Key data
| Regulation | Resolution of July 20, 2026, from the General Directorate of Energy Policy and Mines |
|---|---|
| Publication | August 15, 2026 |
| Entry into force | August 15, 2026 |
| Promoter | GR Aitana Renovables, SLU |
| Location | Altarejos (Cuenca) |
| Storage module | 21.69 MW (batteries) |
| Existing solar plant (FV Aitana) | 49.11 MW installed capacity |
| Total hybrid capacity | 50 MW installed |
| Connection point | Villanueva de los Escuderos 400 kV Substation |
| Category | Energy |
| Year | 2026 |
The hybridization of solar plants with battery storage systems is one of the key vectors of Spanish energy policy to improve the manageability of the electrical system. The Resolution of July 20, 2026 from the General Directorate of Energy Policy and Mines materializes this approach: it authorizes GR Aitana Renovables, SLU to build a storage module of 21.69 MW that will be hybridized with the already operational photovoltaic plant FV Aitana, of 49.11 MW, forming a hybrid installation of 50 MW of installed capacity.
What does this regulation establish?
The resolution grants two simultaneous authorizations to GR Aitana Renovables, SLU:
- Prior administrative authorization: enables the promoter to develop the storage project.
- Administrative construction authorization: allows physical execution of the battery module works and its evacuation infrastructure.
The Aitana storage module will be hybridized with the existing photovoltaic solar installation "FV Aitana" and will share a connection point to the transmission grid at the Villanueva de los Escuderos substation at 400 kV.
The processing included a simplified environmental impact assessment with specific conditions that the promoter must respect. These conditions are binding and must be met before and during construction:
| Environmental condition | Detail |
|---|---|
| Permeable fencing for wildlife | The installation enclosure must allow the passage of wildlife |
| Herbicide prohibition | The use of herbicides is prohibited within the installation area |
| Prior botanical surveys | Must be conducted before construction begins and results submitted to the administration |
| Self-protection plan | Mandatory before the start of construction activity |
| Integrated environmental monitoring plan | The promoter must submit it to the administration before construction begins |
Economic and operational impact
The hybridization of a solar plant with battery storage has direct operational and economic consequences for the promoter and for the electrical system:
- Greater manageability: storage allows shifting generated energy to hours of higher demand or price, improving the promoter's revenues in the wholesale market.
- Optimization of the connection point: by sharing the evacuation substation (Villanueva de los Escuderos 400 kV) between the solar plant and storage, the need for a new grid access is avoided, reducing infrastructure costs.
- Compliance with environmental conditions: the requirements for permeable fencing, herbicide prohibition, and botanical surveys represent additional project costs that the promoter must budget before construction begins.
- Documentation submission timeline: the integrated environmental monitoring plan and botanical survey results must be delivered to the administration before construction begins, which conditions the construction schedule.
From the perspective of the electrical system, this authorization is part of the strategy of hybridizing renewables with storage to reduce the variability of solar generation and improve supply security.
Who does it affect?
- GR Aitana Renovables, SLU: direct promoter, holder of the authorizations and responsible for compliance with all conditions.
- Local administration of Altarejos (Cuenca): municipality where the installation is located, with implications for land planning and coordination with the self-protection plan.
- Promoters of solar plants with pending hybridization projects: this resolution establishes a procedural precedent (simplified environmental impact assessment with specific conditions) applicable to similar projects.
- Network operators and system managers: the new 50 MW hybrid installation connected at 400 kV affects transmission grid planning in the area.
- Renewable energy project consultants and advisors: must be aware of the environmental conditions required for solar-battery hybridization projects in Castilla-La Mancha.
Practical example
GR Aitana Renovables operates the FV Aitana solar plant, with 49.11 MW installed, already connected to the Villanueva de los Escuderos substation at 400 kV. Without storage, all generated energy must be fed to the grid at the moment of production, which limits the ability to optimize revenues in the electricity market.
With the addition of the 21.69 MW battery module now authorized, the hybrid installation will be able to store solar energy during peak production hours (midday) and discharge it during hours of higher market prices (afternoon-evening), improving the economic performance of the asset without needing to expand the grid connection point.
Before starting construction, the project team will have completed the botanical surveys of the affected land, submitted the integrated environmental monitoring plan and the self-protection plan, and ensured that the fencing design is permeable for wildlife. Non-compliance with any of these conditions could halt the start of construction.
What should companies do now?
- Review the construction schedule taking into account that submission of the integrated environmental monitoring plan and botanical survey results are prerequisites for construction to begin.
- Commission botanical surveys immediately, as they are a prerequisite that can extend the schedule if not planned in advance.
- Draft and submit the self-protection plan before construction begins, in accordance with the resolution's conditions.
- Verify the fencing design to ensure it is permeable for wildlife, as required by the simplified environmental impact assessment.
- Exclude herbicide use from all maintenance and construction contracts for the installation from day one.
- Coordinate with the local administration of Altarejos on urban planning and civil protection aspects derived from the self-protection plan.
- Promoters of similar projects: analyze this resolution as a procedural reference for solar-battery hybridization projects in processing, especially regarding the environmental conditions required.
Frequently asked questions
What capacity will the Aitana hybrid installation have after adding the battery?
The resulting hybrid installation will have an installed capacity of 50 MW. It consists of the FV Aitana photovoltaic solar plant (49.11 MW already existing) plus the new battery storage module of 21.69 MW, connected to the transmission grid at the Villanueva de los Escuderos substation at 400 kV.
What environmental conditions must GR Aitana Renovables comply with before starting construction?
Before construction begins, the promoter must: submit the integrated environmental monitoring plan, provide the results of prior botanical surveys, and have the self-protection plan in place. Additionally, the fencing design must be permeable for wildlife and herbicide use is prohibited throughout the installation.
What type of authorization has GR Aitana Renovables obtained?
The resolution of July 20, 2026 grants two simultaneous authorizations: the prior administrative authorization and the administrative construction authorization for the 21.69 MW Aitana storage module and its evacuation infrastructure.
Why was a simplified environmental impact assessment processed instead of an ordinary one?
The regulations provide for simplified environmental impact assessment for certain renewable hybridization projects. In this case, the resolution includes the conditions resulting from such assessment (permeable fencing, herbicide prohibition, botanical surveys, and self-protection plan), which are mandatory for the promoter to comply with.
What does this authorization imply for other promoters with solar-battery hybridization projects?
This resolution establishes a relevant procedural precedent: solar-battery hybridization projects in Spain can be processed with simplified environmental impact assessment, but with specific environmental conditions (fencing, herbicides, botany, self-protection) that must be integrated into the project design and schedule from the start.
Official source
Consult complete regulation in official source (BOE-A-2026-17823)
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-2026-17823