64 MW Battery in Burgos: Solaria Obtains Authorization to Hybridize Its Solar Plant

Key data

Solaria Promoción y Desarrollo Fotovoltaico, SLU, has held since November 9, 2026 prior administrative authorization and construction authorization for the battery storage module "Agrupación Maira Alpha", with 64.44 MW of installed capacity. The authorization, granted by the General Directorate of Energy Policy and Mines through Resolution of October 22, 2026, enables the hybridization of this system with the homonymous photovoltaic solar installation of 165.278 MW located in Llano de Bureba (Burgos).

This type of authorization marks a relevant milestone in Spain's energy storage strategy: it allows an already operational photovoltaic plant to incorporate battery capacity to manage generation, reduce spillage, and improve supply firmness to the grid.

What does this regulation establish?

The resolution grants two simultaneous authorizations to Solaria for the "Agrupación Maira Alpha" battery module:

• Prior administrative authorization: recognizes the project's viability and compatibility with energy planning.
• Administrative construction authorization: allows physical commencement of works and installations.

The key technical elements of the project are as follows:

The project passed the simplified environmental impact assessment with a favorable result, subject to archaeological control measures, faunal prospecting, and plantings of native species. The Nuclear Safety Council (CSN) issued a favorable report with mandatory technical conditions.

Economic and operational impact

For Solaria, this authorization represents a decisive step in optimizing its photovoltaic asset in Burgos. Hybridization with batteries enables:

• Reduce energy spillage during hours of high solar generation and low demand, improving the plant's utilization factor.
• Participate in system adjustment service markets of the electrical system, where storage has increasing economic value.
• Improve delivery firmness to the grid, which can translate into better contractual conditions with traders and large consumers.

From the sector's perspective, the cumulative processing of the Maira Alpha, Beta, and Delta modules indicates that Solaria is developing a storage strategy at scale at this location, which could mean a total battery capacity significantly higher than the 64.44 MW of this specific module.

For the municipalities of Llano de Bureba and Los Barrios de Bureba, the project implies construction activity, local employment during the construction phase, and potential income from land leasing or agreements with the developer.

Who does it affect?

• Solaria Promoción y Desarrollo Fotovoltaico, SLU: direct beneficiary company of the authorization; must comply with the CSN's technical conditions and imposed environmental measures.
• Municipalities of Llano de Bureba and Los Barrios de Bureba (Burgos): territories where construction and installation works will be executed.
• Red Eléctrica de España (REE): manager of the transport network to which the project will connect at the Barcina 400 kV substation.
• Storage project developers in Spain: this resolution serves as a procedural reference for similar solar-battery hybridization projects.
• Battery installation and maintenance companies: potential contractors for the module's execution.
• Investors and renewable sector analysts: signal of progress in Solaria's storage portfolio on the Peninsula.

Practical example

Imagine that Solaria, with its "Agrupación Maira Alpha" photovoltaic plant of 165.278 MW, generates on a high irradiation day more energy than the grid can absorb at that moment. Without a battery, that energy is spilled (lost) or the plant must reduce production.

With the 64.44 MW battery now authorized, Solaria can store that surplus during the central hours of the day and release it to the grid during hours of higher prices or greater demand (afternoon-evening). This not only avoids economic losses from spillage, but also allows capturing the price differential between off-peak and peak hours in the wholesale electricity market.

Furthermore, by connecting via underground lines at 30 kV to the SE Llano 220/30 kV substation and from there to Barcina 400 kV, the system is integrated into the national transport network managed by REE, which opens the door to providing system regulation and balancing services.

What should companies do now?

1. If you are Solaria or a developer in a similar situation: verify full compliance with the Nuclear Safety Council's technical conditions, which are mandatory before and during construction.
2. Implement the required environmental measures: archaeological control, faunal prospecting, and plantings of native species are binding conditions of the authorization; non-compliance can compromise its validity.
3. Coordinate with REE the connection at Barcina 400 kV: the expansion of the SE Llano 220/30 kV substation must be executed according to the timelines agreed with the transport network operator.
4. Plan the processing of the Maira Beta and Delta modules: since they have been processed cumulatively, advances or conditions of Alpha may affect the timeline of the other two modules.
5. If you are a competitor or investor in the sector: analyze this resolution as a procedural reference for solar-battery hybridization projects in Spain; the requirements for simplified environmental assessment and CSN report are the applicable standards.

Official source

View complete regulation at official source

Disclaimer: This article is purely informational in nature 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-2026-23494