26.74 MW Battery Hybridized with Solar in Zaragoza: Keys for Renewable Promoters

Key data

A battery storage module of 26.74 MW has just received prior administrative authorization and construction authorization to be hybridized with the photovoltaic solar park «Los Belos» (41.6 MW) in La Muela and Muel (Zaragoza). The Resolution of September 16, 2026, from the General Directorate of Energy Policy and Mines, published on October 20, 2026 in the BOE, is one of the first resolutions applying the simplified procedure of RD 997/2025 for storage hybridizations.

For renewable promoters, this case is a concrete roadmap: it demonstrates what documentation is required, what timelines are possible, and what evacuation infrastructure can be leveraged when a photovoltaic installation already exists and is operational.

What does this regulation establish?

The resolution grants two simultaneous authorizations to Planta Solar OPDE 3, SL:

• Prior administrative authorization: certifies the viability of the project from an energy and planning perspective.
• Administrative construction authorization: enables the physical start of works for the battery module and its evacuation infrastructure.

The differentiating element is the simplified procedure of RD 997/2025, designed specifically to expedite authorizations for storage hybridizations associated with already existing renewable installations. This procedure reduces administrative timelines compared to the ordinary process and, in this case, allowed environmental impact to be assessed as not significant, exempting the project from ordinary environmental impact assessment.

The key technical data of the authorized installation are as follows:

Economic and operational impact

Hybridizing storage with an existing solar plant has a direct operational and economic impact for the promoter:

• Optimization of existing infrastructure: by leveraging evacuation lines and the connection to the already installed Dalton substation, civil works costs are significantly reduced compared to a greenfield project.
• Reduction of administrative timelines: the simplified procedure of RD 997/2025 shortens the time between application and authorization, advancing the commissioning date and, with it, revenues from operation in the electricity market.
• Exemption from ordinary environmental impact assessment: eliminates one of the most costly bottlenecks in time and resources for storage projects.
• Improved generation profile: the 26.74 MW battery allows solar energy to be shifted to hours of higher prices, increasing average revenue per MWh generated.
• Market signal: this resolution confirms that the RD 997/2025 route is operational and replicable for other promoters with photovoltaic parks in operation who want to add storage.

Who does it affect?

• Renewable energy promoters with photovoltaic parks in operation studying the addition of battery storage.
• Investors and energy infrastructure funds with solar assets in Spain, especially in Aragón.
• Legal and technical advisors specialized in authorizations for energy installations.
• Public administrations in Aragón involved in processing energy projects in La Muela and Muel.
• Network operators and substation managers affected by the new connection to the Dalton 220/30 kV substation.
• Battery and storage sector companies that supply technology for this type of project.

Practical example

A promoter with a 40 MW photovoltaic park in operation in Aragón, connected to an existing substation, wants to add a 25 MW battery storage module. Following the precedent of «Hybridization Los Belos»:

1. Can use the simplified procedure of RD 997/2025, avoiding the ordinary authorization process.
2. If evacuation is carried out via underground lines to the already existing substation (as in the case of Dalton 220/30 kV), no new evacuation infrastructure needs to be built.
3. If environmental impact is assessed as not significant —as occurred in this case—, it is exempt from ordinary environmental impact assessment, saving between 12 and 24 months of processing in that specific procedure.
4. The result: two simultaneous authorizations (prior and construction) with reduced administrative timelines, and the possibility to start works sooner.

This is exactly the scheme that Planta Solar OPDE 3, SL has successfully executed for the «Hybridization Los Belos» module.

What should companies do now?

1. Review if your photovoltaic park is eligible for hybridization: check if the existing installation has available evacuation capacity at the connection substation and if current infrastructure can accommodate the battery module.
2. Analyze the applicability of RD 997/2025: verify if your project meets the requirements to use the simplified procedure, which is the route that has allowed this authorization to be expedited.
3. Commission a preliminary environmental impact study: exemption from ordinary assessment is not automatic; you must demonstrate to the administration that the impact is not significant. Do this as soon as possible to avoid blocking the file.
4. Coordinate with the network operator: confirm the availability of capacity at the planned evacuation substation (in this case, Dalton 220/30 kV) and request the access and connection point if you don't already have it.
5. Prepare technical and administrative documentation: the resolution requires both prior and construction authorization; ensure you submit both applications simultaneously to take advantage of the simplified procedure.
6. Monitor similar new resolutions: this case is a useful precedent for calibrating actual timelines and documentation required in similar projects in Aragón and other regions.

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-2026-21856