmental requirement that the General Directorate of Quality and Environmental Assessment applies to large-scale photovoltaic projects. The deficiencies identified in the alternatives study and the additional reports required on protected fauna indicate that developers of parks exceeding 50 MW in areas with sensitive species must strengthen their environmental studies from the design phase to avoid processing delays.
Official source
Consult complete regulation in official source
Disclaimer: 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-2026-13449