20 MW Battery Hybridized with Solar in Alcázar de San Juan: Keys for the Renewable Sector

Key data

A 47.19 MW solar plant in Alcázar de San Juan (Ciudad Real) takes a decisive step toward hybridization with storage: the Directorate General for Energy Policy and Mines has granted Ictio Solar Auriga, SL prior administrative authorization for the battery module "ALM Ictio Alcázar II", with 19.96 MW of installed capacity. The resolution, published on October 14, 2026, makes this installation a benchmark for the solar plus battery hybridization model that is gaining ground in Spain.

Processing began in November 2023 and has required multiple corrections until August 2026, illustrating the real administrative complexity of this type of project in the renewable energy sector.

What does this regulation establish?

The resolution grants prior administrative authorization —the first formal milestone in the process of enabling energy installations— for the battery storage module and its evacuation infrastructure. This authorization is not equivalent to construction permission: it is the prior step that enables the promoter to continue the process.

The key technical and administrative elements established by the resolution are as follows:

The fact that the environmental assessment was resolved through a simplified procedure is relevant: it implies that the project did not generate significant environmental impacts requiring an ordinary procedure, which speeds up overall timelines.

Economic and operational impact

For the promoter, this authorization represents the formal unblocking of a significant investment in energy storage. Adding 19.96 MW of battery capacity to a 47.19 MW solar plant allows optimization of the generation curve: storing surpluses during high irradiation hours and releasing them to the grid during periods of higher prices or demand.

From an operational perspective, hybridization with storage has direct implications:

• Greater control over the energy delivery profile, reducing dependence on spot prices during peak solar generation hours.
• Possibility of participating in system adjustment services (frequency regulation, balance), which generate additional income beyond energy sales.
• Optimization of the existing connection point at the Arenas de San Juan 220 kV substation, without the need for new high-voltage infrastructure.
• Processing of almost three years (November 2023 – October 2026), with multiple corrections: data that other promoters should consider when planning their project schedules.

For the renewable energy sector as a whole in Castilla-La Mancha, this resolution is a positive signal: it confirms that the administration is processing solar plus battery hybridization authorizations and that the simplified environmental impact procedure is viable for projects of this scale.

Who does it affect?

• Ictio Solar Auriga, SL: direct promoter, which must now demonstrate compliance with civil protection to obtain construction authorization.
• Promoters of photovoltaic plants in Spain studying hybridization of their installations with battery storage: this resolution is a relevant administrative precedent.
• Investors and renewable energy funds with positions in solar assets in Castilla-La Mancha or Spain in general.
• Legal and technical advisors specialized in processing energy installations: the file illustrates real timelines and the bodies consulted (Guadiana River Basin Authority, autonomous bodies).
• Red Eléctrica de España as manager of the Arenas de San Juan 220 kV substation, the evacuation point for the combined installation.
• Renewable energy sector in Castilla-La Mancha in general, given the reference effect that authorizations of this scale have.

Practical example

A promoter who, like Ictio Solar Auriga, has an operational photovoltaic plant of approximately 47 MW in Castilla-La Mancha and wants to add battery storage of about 20 MW should expect the following administrative path based on this file:

1. Start of processing: submission of prior administrative authorization request (in this case, November 2023).
2. Multiple corrections: the file required corrections until August 2026, which represents almost three years of active processing.
3. Simplified environmental assessment: if the project passes screening, the ordinary procedure is avoided, saving time.
4. Technical conditions: comply with requirements from the Guadiana River Basin Authority and corresponding autonomous bodies.
5. Prior administrative authorization: obtained in this case on October 14, 2026.
6. Next mandatory step: demonstrate compliance with civil protection and self-protection regulations to obtain construction authorization.

This real path —almost three years from application to prior authorization— is the most useful data for any promoter planning a similar project today.

What should companies do now?

1. If you are Ictio Solar Auriga or a promoter in an equivalent situation: demonstrate as soon as possible compliance with civil protection and self-protection regulations to unlock construction authorization, which is the next mandatory milestone.
2. If you are planning a solar plus battery hybridization project: incorporate into your schedule a minimum timeframe of two to three years for processing prior administrative authorization, based on the precedent of this file.
3. If you are an investor or fund with solar assets in Spain: evaluate the potential for hybridization with storage of your operating plants; this resolution confirms that the administrative path is open and that the simplified environmental impact procedure is applicable to projects of this scale.
4. If you are a technical or legal advisor: identify key advisory bodies for projects in Guadiana basins (Guadiana River Basin Authority) and prepare civil protection documentation from the start of the file to avoid late corrections.
5. If you operate in the renewable energy sector in Castilla-La Mancha: consult the full text of the resolution in the BOE to extract specific technical conditions applicable to your project.

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-2026-21433