26.74 MW Battery Hybridized with Solar in Cuenca: Keys to the New Regulatory Framework

Key data

The renewable energy sector now has a concrete case that illustrates how the new simplified procedure for hybridizing storage with existing solar plants works. The General Directorate of Energy Policy and Mines has granted Planta Solar OPDE 51, SL prior administrative and construction authorization for the battery storage module called "Hibridación OPDE Belinchón 1", with 26.74 MW of installed capacity, in Barajas de Melo (Cuenca).

The resolution, published on June 20, 2026 in the BOE (BOE-A-2026-13451), is relevant not only for the project itself, but because it consolidates the use of RD 997/2025 as an agile route for renewable energy developers to add storage capacity to already-authorized installations.

What does this regulation establish?

The resolution grants two simultaneous authorizations to Planta Solar OPDE 51, SL:

• Prior administrative authorization of the battery storage module "Hibridación OPDE Belinchón 1".
• Administrative construction authorization of the same module and its evacuation infrastructure.

The project was processed under RD 997/2025, which establishes a specific simplified procedure for storage hybridizations with already-existing renewable installations. The key to this procedure is that, under certain circumstances, it exempts from environmental impact assessment, which drastically shortens administrative timelines.

The main technical elements of the project are as follows:

The evacuation infrastructure —underground line at 30 kV— connects to the already-authorized OPDE substation, which allows leveraging existing infrastructure and further simplifies processing. The project passed the public information procedure and obtained approval from the consulted bodies, with technical conditions from the Provincial Council of Cuenca and the Municipality of Barajas de Melo.

Economic and operational impact

For renewable energy developers, this resolution has a clear operational impact: it demonstrates that RD 997/2025 works in practice and that the simplified route is viable for storage hybridization projects of tens of megawatts.

The main economic and operational effects are:

• Timeline reduction: The exemption from environmental assessment under RD 997/2025 eliminates one of the longest phases of the authorization process, which can mean months of savings in processing time.
• Leveraging existing infrastructure: By connecting the battery to the already-authorized OPDE substation via a 30 kV underground line, additional investments in new evacuation infrastructure are avoided.
• Greater operational flexibility: A 26.74 MW battery hybridized with a 48.118 MW plant allows managing generated energy more efficiently, optimizing sales in the electricity market and reducing energy spillage.
• Legal certainty: Having prior administrative and construction authorization in a single resolution reduces regulatory uncertainty for project investors and financiers.

Who does it affect?

• Developers of photovoltaic solar plants who want to add battery storage to already-existing installations.
• Investors and energy infrastructure funds with exposure to renewable assets in Spain.
• Legal advisors and energy consultants who process hybridization authorizations under RD 997/2025.
• Energy storage sector companies (BESS system manufacturers and integrators) operating in the Spanish market.
• Local and provincial administrations (municipalities and provincial councils) in whose territory hybridization projects subject to technical conditions are located.

Practical example

A developer that has a photovoltaic plant with capacity similar to that of OPDE Belinchón 1 —around 48 MW— and wants to add a storage battery of approximately 26 MW can use the simplified procedure of RD 997/2025 if it meets the environmental exemption assumptions.

In this specific case, Planta Solar OPDE 51, SL has managed to process the authorization for a 26.74 MW battery connected via 30 kV underground line to an already-existing substation, avoiding the construction of new evacuation infrastructure and without the need for environmental impact assessment. The result: prior administrative and construction authorization obtained in a single resolution, with technical conditions from the Provincial Council of Cuenca and the Municipality of Barajas de Melo, but without the additional timelines that the ordinary procedure would have entailed.

This model is replicable for other developers with existing solar plants that have their own substation and meet the requirements of RD 997/2025.

What should companies do now?

1. Review whether your existing solar plant meets the assumptions of RD 997/2025 to use the simplified hybridization procedure with storage and avoid ordinary environmental assessment.
2. Evaluate available evacuation infrastructure: if you already have your own substation, connection via underground line can simplify and reduce project costs, as has occurred in the OPDE Belinchón 1 case.
3. Identify the bodies to consult in your municipality and province (municipality and provincial council), as they will issue technical conditions that must be integrated into the project.
4. Initiate the public information procedure as soon as possible, as it is a prerequisite for obtaining authorizations, even in the simplified procedure.
5. Consult with advisors specialized in energy regulation to verify that the design of the storage module and evacuation infrastructure comply with the technical requirements demanded by the General Directorate of Energy Policy and Mines.

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-2026-13451