26.74 MW Battery Authorized in Cuenca: Key Insights for Solar Promoters

Key data

Renewable energy promoters have a clear signal on the table: hybridizing existing solar plants with batteries is now faster and more predictable than building new installations. The Resolution of May 31, 2026 from the General Directorate of Energy Policy and Mines grants Planta Solar OPDE 52, SL prior administrative authorization and construction authorization for the storage module «Hybridization OPDE Belinchón 2», of 26.74 MW, in Barajas de Melo (Cuenca).

The key is not just the authorization itself, but the path that has been followed to obtain it: the RD 997/2025 exempts storage hybridizations from simplified environmental assessment when they meet certain conditions, which has significantly accelerated the process. This makes this resolution a reference precedent for any promoter with photovoltaic plants in operation.

What does this regulation establish?

The resolution grants two simultaneous authorizations to Planta Solar OPDE 52, SL:

• Prior administrative authorization of the battery storage module «Hybridization OPDE Belinchón 2».
• Administrative construction authorization of the same module and its evacuation infrastructure.

The storage module, with 26.74 MW of installed capacity, will be hybridized with the photovoltaic plant «OPDE Belinchón 2», which already operates with 48.118 MW in Barajas de Melo (Cuenca). The evacuation infrastructure consists of an underground line at 30 kV that connects to the existing OPDE substation, leveraging previously authorized evacuation infrastructure up to the transmission network node at Belinchón 400 kV.

The most relevant regulatory element is the application of RD 997/2025, which under certain conditions exempts storage hybridizations from undergoing simplified environmental impact assessment. This exemption is what has allowed the processing to be notably accelerated. Additionally, Red Eléctrica de España updated access and connection permits in December 2024, which unblocked the final phase of the process.

Economic and operational impact

For the promoter, hybridizing an existing plant with storage has a direct operational impact: it allows shifting energy injection to hours of higher prices in the wholesale market, reducing spillage due to network constraints, and improving generation predictability. With 26.74 MW of battery on a plant of 48.118 MW, the storage-to-generation ratio exceeds 55%, providing significant energy management capacity.

From the perspective of the electrical system, this type of installation provides flexibility and stability to the grid, a service increasingly valued by the system operator. The regulatory acceleration provided by RD 997/2025 reduces processing timelines and costs for similar projects, which has a direct effect on investment profitability.

The use of already-authorized evacuation infrastructure—the 30 kV line and access to the Belinchón 400 kV node—eliminates the need to process new network authorizations, which is one of the most costly bottlenecks in time and money for greenfield projects.

Who does it affect?

• Renewable energy promoters with photovoltaic plants in operation that are evaluating adding storage.
• Investors and infrastructure funds with solar assets in their portfolio seeking to increase their value through hybridization.
• Advisors and consultants in the energy sector who process authorizations before the General Directorate of Energy Policy and Mines.
• Local and regional administrations in Cuenca and Castilla-La Mancha involved in energy territorial planning.
• Battery storage system manufacturers and integrators operating in the Spanish market.
• Red Eléctrica de España and other electrical system agents that manage access and connection to the transmission network.

Practical example

A promoter operating a photovoltaic plant with power similar to OPDE Belinchón 2—around 48 MW—and wanting to hybridize it with a 26 MW battery can now take this resolution as a roadmap. If their installation meets the assumptions of RD 997/2025—that is, the hybridization does not exceed certain thresholds that would trigger simplified environmental assessment and leverages already-authorized evacuation infrastructure—they can request prior and construction authorization simultaneously before the General Directorate of Energy Policy and Mines, without needing to initiate a separate environmental procedure.

In practice, this means the promoter avoids months of environmental processing and can move directly to the engineering and construction phase once authorization is obtained. The case of OPDE Belinchón 2 demonstrates that this path is viable and that Red Eléctrica de España can update access and connection permits—as it did in December 2024—to integrate the storage module within the existing framework.

What should companies do now?

1. Audit the portfolio of photovoltaic plants in operation to identify which ones have available evacuation capacity and could be hybridized with storage without needing new network authorizations.
2. Review whether the project meets the assumptions of RD 997/2025 that exempt from simplified environmental assessment, as this is the factor that most accelerates processing.
3. Verify the status of access and connection permits with Red Eléctrica de España, and request their update if necessary to include the storage module.
4. Prepare technical documentation for the request for prior administrative authorization and construction before the General Directorate of Energy Policy and Mines, taking this case as a reference structure.
5. Coordinate with the regional administration of Castilla-La Mancha or other autonomous communities depending on the project location, to align timelines and local requirements.
6. Evaluate the impact on the business model: calculate the income differential from hourly energy shifting and possible flexibility services that the battery can provide to the system operator.

Official source

Consult complete regulation at official source

Notice: 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-2026-13452